Carbon anion

Formula: C^-
Molecular weight: 12.0112
IUPAC Standard InChI: InChI=1S/CH3/h1H3/q-1
IUPAC Standard InChIKey: LGRLWUINFJPLSH-UHFFFAOYSA-N
CAS Registry Number: 14337-00-9
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.
Species with the same structure:
- Methane ion
- Carbon anion
Information on this page:
Other data available:
- Gas phase ion energetics data
Options:
- Switch to calorie-based units

Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Ion clustering data, References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	595.1 ± 1.1	kJ/mol	Acid	Scheer, Bilodeau, et al., 1998	Given: 1.262119(20) eV; B
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	151.38	J/mol*K	Review	Chase, 1998	Data last reviewed in March, 1983

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Ion clustering data, References, Notes

Data compiled as indicated in comments:
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. 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

Carbon anion + =

By formula: C^- + H⁺ = CH

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1529.4 ± 0.71	kJ/mol	D-EA	Scheer, Bilodeau, et al., 1998	gas phase; Given: 1.262119(20) eV; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1506.2 ± 1.1	kJ/mol	H-TS	Scheer, Bilodeau, et al., 1998	gas phase; Given: 1.262119(20) eV; B

( Carbon anion • 2) + = ( • 3)

By formula: (C^- • 2C) + C = (C^- • 3C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	703. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 3) + = ( • 4)

By formula: (C^- • 3C) + C = (C^- • 4C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	630. ± 20.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • ) + = ( • 2)

By formula: (C^- • C) + C = (C^- • 2C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	628. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 4) + = ( • 5)

By formula: (C^- • 4C) + C = (C^- • 5C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	715.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 5) + = ( • 6)

By formula: (C^- • 5C) + C = (C^- • 6C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	649.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 6) + = ( • 7)

By formula: (C^- • 6C) + C = (C^- • 7C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	686.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 7) + = ( • 8)

By formula: (C^- • 7C) + C = (C^- • 8C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	657.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

( Carbon anion • 8) + = ( • 9)

By formula: (C^- • 8C) + C = (C^- • 9C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	665.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

Carbon anion + = ( • )

By formula: C^- + C = (C^- • C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	812. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering; M

Ion clustering data

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

Data compiled by: 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

Carbon anion + = ( • )

By formula: C^- + C = (C^- • C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	812. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • ) + = ( • 2)

By formula: (C^- • C) + C = (C^- • 2C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	628. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 2) + = ( • 3)

By formula: (C^- • 2C) + C = (C^- • 3C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	703. ± 8.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 3) + = ( • 4)

By formula: (C^- • 3C) + C = (C^- • 4C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	630. ± 20.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 4) + = ( • 5)

By formula: (C^- • 4C) + C = (C^- • 5C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	715.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 5) + = ( • 6)

By formula: (C^- • 5C) + C = (C^- • 6C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	649.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 6) + = ( • 7)

By formula: (C^- • 6C) + C = (C^- • 7C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	686.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 7) + = ( • 8)

By formula: (C^- • 7C) + C = (C^- • 8C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	657.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

( Carbon anion • 8) + = ( • 9)

By formula: (C^- • 8C) + C = (C^- • 9C)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	665.	kJ/mol	MS	Pargellis, 1990	gas phase; equilibrium cluster distributions from sputtering

References

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

Scheer, Bilodeau, et al., 1998
Scheer, M.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K., Systematic study of the stable states of C-, Si-, Ge-, and Sn- via infrared laser spectroscopy, Phys. Rev. A, 1998, 58, 4, 2844-2856, https://doi.org/10.1103/PhysRevA.58.2844 . [all data]

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

Pargellis, 1990
Pargellis, A.N., Estimating Carbon Cluster Binding Energies from Measured Cn Distributions, n <= 10, J. Chem. Phys., 1990, 93, 3, 2099, https://doi.org/10.1063/1.459035 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, References

Symbols used in this document:

S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.