Acetylene
- Formula: C2H2
- Molecular weight: 26.0373
- IUPAC Standard InChIKey: HSFWRNGVRCDJHI-UHFFFAOYSA-N
- CAS Registry Number: 74-86-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Ethyne; Ethine; Narcylen; C2H2; Acetylen; UN 1001; Vinylene
- Permanent link for this species. Use this link for bookmarking this species for future reference.
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Gas phase thermochemistry data
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 54.190 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1961 |
ΔfH°gas | 54.3 ± 0.2 | kcal/mol | Review | Manion, 2002 | adopted recommendation of Gurvich, Veyts, et al., 1991; DRB |
ΔfH°gas | 54.19 ± 0.19 | kcal/mol | Ccb | Wagman, Kilpatrick, et al., 1945 | Unpublished work of E. J. Prosen; ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 48.023 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1961 |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
7.015 | 100. | Gurvich, Veyts, et al., 1989 | p=1 bar.; GT |
8.501 | 200. | ||
10.53 | 298.15 | ||
10.56 | 300. | ||
12.04 | 400. | ||
13.09 | 500. | ||
13.89 | 600. | ||
14.57 | 700. | ||
15.18 | 800. | ||
15.73 | 900. | ||
16.24 | 1000. | ||
16.71 | 1100. | ||
17.13 | 1200. | ||
17.52 | 1300. | ||
17.87 | 1400. | ||
18.18 | 1500. | ||
18.47 | 1600. | ||
18.73 | 1700. | ||
18.96 | 1800. | ||
19.17 | 1900. | ||
19.36 | 2000. | ||
19.54 | 2100. | ||
19.70 | 2200. | ||
19.84 | 2300. | ||
19.98 | 2400. | ||
20.11 | 2500. | ||
20.22 | 2600. | ||
20.33 | 2700. | ||
20.43 | 2800. | ||
20.53 | 2900. | ||
20.62 | 3000. |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 298. to 1100. | 1100. to 6000. |
---|---|---|
A | 9.724420 | 16.12630 |
B | 9.735371 | 2.808581 |
C | -3.866731 | -0.483143 |
D | 0.877089 | 0.032551 |
E | -0.157364 | -2.343790 |
F | 50.36011 | 44.32481 |
G | 56.16759 | 60.59601 |
H | 54.19011 | 54.19011 |
Reference | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in March, 1961 | Data last reviewed in March, 1961 |
Phase change data
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 189. | K | N/A | Buckingham and Donaghy, 1982 | BS |
Tboil | 189.6 | K | N/A | Maass and Wright, 1921 | Uncertainty assigned by TRC = 0.3 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 171.65 | K | N/A | Morehouse and Maass, 1931 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 191.4 | K | N/A | Maass and Russell, 1918 | Uncertainty assigned by TRC = 1. K; TRC |
Tfus | 191.65 | K | N/A | McIntosh, 1907 | Uncertainty assigned by TRC = 0.5 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 192.4 | K | N/A | Clark and Din, 1950 | Uncertainty assigned by TRC = 0.5 K; TRC |
Ttriple | 191.35 | K | N/A | Maass and Wright, 1921 | Uncertainty assigned by TRC = 0.3 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ptriple | 1.2657 | atm | N/A | Clark and Din, 1950 | Uncertainty assigned by TRC = 0.0038 atm; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 308.3 ± 0.1 | K | N/A | Tsonopoulos and Ambrose, 1996 | |
Tc | 308.35 | K | N/A | Goloborod'ko and Khodeeva, 1972 | Visual, as Goloborod'ko and Khodeeva Zh.Fiz.Khim. 1969,43,1340; TRC |
Tc | 308.66 | K | N/A | Khodeeva, 1966 | TRC |
Tc | 309.7 | K | N/A | Maass and Wright, 1921 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 60.58 ± 0.099 | atm | N/A | Tsonopoulos and Ambrose, 1996 | |
Quantity | Value | Units | Method | Reference | Comment |
Vc | 0.1122 | l/mol | N/A | Tsonopoulos and Ambrose, 1996 | |
Vc | 0.113 | l/mol | N/A | Khodeeva, 1966 | Visual, samples thoroughly purified; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 8.91 ± 0.010 | mol/l | N/A | Tsonopoulos and Ambrose, 1996 |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
3.90 | 273. | A | Stephenson and Malanowski, 1987 | Based on data from 258. to 308. K.; AC |
3.99 | 207. | A | Stephenson and Malanowski, 1987 | Based on data from 192. to 308. K.; AC |
3.99 | 210. | A | Stephenson and Malanowski, 1987 | Based on data from 192. to 225. K.; AC |
4.06 | 214. | N/A | Reid, 1972 | AC |
3.92 | 230. | N/A | Ambrose and Townsend, 1964 | Based on data from 215. to 308. K.; AC |
4.02 | 200. | N/A | Ambrose, 1956 | Based on data from 193. to 207. K. See also Boublik, Fried, et al., 1984.; AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
214.64 to 308.33 | 4.65570 | 909.079 | 7.947 | Ambrose and Townsend, 1964, 2 | Coefficents calculated by NIST from author's data. |
192.59 to 206.30 | 4.19027 | 699.53 | -21.47 | Ambrose, 1956, 2 | Coefficents calculated by NIST from author's data. |
Enthalpy of sublimation
ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
5.62 | 130. | A | Stephenson and Malanowski, 1987 | Based on data from 98. to 145. K.; AC |
5.21 | 162. | N/A | Jones, 1960 | Based on data from 133. to 191. K.; AC |
6.02 | 193. | N/A | Ambrose, 1956 | Based on data from 151. to 193. K.; AC |
5.43 | 160. | A | Stull, 1947 | Based on data from 130. to 189. K.; AC |
5.28 | 129. | A | Burbo, 1943 | Based on data from 89. to 169. K.; AC |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.899 | 192.4 | Miskiewicz, Rieser, et al., 2010 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
