1,3-Cyclopentadiene

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.


Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, 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:
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
Δfgas139.kJ/molChydRoth, Adamczak, et al., 1991ALS
Δfgas133.4kJ/molEqkFuruyama, Golden, et al., 1970ALS
Quantity Value Units Method Reference Comment
Δcgas-2960. ± 30.kJ/molCcbWassermann, 1935Corresponding Δfgas = 130. kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity Value Units Method Reference Comment
gas274.47J/mol*KN/AFuruyama S., 1970This a second law entropy value was obtained from study of gas-phase equilibrium. The value of S(298.2 K)=270.3(4.2) J/mol*K was obtained from other equilibrium study [ Grant C.J., 1969].; GT

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
33.2950.Dorofeeva O.V., 1986Recommended S(T) values differ from other statistically calculated values [ Turnbull A.G., 1967, Furuyama S., 1970] up to 2.6 J/mol*K. Discrepancies in Cp(T) values amount to 1.3-4.3 J/mol*K. There is an excellent agreement between selected values of S(T) and Cp(T) and those obtained by ab initio calculation [ Karni M., 1991].; GT
35.04100.
40.32150.
49.53200.
68.30273.15
75.4 ± 2.0298.15
75.89300.
103.30400.
126.45500.
145.03600.
160.04700.
172.41800.
182.77900.
191.551000.
199.041100.
205.471200.
211.001300.
215.771400.
219.921500.

Condensed phase thermochemistry data

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

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

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
liquid182.7J/mol*KN/ALebedev and Lityagov, 1977 

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
115.3298.15Lebedev and Lityagov, 1977T = 14 to 330 K.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, 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
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

cyclopentadienide anion + Hydrogen cation = 1,3-Cyclopentadiene

By formula: C5H5- + H+ = C5H6

Quantity Value Units Method Reference Comment
Δr1481. ± 9.2kJ/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1485. ± 12.kJ/molG+TSCumming and Kebarle, 1978gas phase; B
Δr1495. ± 8.4kJ/molD-EAEngelking and Lineberger, 1977gas phase; B
Quantity Value Units Method Reference Comment
Δr1455. ± 8.4kJ/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1459. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase; B

cyclopentadienide anion + 1,3-Cyclopentadiene = (cyclopentadienide anion • 1,3-Cyclopentadiene)

By formula: C5H5- + C5H6 = (C5H5- • C5H6)

Quantity Value Units Method Reference Comment
Δr<36.0kJ/molIMRBMeot-ner, 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr84.J/mol*KN/AMeot-ner, 1988gas phase; Entropy change calculated or estimated, DG<, ΔrH<; M
Quantity Value Units Method Reference Comment
Δr<11. ± 4.2kJ/molIMRBMeot-ner, 1988gas phase; B

Free energy of reaction

ΔrG° (kJ/mol) T (K) Method Reference Comment
15.250.PHPMSMeot-ner, 1988gas phase; Entropy change calculated or estimated, DG<, ΔrH<; M

Maleic anhydride + 1,3-Cyclopentadiene = Carbic anhydride

By formula: C4H2O3 + C5H6 = C9H8O3

Quantity Value Units Method Reference Comment
Δr-104. ± 2.kJ/molCmBreslauer and Kabakoff, 1974liquid phase; solvent: Dioxane; ALS
Δr-107.9kJ/molCmRogers and Quan, 1973liquid phase; Gas phase Diels-Alder; ALS

2Hydrogen + 1,3-Cyclopentadiene = Cyclopentane

By formula: 2H2 + C5H6 = C5H10

Quantity Value Units Method Reference Comment
Δr-210.8 ± 0.84kJ/molChydKistiakowsky, Ruhoff, et al., 1936gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -212.8 ± 0.84 kJ/mol; At 355 °K; ALS

Chlorine anion + 1,3-Cyclopentadiene = (Chlorine anion • 1,3-Cyclopentadiene)

By formula: Cl- + C5H6 = (Cl- • C5H6)

Quantity Value Units Method Reference Comment
Δr<10.5kJ/molTDEqFrench, Ikuta, et al., 1982gas phase; B

