C7 anion

Formula: C₇^-
Molecular weight: 84.0754
CAS Registry Number: 64886-38-0
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Gas phase thermochemistry data

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Data compiled by: John E. Bartmess

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	1015. ± 19.	kJ/mol	R-EA	Arnold, Bradforth, et al., 1991	Linear structure for both neutral and anion

Reaction thermochemistry data

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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

(C₇^- • 4294967295) + = C₇^-

By formula: (C₇^- • 4294967295C) + C = C₇^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	478. ± 31.	kJ/mol	N/A	Arnold, Bradforth, et al., 1991	gas phase; Linear structure for both neutral and anion

Ion clustering data

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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

(C₇^- • 4294967295) + = C₇^-

By formula: (C₇^- • 4294967295C) + C = C₇^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	478. ± 31.	kJ/mol	N/A	Arnold, Bradforth, et al., 1991	gas phase; Linear structure for both neutral and anion

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: ?

Energy (cm^-1)	Med.	References


T_d = 27090 ± 115	gas	Yang, Taylor, et al., 1988
		Arnold, Bradforth, et al., 1991

State: C

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 35231 ± 25	Ne	C-X	278	284	Forney, Grutter, et al., 1997

Vib. sym.	No.	cm^-1	Med.	Method	References


Σ_g⁺	3	491 ± 25	Ne	AB	Forney, Grutter, et al., 1997

State: B

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 20298	gas	B-X	447	493	Ohara, Shiromaru, et al., 1997
					Tulej, Kirkwood, et al., 1998
					Tulej, Kirkwood, et al., 1998, 2
T_o = 20314 ± 8	Ne	B-X	380	493	Forney, Grutter, et al., 1997

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


Σ_g⁺	1	Sym. stretch	2038	gas	MPD	Ohara, Shiromaru, et al., 1997 Tulej, Kirkwood, et al., 1998 Tulej, Kirkwood, et al., 1998, 2
	1	Sym. stretch	2058 ± 10	Ne	AB	Forney, Grutter, et al., 1997
	2		1569 ± 9	Ne	AB	Forney, Grutter, et al., 1997
	3		532	gas	MPD	Tulej, Kirkwood, et al., 1998 Tulej, Kirkwood, et al., 1998, 2
	3		575 ± 8	Ne	AB	Forney, Grutter, et al., 1997

State: A

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 15930	gas	A-X	496	627	Ohara, Shiromaru, et al., 1997
					Tulej, Kirkwood, et al., 1998
					Tulej, Kirkwood, et al., 1998, 2
					Lakin, Pachkov, et al., 2000
T_o = 15954 ± 5	Ne	A-X	495	627	Forney, Grutter, et al., 1997

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


Σ_g⁺	1	Sym. stretch	1870	gas	MPD	Ohara, Shiromaru, et al., 1997 Tulej, Kirkwood, et al., 1998 Tulej, Kirkwood, et al., 1998, 2 Lakin, Pachkov, et al., 2000
	1	Sym. stretch	1877 ± 6	Ne	AB	Forney, Grutter, et al., 1997
	2		1452	gas	MPD	Tulej, Kirkwood, et al., 1998 Tulej, Kirkwood, et al., 1998, 2 Lakin, Pachkov, et al., 2000
	2		1457 ± 5	Ne	AB	Forney, Grutter, et al., 1997
	3		543	gas	MPD	Ohara, Shiromaru, et al., 1997 Tulej, Kirkwood, et al., 1998 Tulej, Kirkwood, et al., 1998, 2 Lakin, Pachkov, et al., 2000
	3		562 ± 5	Ne	AB	Forney, Grutter, et al., 1997

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


Σ_u⁺	5	Asym. stretch	1736.4	Ne	IR	Freivogel, Grutter, et al., 1997
	5	Asym. stretch	1734.8	Ar	IR	Szczepanski, Ekern, et al., 1997 Szczepanski, Hodyss, et al., 1998

Additional references: Jacox, 1994, page 370; Jacox, 1998, page 329; Jacox, 2003, page 344

Notes

Energy separation between the v = 0 levels of the excited and electronic ground states.