4.25 | 142.7 | Miskiewicz, Rieser, et al., 1976 | CAL |
4.66 | 192.4 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
C2H- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 379. ± 5. | kcal/mol | AVG | N/A | Average of 8 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 370. ± 5. | kcal/mol | AVG | N/A | Average of 7 values; Individual data points |
By formula: COS+ + C2H2 = (COS+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 27.7 | kcal/mol | PD/KERD | Graul S.T. and Bowers, 1991 | gas phase; ΔrH>=; M |
ΔrH° | 34. | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; M |
ΔrH° | 34. | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; M |
ΔrH° | 33.7 ± 5.3 | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; ΔrH<; M |
By formula: Co+ + C2H2 = (Co+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 43.0 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
6.5 (+3.1,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH >=, guided ion beam CID; M |
By formula: Ni+ + C2H2 = (Ni+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 44.9 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
1.7 (+4.3,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH>=, guided ion beam CID; M |
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -74.58 ± 0.15 | kcal/mol | Chyd | Conn, Kistiakowsky, et al., 1939 | gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -75.06 ± 0.66 kcal/mol; At 355 K; ALS |
By formula: C7H8 = C5H6 + C2H2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 28.00 ± 0.50 | kcal/mol | Kin | Walsh and Wells, 1975 | gas phase; Reanalyzed by Pedley, Naylor, et al., 1986, Original value = 28.36 ± 0.32 kcal/mol; ALS |
C2Na2 (cr) + 2 (l) = 2(
• 1418
) (solution) +
(g)
By formula: C2Na2 (cr) + 2H2O (l) = 2(HNaO • 1418H2O) (solution) + C2H2 (g)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -38.67 ± 0.36 | kcal/mol | RSC | Johnson, van Deventer, et al., 1973 | Please also see Pedley and Rylance, 1977.; MS |
C2HCs (cr) + (l) = (
• 1031
) (solution) +
(g)
By formula: C2HCs (cr) + H2O (l) = (HCsO • 1031H2O) (solution) + C2H2 (g)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -12.9 ± 0.2 | kcal/mol | RSC | Ader and Hubbard, 1973 | Please also see Pedley and Rylance, 1977.; MS |
C2HNa (cr) + (l) = (
• 1418
) (solution) +
(g)
By formula: C2HNa (cr) + H2O (l) = (HNaO • 1418H2O) (solution) + C2H2 (g)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -13.0 ± 0.2 | kcal/mol | RSC | Johnson, van Deventer, et al., 1973 | Please also see Pedley and Rylance, 1977.; MS |
By formula: Cu+ + C2H2 = (Cu+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
2.4 (+2.4,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH>=, guided ion beam CID; M |
By formula: 2C2H2 = C4H4
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 55.8 | kcal/mol | Cm | Reppe, Schlichting, et al., 1948 | liquid phase; ALS |
ΔrH° | 49.6 | kcal/mol | Cm | Reppe, Schlichting, et al., 1948 | gas phase; ALS |
By formula: Rh+ + C2H2 = (Rh+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
30.9 | CID | Chen and Armetrout, 1995 | gas phase; ΔrH>=, guided ion beam CID; M |
By formula: Cr+ + C2H2 = (Cr+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
44.0 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Ti+ + C2H2 = (Ti+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
60.5 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: La+ + C2H2 = (La+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
62.6 (+7.2,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Sc+ + C2H2 = (Sc+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
57.4 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: V+ + C2H2 = (V+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
49.0 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Y+ + C2H2 = (Y+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
60.5 (+7.2,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
+
= C2H2Br-
By formula: Br- + C2H2 = C2H2Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 8.60 | kcal/mol | LPES | Wild, Milley, et al., 2000 | gas phase; Given: 8.635±0.009 kcal/mol(0 K); B |
C2Ag2 (cr) + 2( • 12.3
) (solution) =
(aq) + 2
(cr)
By formula: C2Ag2 (cr) + 2(HCl • 12.3H2O) (solution) = C2H2 (aq) + 2AgCl (cr)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -18.6 ± 0.1 | kcal/mol | RSC | Finch, Gardner, et al., 1991 | MS |
(CAS Reg. No. 25012-81-1 • 4294967295) +
= CAS Reg. No. 25012-81-1
By formula: (CAS Reg. No. 25012-81-1 • 4294967295C2H2) + C2H2 = CAS Reg. No. 25012-81-1
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 33.02 ± 0.72 | kcal/mol | N/A | Ervin, Gronert, et al., 1990 | gas phase; B |
By formula: Al+ + C2H2 = (Al+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.0 ± 2.0 | kcal/mol | CIDC,EqG | Stockigt, Schwarz, et al., 1996 | Anchored to theory; RCD |
By formula: C2H2Cl2 = C2H2 + Cl2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 5.1 | kcal/mol | Kin | Laursen and Pimentel, 1989 | gas phase; Photolyses; ALS |