Free energy of reaction

ΔrG° (kJ/mol) T (K) Method Reference Comment
10.300.PHPMSFrench, Ikuta, et al., 1982gas phase; DG<; M

1,3-Cyclopentadiene + Tetracyanoethylene = Bicyclo[2.2.1]hept-5-ene-2,2,3,3-tetracarbonitrile

By formula: C5H6 + C6N4 = C11H6N4

Quantity Value Units Method Reference Comment
Δr-112.kJ/molKinSamuilov, Bukharov, et al., 1981liquid phase; solvent: Chorobenzene; ALS
Δr-106.9 ± 2.9kJ/molCmRogers, 1972liquid phase; ALS

2,5-Norbornadiene = 1,3-Cyclopentadiene + Acetylene

By formula: C7H8 = C5H6 + C2H2

Quantity Value Units Method Reference Comment
Δr117.2 ± 2.1kJ/molKinWalsh and Wells, 1975gas phase; Reanalyzed by Pedley, Naylor, et al., 1986, Original value = 118.7 ± 1.3 kJ/mol; ALS

21,3-Cyclopentadiene (l) + magnesium (cr) = Magnesium, bis(η(5)-2,4-cyclopentadien-1-yl)- (cr) + Hydrogen (g)

By formula: 2C5H6 (l) + Mg (cr) = C10H10Mg (cr) + H2 (g)

Quantity Value Units Method Reference Comment
Δr-142.5 ± 2.9kJ/molRSCHull, Reid, et al., 1967Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

C8H6MoO3 (solution) + 31,3-Diazine (solution) = C18H15MoN3O3 (solution) + 1,3-Cyclopentadiene (solution)

By formula: C8H6MoO3 (solution) + 3C4H4N2 (solution) = C18H15MoN3O3 (solution) + C5H6 (solution)

Quantity Value Units Method Reference Comment
Δr-69.9 ± 2.9kJ/molRSCNolan, Hoff, et al., 1985solvent: Pyridine; Reaction temperature: 323 K; MS

Bicyclo[2.1.0]pent-2-ene = 1,3-Cyclopentadiene

By formula: C5H6 = C5H6

Quantity Value Units Method Reference Comment
Δr-200. ± 2.kJ/molCisoRoth, Klarner, et al., 1980liquid phase; solvent: Heptane; ALS

Dicyclopentadiene = 21,3-Cyclopentadiene

By formula: C10H12 = 2C5H6

Quantity Value Units Method Reference Comment
Δr72.383kJ/molCmBaur and Frater, 1941gas phase; Heat of dissociation; ALS

2Hydrogen iodide + 1,3-Cyclopentadiene = Cyclopentene + Iodine

By formula: 2HI + C5H6 = C5H8 + I2

Quantity Value Units Method Reference Comment
Δr-89.5kJ/molEqkFuruyama, Golden, et al., 1970gas phase; ALS

2-Norbornene = 1,3-Cyclopentadiene + Ethylene

By formula: C7H10 = C5H6 + C2H4

Quantity Value Units Method Reference Comment
Δr97.2 ± 2.5kJ/molEqkWalsh and Wells, 1976gas phase; ALS

Bicyclo[2.2.1]hept-5-ene-2,2,3,3-tetracarbonitrile = 1,3-Cyclopentadiene + Tetracyanoethylene

By formula: C11H6N4 = C5H6 + C6N4

Quantity Value Units Method Reference Comment
Δr106.9 ± 2.9kJ/molCmRogers, 1972solid phase; ALS

1,3-Cyclopentadiene + Acetylene = 2,5-Norbornadiene

By formula: C5H6 + C2H2 = C7H8

Quantity Value Units Method Reference Comment
Δr-117. ± 2.kJ/molEqkWalsh and Wells, 1975gas phase; ALS

21,3-Cyclopentadiene = endo-Dicyclopentadiene

By formula: 2C5H6 = C10H12

Quantity Value Units Method Reference Comment
Δr-195.1kJ/molEqkLenz and Vaughan, 1989gas phase; ALS

21,3-Cyclopentadiene = C10H12

By formula: 2C5H6 = C10H12

Quantity Value Units Method Reference Comment
Δr-195.7kJ/molEqkLenz and Vaughan, 1989gas phase; ALS

