Accuracy

methylene, singlet     51 Methylene, singlet

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    #  Species Formula
    41 Pentaborane(11)H11B5
    42 B6H10 (Geo)H10B6
    43 Hexaborane(10)H10B6
    44 B10H14 (Geo)H14B10
    45 Decaborane(14)H14B10
    46 Carbon, cationC
    47 Carbon, atomC
    48 MethylidyneHC
    49 Methylene, singlet (Geo)CH2
    50 Methylene, triplet (Geo)CH2
    51 Methylene, singlet CH2
    52 Methylene, tripletCH2
    53 Methyl, cationCH3
    54 Methane (Geo)CH4
    55 MethaneCH4
    56 Methyl lithium (Geo)H3LiC
    57 Methyl lithiumH3LiC
    58 Carbon, dimer (Geo)C2
    59 AcetyleneC2H2
    60 Acetylene (Geo)C2H2
    61 Vinyl, cationC2H3


ΔHf: 99.8 kcal/mol,     REF: M. W. Chase, C. A. Davies, J. R. Downey, D. R. Frurip, R. A. McDonald, A. N. Syverud, JANAF Thermochemical Tables, Third Edition, J. Phys. Chem. Ref. Data 14, Suppl. 1 (1985).
  
 PM7
Methylene, singlet
 H=99.8 HR=JANAF86
  H     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.07327265 +1    0.0000000 +0    0.0000000 +0     1     0     0
  H     1.07329385 +1  112.0633276 +1    0.0000000 +0     2     1     0