Photodissociation threshold

References

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Arnold, Bradforth, et al., 1991
Arnold, D.W.; Bradforth, S.E.; Kitsopoulos, T.N.; Neumark, D.M., Vibrationally Resolved Spectra of C2-C11 by Anion Photoelectron Spectroscopy, J. Chem. Phys., 1991, 95, 12, 8753, https://doi.org/10.1063/1.461211 . [all data]

Yang, Taylor, et al., 1988
Yang, S.; Taylor, K.J.; Craycraft, M.J.; Conceicao, J.; Pettiette, C.L.; Cheshnovsky, O.; Smalley, R.E., UPS of 2--30-atom carbon clusters: Chains and rings, Chem. Phys. Lett., 1988, 144, 5-6, 431, https://doi.org/10.1016/0009-2614(88)87291-9 . [all data]

Forney, Grutter, et al., 1997
Forney, D.; Grutter, M.; Freivogel, P.; Maier, J.P., Electronic Absorption Spectra of Carbon Chain Anions (, J. Phys. Chem. A, 1997, 101, 29, 5292, https://doi.org/10.1021/jp970954k . [all data]

Ohara, Shiromaru, et al., 1997
Ohara, M.; Shiromaru, H.; Achiba, Y., Resonance-enhanced multiphoton electron detachment spectra of C[sub 7][sup -], C[sub 9][sup -], and C[sub 11][sup -], J. Chem. Phys., 1997, 106, 24, 9992, https://doi.org/10.1063/1.474074 . [all data]

Tulej, Kirkwood, et al., 1998
Tulej, M.; Kirkwood, D.A.; Maccaferri, G.; Dopfer, O.; Maier, J.P., Electronic spectra of linear carbon anions, Chem. Phys., 1998, 228, 1-3, 293, https://doi.org/10.1016/S0301-0104(97)00358-3 . [all data]

Tulej, Kirkwood, et al., 1998, 2
Tulej, M.; Kirkwood, D.A.; Pachkov, M.; Maier, J.P., Gas-Phase Electronic Transitions of Carbon Chain Anions Coinciding with Diffuse Interstellar Bands, Astrophys. J., 1998, 506, 1, L69, https://doi.org/10.1086/311637 . [all data]

Lakin, Pachkov, et al., 2000
Lakin, N.M.; Pachkov, M.; Tulej, M.; Maier, J.P.; Chambaud, G.; Rosmus, P., Theoretical and experimental study of the A[sup 2]Π[sub u]--X[sup 2]Π[sub g] band system of C[sub 7][sup -], J. Chem. Phys., 2000, 113, 21, 9586, https://doi.org/10.1063/1.1321768 . [all data]

Freivogel, Grutter, et al., 1997
Freivogel, P.; Grutter, M.; Forney, D.; Maier, J.P., Infrared bands of mass-selected carbon chains Cn (n = 8-12) and Cn- (n = 5-10, 12) in neon matrices, Chem. Phys., 1997, 216, 3, 401, https://doi.org/10.1016/S0301-0104(97)00038-4 . [all data]

Szczepanski, Ekern, et al., 1997
Szczepanski, J.; Ekern, S.; Vala, M., Vibrational Spectroscopy of Small Matrix-Isolated Linear Carbon Cluster Anions, J. Phys. Chem. A, 1997, 101, 10, 1841, https://doi.org/10.1021/jp963200z . [all data]

Szczepanski, Hodyss, et al., 1998
Szczepanski, J.; Hodyss, R.; Vala, M., Isotopic Infrared Absorption Study of C, J. Phys. Chem. A, 1998, 102, 43, 8300, https://doi.org/10.1021/jp982963e . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Notes

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Symbols used in this document:

Δ_fH°_gas Enthalpy of formation of gas at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions