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Bad Calculated Bond Lengths

List of molecules with calculated bond lengths that differ by more than 0.050 Å from experimental bond lengths.

Calculated at CCSD/6-31+G**

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.217 3.132
C4H6 1-Methylcyclopropene rCH 1.087 3.427 2.340
C4H6 1-Methylcyclopropene rCC 1.476 2.261 0.785
CH3CH2SH ethanethiol rCH 1.095 1.831 0.736
S4 Sulfur tetramer rSS 2.155 2.891 0.736
C4H6 1-Methylcyclopropene rCH 1.087 1.822 0.735
CH3CH2SH ethanethiol rCH 1.095 1.827 0.732
C4H6 1-Methylcyclopropene rCH 1.098 1.775 0.677
C4H6 1-Methylcyclopropene rCH 1.098 1.762 0.664
ONNO NO dimer rNN 2.236 1.736 -0.500
S4 Sulfur tetramer rSS 2.155 2.599 0.444
C4H6 1-Methylcyclopropene rCH 1.070 1.511 0.441
C4H10O Methyl propyl ether rCC 1.530 1.093 -0.437
CH3CH2SH ethanethiol rCH 1.089 1.526 0.437
CH3CH2SH ethanethiol rCH 1.089 1.524 0.435
CH3CH2SH ethanethiol rCH 1.092 1.526 0.434
CH3CH2SH ethanethiol rCH 1.092 1.524 0.432
C4H6 1-Methylcyclopropene rCC 1.515 1.089 -0.426
C2H4F2 1,2-difluoroethane rCH 1.093 1.516 0.423
C2H4F2 1,2-difluoroethane rCH 1.093 1.505 0.412
CH2CHCH2F Allyl Fluoride rHC 1.130 1.500 0.370
CH2CHCH2F Allyl Fluoride rHC 1.130 1.496 0.366
C3H3NO Isoxazole rCH 1.075 1.430 0.355
Ar2 Argon diatomic rArAr 3.758 4.084 0.326
C4H10O Methyl propyl ether rCH 1.099 1.418 0.319
CH3CH2SH ethanethiol rCC 1.528 1.831 0.303
CH3CH2SH ethanethiol rCC 1.528 1.827 0.299
CH3CH2SH ethanethiol rCS 1.820 1.524 -0.296
CH3CH2SH ethanethiol rCS 1.820 1.526 -0.294
S4 Sulfur tetramer rSS 1.898 2.137 0.239
C2H2+ acetylene cation rCH 1.077 1.305 0.228
Si2H2 disilyne rSiSi 2.215 1.988 -0.228
C4H6 1-Methylcyclopropene rCC 1.300 1.514 0.214
Si2H2 disilyne rSiH 1.668 1.457 -0.211
Si2H2 disilyne rSiH 1.668 1.484 -0.184
S3 Sulfur trimer rSS 1.917 2.098 0.181
CaBr Calcium monobromide rCaBr 2.594 2.731 0.137
CaOH Calcium monohydroxide rOCa 1.976 2.113 0.137
CaC Calcium monocarbide rCCa 2.302 2.434 0.133
N2 Nitrogen diatomic rNN 1.098 1.224 0.126
N2 Nitrogen diatomic rNN 1.098 1.224 0.126
N2 Nitrogen diatomic rNN 1.213 1.113 -0.099
N2 Nitrogen diatomic rNN 1.213 1.113 -0.099
Si2H2 disilyne rSiSi 2.215 2.118 -0.097
Si2H2 disilyne rSiSi 2.215 2.123 -0.092
Na2 Sodium diatomic rNaNa 3.079 3.166 0.087
Na2 Sodium diatomic rNaNa 3.079 3.166 0.087
N2O4 Dinitrogen tetroxide rNN 1.782 1.702 -0.080
SiP Silicon monophosphide rSiP 2.078 1.999 -0.079
CaBr2 Calcium dibromide rCaBr 2.616 2.692 0.076
NaLi lithium sodium rLiNa 2.889 2.956 0.067
NaLi lithium sodium rLiNa 2.889 2.956 0.067
C2H2+ acetylene cation rCC 1.253 1.312 0.059
GeF Germanium monofluoride rFGe 1.745 1.801 0.056
HCF Fluoromethylene rCH 1.138 1.084 -0.054
HCF Fluoromethylene rCH 1.138 1.084 -0.054
GeH3F monofluorogermane rGeF 1.731 1.783 0.052
GaCl3 Gallium trichloride rClGa 2.180 2.129 -0.052
GeF4 Germanium tetrafluoride rFGe 1.670 1.720 0.050
59 molecules.