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, 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
MM - Michael M. Meot-Ner (Mautner)
LL - Sharon G. Lias and Joel F. Liebman
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 C5H6+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)8.57 ± 0.01eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)821.6kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity798.4kJ/molN/AHunter and Lias, 1998HL

Proton affinity at 298K

Proton affinity (kJ/mol) Reference Comment
828.0Aue, Guidoni, et al., 2000Experimental literature data re-evaluated by the authors using ab initio protonation entropies; MM

Gas basicity at 298K

Gas basicity (review) (kJ/mol) Reference Comment
798.3Aue, Guidoni, et al., 2000Experimental literature data re-evaluated by the authors using ab initio protonation entropies; MM

Ionization energy determinations

IE (eV) Method Reference Comment
8.44PEKiselev, Sakhabutdinov, et al., 1992LL
8.58 ± 0.02PEBieri, Burger, et al., 1977LLK
8.56 ± 0.01EIHolmes and McGillivray, 1971LLK
8.57 ± 0.01PIDerrick, Asbrink, et al., 1971LLK
8.57 ± 0.01PIDemeo and El-Sayed, 1970RDSH
9.0EIHedaya, Kent, et al., 1968RDSH
8.55PIDewar and Worley, 1968RDSH
8.53PEKiselev, Sakhabutdinov, et al., 1992Vertical value; LL
8.61PEBock and Kaim, 1980Vertical value; LLK
8.6PECradock, Ebsworth, et al., 1975Vertical value; LLK
8.56PECradock, Findlay, et al., 1974Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C5H5+12.62HEIOccolowitz and White, 1968RDSH
C5H5+12.9HEIHarrison, Haynes, et al., 1965RDSH
C5H5+11.9 ± 0.5HEIDorman, 1965RDSH
C5H5+12.6HEIHarrison, Honnen, et al., 1960RDSH

De-protonation reactions

cyclopentadienide anion + Hydrogen cation = 1,3-Cyclopentadiene

By formula: C5H5- + H+ = C5H6

Quantity Value Units Method Reference Comment
Δr1481. ± 9.2kJ/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1485. ± 12.kJ/molG+TSCumming and Kebarle, 1978gas phase; B
Δr1495. ± 8.4kJ/molD-EAEngelking and Lineberger, 1977gas phase; B
Quantity Value Units Method Reference Comment
Δr1455. ± 8.4kJ/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1459. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase; B

References

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

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

Roth, Adamczak, et al., 1991
Roth, W.R.; Adamczak, O.; Breuckmann, R.; Lennartz, H.-W.; Boese, R., Die Berechnung von Resonanzenergien; das MM2ERW-Kraftfeld, Chem. Ber., 1991, 124, 2499-2521. [all data]

Furuyama, Golden, et al., 1970
Furuyama, S.; Golden, D.M.; Benson, S.W., Thermochemistry of cyclopentene and cyclopentadiene from studies of gas-phase equilibria, J. Chem. Thermodyn., 1970, 2, 161-169. [all data]

Wassermann, 1935
Wassermann, A., The mechanism of additions to double bonds. Part I. Thermochemistry and kinetics of a diene synthesis, J. Chem. Soc., 1935, 828-838. [all data]

Furuyama S., 1970
Furuyama S., Thermochemistry of cyclopentene and cyclopentadiene from studies of gas-phase equilibria, J. Chem. Thermodyn., 1970, 2, 161-169. [all data]

Grant C.J., 1969
Grant C.J., Reversibility in the gas-phase decomposition of cyclopentene. The entropy of cyclopentadiene, J. Chem. Soc. Chem. Comm., 1969, 667-668. [all data]

Dorofeeva O.V., 1986
Dorofeeva O.V., Thermodynamic properties of twenty-one monocyclic hydrocarbons, J. Phys. Chem. Ref. Data, 1986, 15, 437-464. [all data]

Turnbull A.G., 1967
Turnbull A.G., Thermochemistry of biscyclopentadienyl metal compounds, Austral. J. Chem., 1967, 20, 2059-2067. [all data]