By formula: C2H3Cl = C2H2 + HCl
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 24.06 ± 0.28 | kcal/mol | Cm | Lacher, Gottlieb, et al., 1962 | gas phase; ALS |
By formula: C5H6 + C2H2 = C7H8
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -28.0 ± 0.5 | kcal/mol | Eqk | Walsh and Wells, 1975 | gas phase; ALS |
By formula: C2H2+ + C2H2 = (C2H2+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 22.6 | kcal/mol | PI | Ono and Ng, 1982 | gas phase; M |
By formula: Fe+ + C2H2 = (Fe+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 36.1 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
By formula: C2H2I2 = C2H2 + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19.9 | kcal/mol | Eqk | Furuyama, Golden, et al., 1968 | gas phase; ALS |
C2H2I2 = +
By formula: C2H2I2 = C2H2 + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19.9 | kcal/mol | Eqk | Furuyama, Golden, et al., 1968 | gas phase; ALS |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
Data compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman
View reactions leading to C2H2+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 11.400 ± 0.002 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 153.3 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 147.4 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
Appearance energy determinations
De-protonation reactions
C2H- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 379. ± 5. | kcal/mol | AVG | N/A | Average of 8 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 370. ± 5. | kcal/mol | AVG | N/A | Average of 7 values; Individual data points |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
RCD - Robert C. Dunbar
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
By formula: Al+ + C2H2 = (Al+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.0 ± 2.0 | kcal/mol | CIDC,EqG | Stockigt, Schwarz, et al., 1996 | Anchored to theory; RCD |
+
= C2H2Br-
By formula: Br- + C2H2 = C2H2Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 8.60 | kcal/mol | LPES | Wild, Milley, et al., 2000 | gas phase; Given: 8.635±0.009 kcal/mol(0 K); B |
By formula: COS+ + C2H2 = (COS+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 27.7 | kcal/mol | PD/KERD | Graul S.T. and Bowers, 1991 | gas phase; ΔrH>=; M |
ΔrH° | 34. | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; M |
ΔrH° | 34. | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; M |
ΔrH° | 33.7 ± 5.3 | kcal/mol | PDiss | Orlando, Friedman, et al., 1990 | gas phase; ΔrH<; M |
By formula: C2H2+ + C2H2 = (C2H2+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 22.6 | kcal/mol | PI | Ono and Ng, 1982 | gas phase; M |
By formula: Co+ + C2H2 = (Co+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 43.0 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
6.5 (+3.1,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH >=, guided ion beam CID; M |
By formula: Cr+ + C2H2 = (Cr+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
44.0 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Cu+ + C2H2 = (Cu+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
2.4 (+2.4,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH>=, guided ion beam CID; M |
By formula: Fe+ + C2H2 = (Fe+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 36.1 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
By formula: La+ + C2H2 = (La+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
62.6 (+7.2,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Ni+ + C2H2 = (Ni+ • C2H2)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 44.9 ± 1.9 | kcal/mol | IRMPD | Surya, Ranatunga, et al., 1997 | RCD |
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
1.7 (+4.3,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; ΔrH>=, guided ion beam CID; M |
By formula: Rh+ + C2H2 = (Rh+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
30.9 | CID | Chen and Armetrout, 1995 | gas phase; ΔrH>=, guided ion beam CID; M |
By formula: Sc+ + C2H2 = (Sc+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
57.4 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Ti+ + C2H2 = (Ti+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
60.5 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: V+ + C2H2 = (V+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
49.0 (+4.8,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
By formula: Y+ + C2H2 = (Y+ • C2H2)
Enthalpy of reaction
ΔrH° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
60.5 (+7.2,-0.) | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID; M |
IR Spectrum
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes
Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
References
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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Vapour pressure of acetylene,
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The vapour pressures and critical temperatures of acetylene and carbon dioxide,
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Vapour Pressure of Acetylene,
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Ambrose, 1956, 2
Ambrose, D.,
The Vapour Pressures and Critical Temperatures of Acetylene and Carbon Dioxide,
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Walsh, R.; Wells, J.M.,
The enthalpy of formation of bicyclo[2,2,1]hepta-2,5-diene. Thermodynamic functions of bicyclo[2,2,1]heptane and bicyclo[2,2,1]hepta-2,5-diene,
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Johnson, G.K.; van Deventer, E.H.; Ackerman, J.P.; Hubbard, W.N.; Osborne, D.W.; Flotow, H.L.,
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Pedley and Rylance, 1977
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Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]
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Ader, M.; Hubbard, W.N.,
J. Chem. Thermodyn., 1973, 5, 607. [all data]
Reppe, Schlichting, et al., 1948
Reppe, W.; Schlichting, O.; Klager, K.; Toepel, T.,
Cyclisierende Polymerisation von Acetylen I Uber Cyclooctatetraen,
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Chen and Armetrout, 1995
Chen, Y.M.; Armetrout, P.B.,
Activation of C2H6, C3H8, and c-C3H6 by Gas-Phase Rh+ and the Thermochemistry of Rh-Ligand Complexes,
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Wild, Milley, et al., 2000
Wild, D.A.; Milley, P.J.; Loh, Z.M.; Wolynec, P.P.; Weiser, P.S.; Bieske, E.J.,
Structural and Energetic Properties of the Br--C2H2 Anion Complex from Rotationally Resolved Mid-infrared Spectra And ab initio Calculations,
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Stockigt, Schwarz, et al., 1996
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Reaction heats of organic compounds. Part 2.-Heat of addition of hydrogen chloride to acetylene,
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Ono, Y.; Ng, C.Y.,
A Study of the Unimolecular Decomposition of the (C2H2)2+ Complex,
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Furuyama, Golden, et al., 1968
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Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
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Electroionization study of acetylene and fragment ions,
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Hayaishi, Iwata, et al., 1982
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Fluorine and the fluoroderivatives of acetylene and diacetylene studied by 30.4 nm He(II) photoelectron spectroscopy,
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Suzuki and Maeda, 1978
Suzuki, I.H.; Maeda, K.,
Ionization efficiency curves of acetylene by mono-energetic electron impact,
Adv. Mass Spectrom., 1978, 7, 182. [all data]
Suzuki and Maeda, 1977
Suzuki, I.H.; Maeda, K.,
Ionization efficiency curves of acetylene by electron impact,
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Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P.,
Valence ionization enrgies of hydrocarbons,
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Van Veen, E.H.; Plantenga, F.L.,
Low-energy electron-impact excitation spectra of acetylene,
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Reeher, J.R.; Flesch, G.D.; Svec, H.J.,
The mass spectra and ionization potentials of the neutral fragments produced during the electron bombardment of aromatic compounds,
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Spectres de photoelectrons des alcynes,
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A photoionization mass spectrometer utilizing a high intensity molecular beam sampling system and synchrotron radiation,
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Photoionization of acetylene near threshold,
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Brogli, F.; Heilbronner, E.; Hornung, V.; Kloster-Jensen, E.,
230. Die photoelektronen-spektren methyl-substituierter Acetylene,
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Lossing, 1970
Lossing, F.P.,
Threshold ionization of acetylene by monoenergetic electron impact,
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Omura, Kaneko, et al., 1969
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Ionization potentials of molecules and free radicals and appearance potentials by electron impact in the mass spectrometer,
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Fine structure in energy-distribution-difference ionizationefficiency curves,
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High resolution molecular photoelectron spectroscopy. III.Acetylenes and azaacetylenes,
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Brehm, B.,
Massenspektrometrische Untersuchung der Photoionisation von Molekulen,
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Nicholson, 1965
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Photoionization-efficiency curves. II. False and genuine structure,
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Melton and Hamill, 1964
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Appearance potentials by the retarding potential-difference method for secondary ions produced by excited-neutral, excited ion-neutral, and ion-neutral reactions,
