Silylidyne


Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Δfgas90.024kcal/molReviewChase, 1998Data last reviewed in December, 1976
Quantity Value Units Method Reference Comment
gas,1 bar47.333cal/mol*KReviewChase, 1998Data last reviewed in December, 1976

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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View table.

Temperature (K) 298. to 1400.1400. to 6000.
A 5.6288929.030290
B 3.2061000.058574
C -0.645540-0.002209
D -0.1232280.004993
E 0.059737-1.137600
F 88.4103085.16511
G 53.5555955.76370
H 90.0245090.02450
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1976 Data last reviewed in December, 1976

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: John E. Bartmess

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

Si- + Hydrogen cation = Silylidyne

By formula: Si- + H+ = HSi

Quantity Value Units Method Reference Comment
Δr353.1 ± 2.7kcal/molD-EABlondel, Chaibi, et al., 2005gas phase; (28)Si: 1.3895213(13) eV; revised analysis of Blondel, Delsart, et al., 2001
Quantity Value Units Method Reference Comment
Δr347.9 ± 2.8kcal/molH-TSBlondel, Chaibi, et al., 2005gas phase; (28)Si: 1.3895213(13) eV; revised analysis of Blondel, Delsart, et al., 2001

(H2Si- • 4294967295Silylidyne) + Silylidyne = H2Si-

By formula: (H2Si- • 4294967295HSi) + HSi = H2Si-

Quantity Value Units Method Reference Comment
Δr83.4 ± 2.3kcal/molN/AKasdan, Herbst, et al., 1975gas phase

Gas phase ion energetics data

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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
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

View reactions leading to HSi+ (ion structure unspecified)

Electron affinity determinations

EA (eV) Method Reference Comment
1.2771 ± 0.0087LPESKasdan, Herbst, et al., 1975B

Ionization energy determinations

IE (eV) Method Reference Comment
7.89 ± 0.07ENDBoo and Armentrout, 1987LBLHLM
7.91 ± 0.01PIBerkowitz, Greene, et al., 1987LBLHLM
8.27 ± 0.06SCarslon, Copley, et al., 1980LLK
8.04DERHuber and Herzberg, 1979LLK
7.91SRao and Lakshman, 1971LLK
8.01 ± 0.08DERDouglas and Lutz, 1970RDSH

De-protonation reactions

Si- + Hydrogen cation = Silylidyne

By formula: Si- + H+ = HSi

Quantity Value Units Method Reference Comment
Δr353.1 ± 2.7kcal/molD-EABlondel, Chaibi, et al., 2005gas phase; (28)Si: 1.3895213(13) eV; revised analysis of Blondel, Delsart, et al., 2001; B
Quantity Value Units Method Reference Comment
Δr347.9 ± 2.8kcal/molH-TSBlondel, Chaibi, et al., 2005gas phase; (28)Si: 1.3895213(13) eV; revised analysis of Blondel, Delsart, et al., 2001; B

Ion clustering data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: John E. Bartmess

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

(H2Si- • 4294967295Silylidyne) + Silylidyne = H2Si-

By formula: (H2Si- • 4294967295HSi) + HSi = H2Si-

Quantity Value Units Method Reference Comment
Δr83.4 ± 2.3kcal/molN/AKasdan, Herbst, et al., 1975gas phase

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Blondel, Chaibi, et al., 2005
Blondel, C.; Chaibi, W.; Delsart, C.; Drag, C.; Goldfarb, F.; Kroger, S., The electron affinities of O, Si, and S revisited with the photodetachment microscope, Eur. Phys. J. D, 2005, 33, 3, 335-342, https://doi.org/10.1140/epjd/e2005-00069-9 . [all data]

Blondel, Delsart, et al., 2001
Blondel, C.; Delsart, C.; Goldfarb, F., Electron spectrometry at the mu eV level and the electron affinities of Si and F, J. Phys. B: Atom. Mol. Opt. Phys., 2001, 34, 9, L281-L288, https://doi.org/10.1088/0953-4075/34/9/101 . [all data]

Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C., Laser photoelectron spectrometry of the negative ions of silicon and its hydrides, J. Chem. Phys., 1975, 62, 541. [all data]

Boo and Armentrout, 1987
Boo, B.H.; Armentrout, P.B., Reaction of silicon ion (2P) with silane (SiH4, SiD4) heats of formation of SiHn, SiHn+ (n=1,2,3), and Si2Hn+ (n=0,1,2,3) remarkable isotope exchange reaction involving four hydrogen shifts, J. Am. Chem. Soc., 1987, 109, 3549. [all data]

Berkowitz, Greene, et al., 1987
Berkowitz, J.; Greene, J.P.; Cho, H.; Ruscic, B., Photoionization mass spectrometric studies of SiHn (n=1-4), J. Chem. Phys., 1987, 86, 1235. [all data]

Carslon, Copley, et al., 1980
Carslon, T.A.; Copley, J.; Duric, N.; Perman, N. -Elander; Larsson, M.; Lyyra, M., The oscillator strengths and the dissociation energy of SiH+ as determined from time resolved precision spectroscopy, Astron. Astrophys., 1980, 83, 238. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979, ,1. [all data]

Rao and Lakshman, 1971
Rao, T.V.R.; Lakshman, S.V.J., The true potential energy curves and Franck-Condon factors of SiH and SiH+ molecules, Physica, 1971, 56, 322. [all data]

Douglas and Lutz, 1970
Douglas, A.E.; Lutz, B.L., Spectroscopic identification of the SiH+ molecule: the A 1π-X1+ system, Can. J. Phys., 1970, 48, 247. [all data]


Notes

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