Methylidyne

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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.

Quantity Value Units Method Reference Comment
Δfgas142.00kcal/molReviewChase, 1998Data last reviewed in December, 1967
Quantity Value Units Method Reference Comment
gas,1 bar43.748cal/mol*KReviewChase, 1998Data last reviewed in December, 1967

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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Temperature (K) 298. to 1100.1100. to 6000.
A 7.8733517.206901
B -3.9939202.020821
C 5.780581-0.470756
D -1.8605910.036871
E -0.015583-1.190271
F 139.7300137.8320
G 54.1381050.03659
H 142.0000142.0000
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1967 Data last reviewed in December, 1967

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

(CHCl- • 4294967295Methylidyne) + Methylidyne = CHCl-

By formula: (CHCl- • 4294967295CH) + CH = CHCl-

Quantity Value Units Method Reference Comment
Δr37.7 ± 2.3kcal/molCIDTJesinger and Squires, 1999gas phase
Δr38.0 ± 2.0kcal/molN/AGilles, Ervin, et al., 1992gas phase; Triplet state is 4.2±2.5 kcal/mol higher in energy than neutral singlet

Carbon anion + Hydrogen cation = Methylidyne

By formula: C- + H+ = CH

Quantity Value Units Method Reference Comment
Δr365.54 ± 0.17kcal/molD-EAScheer, Bilodeau, et al., 1998gas phase; Given: 1.262119(20) eV
Quantity Value Units Method Reference Comment
Δr360.00 ± 0.27kcal/molH-TSScheer, Bilodeau, et al., 1998gas phase; Given: 1.262119(20) eV

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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]

Jesinger and Squires, 1999
Jesinger, R.A.; Squires, R.R., Carbyne thermochemistry from energy-resolved collision-induced dissociation. The heats of formation of CH, CF, and CCl, Int. J. Mass Spectrom., 1999, 187, 745-757, https://doi.org/10.1016/S1387-3806(98)14182-9 . [all data]

Gilles, Ervin, et al., 1992
Gilles, M.K.; Ervin, K.M.; Ho, J.; Lineberger, W.C., Negative Ion Photoelectron Spectroscopy of HCF-, HCCl-, HCBr-, and HCI- - Photoelectron Angular Distributions and Neutral Triplet Excitation, J. Phys. Chem., 1992, 96, 3, 1130, https://doi.org/10.1021/j100182a021 . [all data]

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]


Notes

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