Karni M., 1991
Karni M., Ab initio calculations and ideal gas thermodynamic functions of cyclopentadiene and cyclopentadiene derivatives, J. Phys. Chem. Ref. Data, 1991, 20, 665-683. [all data]

Lebedev and Lityagov, 1977
Lebedev, B.V.; Lityagov, V.Ya., Thermodynamics of polypentenamer synthesis reactions, Vysokomol. Soedin., 1977, B19, 558-560. [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P., Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A), Can. J. Chem., 1978, 56, 1. [all data]

Engelking and Lineberger, 1977
Engelking, P.C.; Lineberger, W.C., Laser photoelectron spectrometry of C5H5-: A determination of the electron affinity and Jahn-Teller coupling in cyclopentadienyl, J. Chem. Phys., 1977, 67, 1412. [all data]

Meot-ner, 1988
Meot-ner, M., The Ionic Hydrogen Bond and Solvation. 7. Interaction Energies of Carbanions with Solvent Molecules, J. Am. Chem. Soc., 1988, 110, 12, 3858, https://doi.org/10.1021/ja00220a022 . [all data]

Breslauer and Kabakoff, 1974
Breslauer, K.J.; Kabakoff, D.S., Enthalpy of the Diels-Alder reaction of cyclopentadiene and maleic anhydride, J. Org. Chem., 1974, 39, 721-722. [all data]

Rogers and Quan, 1973
Rogers, F.E.; Quan, S.W., Thermochemistry of the Diels-Alder reaction. III. Heat of addition of cyclopentadience to maleic anhydride, J. Phys. Chem., 1973, 77, 828-831. [all data]

Kistiakowsky, Ruhoff, et al., 1936
Kistiakowsky, G.B.; Ruhoff, J.R.; Smith, H.A.; Vaughan, W.E., Heats of organic reactions. IV. Hydrogenation of some dienes and of benzene, J. Am. Chem. Soc., 1936, 58, 146-153. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

French, Ikuta, et al., 1982
French, M.A.; Ikuta, S.; Kebarle, P., Hydrogen bonding of O-H and C-H hydrogen donors to Cl-. Results from mass spectrometric measurement of the ion-molecule equilibria RH + Cl- = RHCl-, Can. J. Chem., 1982, 60, 1907. [all data]

Samuilov, Bukharov, et al., 1981
Samuilov, Ya.D.; Bukharov, S.V.; Konovalov, A.I., Reactivity of tetraphenylcyclopentadiene and tetracyclone in the Diels-Alder reaction with cyanoethylenes, Zh. Org. Khim., 1981, 17, 2389-2393. [all data]

Rogers, 1972
Rogers, F.E., Thermochemistry of the Diels-Alder reactions. II. Heat of addition of several dienes to tetracyanoethylene, J. Phys. Chem., 1972, 76, 106-109. [all data]

Walsh and Wells, 1975
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, J. Chem. Thermodyn., 1975, 7, 149-154. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]

Hull, Reid, et al., 1967
Hull, H.S.; Reid, A.F.; Turnbull, A.G., Inorg. Chem., 1967, 6, 805. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Cox and Pilcher, 1970, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]

Nolan, Hoff, et al., 1985
Nolan, S.P.; Hoff, C.D.; Landrum, J.T., J. Organometal. Chem., 1985, 282, 357. [all data]

Roth, Klarner, et al., 1980
Roth, W.R.; Klarner, F.-G.; Lennartz, H.-W., Heats of hydrogenation. II. Heat of hydrogenation of bicyclo[2.1.0]pent-2-ene, an antiaromatic system, Chem. Ber., 1980, 113, 1806-1818. [all data]

Baur and Frater, 1941
Baur, E.; Frater, S., Kinetik der bildung und des zerfalls von dicyclopentadien, Helv. Chim. Acta, 1941, 24, 768-783. [all data]

Walsh and Wells, 1976
Walsh, R.; Wells, J.M., The enthalpy of formation and thermodynamic functions of bicyclo[2,2,1]hept-2-ene, J. Chem. Thermodyn., 1976, 8, 55-60. [all data]

