Dichloromethylene

• Formula: CCl₂
• Molecular weight: 82.917
• IUPAC Standard InChI: InChI=1S/CCl2/c2-1-3 Copy

  
• IUPAC Standard InChIKey: PFBUKDPBVNJDEW-UHFFFAOYSA-N Copy
• CAS Registry Number: 1605-72-7
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Information on this page:
  • Gas phase thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Vibrational and/or electronic energy levels
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to CCl₂⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Gas phase 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.

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

Wren, Vogelhuber, et al., 2009
Wren, S.W.; Vogelhuber, K.M.; Ervin, K.M.; Lineberger, W.C., The photoelectron spectrum of CCl2-: the convergence of theory and experiment after a decade of debate, Phys. Chem. Chem. Phys., 2009, 11, 23, 4745-4753, https://doi.org/10.1039/b822690c . [all data]

Born, Ingemann, et al., 2000
Born, M.; Ingemann, S.; Nibbering, N.M.M., Thermochemical properties of halogen-substituted methanes, methyl radicals, and carbenes in the gas phase, Int. J. Mass Spectrom., 2000, 194, 2-3, 103-113, https://doi.org/10.1016/S1387-3806(99)00125-6 . [all data]

Schwartz, Davico, et al., 1999
Schwartz, R.L.; Davico, G.E.; Ramond, T.M.; Lineberger, W.C., Singlet-triplet splittings in CX2 (X = F, Cl, Br, I) dihalocarbenes via negative ion photoelectron spectroscopy, J. Phys. Chem. A, 1999, 103, 41, 8213-8221, https://doi.org/10.1021/jp992214c . [all data]

Barden and Schaeffer, 2000
Barden, C.J.; Schaeffer, H.F., III, The Singlet-Triplet Energy Separation in Dichlorocarbene: a Surprising Difference Between Theory and Experiment, J. Chem. Phys., 2000, 112, 15, 6515-6516, https://doi.org/10.1063/1.481601 . [all data]

Dyke, Lee, et al., 2005
Dyke, J.M.; Lee, E.P.F.; Mok, D.K.W.; Chau, F.T., A combined ab initio/Franck-Condon study of the A-X single-vibronic-level emission spectrum of CCl2 and the photodetachment spectrum of CCl2-, ChemPhysChem, 2005, 6, 10, 2046-2059, https://doi.org/10.1002/cphc.200500194 . [all data]

Murray, Leopold, et al., 1988
Murray, K.K.; Leopold, D.G.; Miller, T.M.; Lineberger, W.C., Photoelectron Spectroscopy of the Halocarbene Anions HCF^-, HCCl^-, HCBr^-, HCI^-, CF₂^-, and CCl₂^-, J. Chem. Phys., 1988, 89, 9, 5442, https://doi.org/10.1063/1.455596 . [all data]

Dispert and Lacmann, 1978
Dispert, H.; Lacmann, K., Negative ion formation in collisions between potassium and fluoro- and chloromethanes: Electron affinities and bond dissociation energies, Int. J. Mass Spectrom. Ion Phys., 1978, 28, 49. [all data]

Scheunemann, Illenberger, et al., 1980
Scheunemann, H.U.; Illenberger, E.; Baumgartel, H., Dissociative electron attachment to CCl₄, CHCl₃, CH₂Cl₂, and CH₃Cl, Ber. Bunsen-Ges. Phys. Chem., 1980, 84, 580. [all data]

Kohn, Robles, et al., 1993
Kohn, D.W.; Robles, E.S.J.; Logan, C.F.; Chen, P., Photoelectron spectrum, ionization potential, and heat of formation of CCl₂, J. Phys. Chem., 1993, 97, 4936. [all data]

Shapiro and Lossing, 1968
Shapiro, J.S.; Lossing, F.P., Free radicals by mass spectrometry. XXXVII. The ionization potential and heat of formation of dichlorocarbene, J. Phys. Chem., 1968, 72, 1552. [all data]

Blanchard and LeGoff, 1957
Blanchard, L.P.; LeGoff, P., Mass spectrometric study of the species CS, SO, and CCl₂ produced in primary heterogeneous reactions, Can. J. Chem., 1957, 35, 89. [all data]

Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  EA	Electron affinity
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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