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Dibeler and Reese, 1964
Dibeler, V.H.; Reese, R.M.,
Mass spectrometric study of photoionization. I. Apparatus and initial observations on acetylene, acetylene-d2, benzene, and benzene-d6,
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Ionization potential of propyne,
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Kusch, P.; Hustrulid, A.; Tate, J.T.,
The dissociation of HCN, C2H2, C2N2 and C2H4 by electron impact,
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Price, 1935
Price, W.C.,
The absorption spectra of acetylene, ethylene, and ethane in the far ultraviolet,
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30.4-nm He(II) photoelectron spectra of organic molecules,
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Cavell and Allison, 1978
Cavell, R.G.; Allison, D.A.,
Photoelectron spectra of acetylene with He(I), He(II) , Zr M175»{zeta}, MgK»α radiation sources,
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Absolute dipole oscillator strengths for photoabsorption and the molecular and dissociative photoionization of acetylene,
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Bloch, 1963
Bloch, A.,
Mass spectra of acetylene under high pressure in the ion source,
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Davister, M.; Locht, R.,
The dissociative ionization of C2H2 and C2D2. The [CH(CD)]+ dissociation channel. The H(D)C≡C(D)H binding energy,
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Kloster-Jensen, Pascual, et al., 1970
Kloster-Jensen, E.; Pascual, C.; Vogt, J.,
Mass spectrometric studies of mono- and di-haloacetylenes,,
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Haney and Franklin, 1968
Haney, M.A.; Franklin, J.L.,
Correlation of excess energies of electron-impact dissociations with the translational energies of the products,
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Franklin and Munson, 1965
Franklin, J.L.; Munson, M.S.B.,
Ion-molecule reactions in methane-oxygen and acetylene-oxygen systems,
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Reid, C.J.; Ballantine, J.A.; Andrews, S.R.; Harris, F.M.,
Charge inversion of ground-state and metastable-state C2+ cations formed from electroionised C2H2 and C2N2, and a re-evaluation of the carbon dimer's ionisation energy,
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Momigny, J.; Derouane, E.,
Fine structure in the first derivative of ionization curves obtained under electron impact,
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Field, F.H.; Franklin, J.L.; Lampe, F.W.,
Reactions of gaseous ions. II. Acetylene,
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Coats and Anderson, 1957
Coats, F.H.; Anderson, R.C.,
Thermodynamic data from electron-impact measurements on acetylene and substituted acetylenes,
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The appearance energy of C2H+ from C2H2 revisited. A photoion-photoelectron coincidence spectroscopic determination,
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The dissociative electroionization of C2H2, C2D2 and C2HD. Investigation of the [C2H(D)]+ and [H(D)]+ dissociation channels. The (D)H-C2H(D) binding energy,
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A state-selected study of the unimolecular decompoisition of C2H2+(A,B) using the photoion photoelectron coincidence method,
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Ono, Y.; Ng, C.Y.,
The heat of formation of C2H+,
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Eland, J.H.D.,
Dissociations of state-selected C2H2+, H2S+ and D2S+ ions studied by photoelectron-photoion coincidence spectroscopy,
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Dibeler, Walker, et al., 1973
Dibeler, V.H.; Walker, J.A.; McCulloh, K.E.,
Observations on hot bands in the molecular and dissociative photoionization of acetylene and the heat of formation of the ethynyl ion,
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Botter, Dibeler, et al., 1966
Botter, R.; Dibeler, V.H.; Walker, J.A.; Rosenstock, H.M.,
Experimental and theoretical studies of photoionization-efficiency curves for C2H2 and C2D2,
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Shiromaru, Achiba, et al., 1987
Shiromaru, H.; Achiba, Y.; Kimura, K.; Lee, Y.T.,
Determination of the C-H bond dissociation energies of ethylene and acetylene by observation of the threshold energies of H+ formation by synchrotron radiation,
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Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas IE (evaluated) Recommended ionization energy Pc Critical pressure Ptriple Triple point pressure S°gas,1 bar Entropy of gas at standard conditions (1 bar) T Temperature Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature Vc Critical volume ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔsubH Enthalpy of sublimation ΔvapH Enthalpy of vaporization ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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