Lenz and Vaughan, 1989
Lenz, T.G.; Vaughan, J.D., Employing force-field calculations to predict equilibrium constants and other thermodynamic properties for the dimerization of 1,3-cyclopentadiene, J. Phys. Chem., 1989, 93, 1592-1596. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Aue, Guidoni, et al., 2000
Aue, D.H.; Guidoni, M.; Betowski, L.D., Ab initio calculated gas-phase basicities of polynuclear aromatic hydrocarbons, Int. J. Mass Spectrom., 2000, 201, 283. [all data]

Kiselev, Sakhabutdinov, et al., 1992
Kiselev, V.D.; Sakhabutdinov, A.G.; Shakirov, I.M.; Zverev, V.V.; Konovalov, A.I., Bis reactants in Diels-Alder reactions. VII. Preparation and properties of polyadducts of reactions of bis(polymethylcyclopentadienes) and bis(maleimides), Zh. Org. Khim., 1992, 28, 2244. [all data]

Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P., Valence ionization enrgies of hydrocarbons, Helv. Chim. Acta, 1977, 60, 2213. [all data]

Holmes and McGillivray, 1971
Holmes, J.L.; McGillivray, D., The mass spectra of isomeric hydrocarbons-I: Norbornene and nortricyclene; The mechanisms and energetics of their fragmentations, Org. Mass Spectrom., 1971, 5, 1349. [all data]

Derrick, Asbrink, et al., 1971
Derrick, P.J.; Asbrink, L.; Edqvist, O.; Jonsson, B.-O.; Lindholm, E., Rydberg series in small molecules. XIII. Photoelectron spectroscopy and electronic structure of cyclopentadiene, Intern. J. Mass Spectrom. Ion Phys., 1971, 6, 203. [all data]

Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A., Ionization potential and structure of olefins, J. Chem. Phys., 1970, 52, 2622. [all data]

Hedaya, Kent, et al., 1968
Hedaya, E.; Kent, M.E.; McNeil, D.W.; Lossing, F.P.; McAllister, T., The thermal rearrangement of phenylnitrene to cyanocyclopentadiene, Tetrahedron Lett., 1968, 30, 3415. [all data]

Dewar and Worley, 1968
Dewar, M.J.S.; Worley, S.D., Ionization potential of cis-1,3-butadiene, J. Chem. Phys., 1968, 49, 2454. [all data]

Bock and Kaim, 1980
Bock, H.; Kaim, W., Radical ions. 37. Ionization and one-electron oxidation of electron-rich silylalkyl olefins, J. Am. Chem. Soc., 1980, 102, 4429. [all data]

Cradock, Ebsworth, et al., 1975
Cradock, S.; Ebsworth, E.A.V.; Moretto, H.; Rankin, D.W.H., Photoelectron spectra and fluxional behaviour in some σ-cyclopentadienes, J. Chem. Soc. Dalton Trans., 1975, 390. [all data]

Cradock, Findlay, et al., 1974
Cradock, S.; Findlay, R.H.; Palmer, M.H., Bonding in methyl- and silyl-cyclopentadiene compounds: a study by photoelectron spectroscopy ab initio molecular-orbital calculations, J. Chem. Soc. Dalton Trans., 1974, 1650. [all data]

Occolowitz and White, 1968
Occolowitz, J.L.; White, G.L., Energetic considerations in the assignment of some fragment ion structures, Australian J. Chem., 1968, 21, 997. [all data]

Harrison, Haynes, et al., 1965
Harrison, A.G.; Haynes, P.; McLean, S.; Meyer, F., The mass spectra of methyl-substituted cyclopentadienes, J. Am. Chem. Soc., 1965, 87, 5099. [all data]

Dorman, 1965
Dorman, F.H., Second differential ionization-efficiency curves for fragment ions by electron impact, J. Chem. Phys., 1965, 43, 3507. [all data]

Harrison, Honnen, et al., 1960
Harrison, A.G.; Honnen, L.R.; Dauben, H.J., Jr.; Lossing, F.P., Free radicals by mass spectrometry. XX. Ionization potentials of cyclopentadienyl and cycloheptatrienyl radicals, J. Am. Chem. Soc., 1960, 82, 5593. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References