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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 MP2/daug-cc-pVDZ

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.252 3.167
C4H6 1-Methylcyclopropene rCH 1.087 3.444 2.357
C4H6 1-Methylcyclopropene rCC 1.476 2.276 0.800
C4H6 1-Methylcyclopropene rCH 1.087 1.845 0.758
CH3CH2SH ethanethiol rCH 1.095 1.842 0.747
CH3CH2SH ethanethiol rCH 1.095 1.839 0.744
S4 Sulfur tetramer rSS 2.155 2.899 0.744
C4H6 1-Methylcyclopropene rCH 1.098 1.792 0.694
C4H6 1-Methylcyclopropene rCH 1.098 1.776 0.678
S4 Sulfur tetramer rSS 2.155 2.719 0.564
S4 Sulfur tetramer rSS 2.155 2.719 0.564
C4H6 1-Methylcyclopropene rCH 1.070 1.524 0.454
CH3CH2SH ethanethiol rCH 1.089 1.530 0.441
CH3CH2SH ethanethiol rCH 1.089 1.528 0.439
CH3CH2SH ethanethiol rCH 1.092 1.530 0.438
CH3CH2SH ethanethiol rCH 1.092 1.528 0.436
C2H4F2 1,2-difluoroethane rCH 1.093 1.519 0.426
C4H6 1-Methylcyclopropene rCC 1.515 1.098 -0.417
C2H4F2 1,2-difluoroethane rCH 1.093 1.507 0.414
CH2CHCH2F Allyl Fluoride rHC 1.130 1.501 0.371
CH2CHCH2F Allyl Fluoride rHC 1.130 1.497 0.367
C3H3NO Isoxazole rCH 1.075 1.424 0.349
CH3CH2SH ethanethiol rCC 1.528 1.842 0.314
CH3CH2SH ethanethiol rCC 1.528 1.839 0.311
CH3CH2SH ethanethiol rCS 1.820 1.528 -0.292
CH3CH2SH ethanethiol rCS 1.820 1.530 -0.290
S4 Sulfur tetramer rSS 1.898 2.157 0.259
C2H2+ acetylene cation rCH 1.077 1.322 0.245
C4H6 1-Methylcyclopropene rCC 1.300 1.528 0.228
Si2H2 disilyne rSiSi 2.215 2.013 -0.203
Si2H2 disilyne rSiH 1.668 1.467 -0.201
Si2H2 disilyne rSiH 1.668 1.496 -0.172
ONNO NO dimer rNN 2.236 2.069 -0.167
N2 Nitrogen diatomic rNN 1.098 1.231 0.133
N2 Nitrogen diatomic rNN 1.098 1.231 0.133
Ar2 Argon diatomic rArAr 3.758 3.886 0.128
Na2 Sodium diatomic rNaNa 3.079 3.199 0.120
NaLi lithium sodium rLiNa 2.889 2.992 0.103
Si2H2 disilyne rSiSi 2.215 2.122 -0.094
FNO Nitrosyl fluoride rNF 1.512 1.602 0.090
C2H2+ acetylene cation rCC 1.253 1.343 0.090
SO Sulfur monoxide rSO 1.481 1.569 0.088
SO Sulfur monoxide rSO 1.481 1.569 0.088
ClNO Nitrosyl chloride rNCl 1.975 2.062 0.087
N2 Nitrogen diatomic rNN 1.213 1.132 -0.081
N2 Nitrogen diatomic rNN 1.213 1.132 -0.081
N2 Nitrogen diatomic rNN 1.213 1.132 -0.081
N2 Nitrogen diatomic rNN 1.213 1.132 -0.081
AlBr Aluminum monobromide rAlBr 2.295 2.369 0.074
S4 Sulfur tetramer rSS 1.898 1.970 0.072
SO+ sulfur monoxide cation rOS 1.424 1.496 0.072
SO2 Sulfur dioxide rSO 1.432 1.504 0.072
S4 Sulfur tetramer rSS 1.898 1.970 0.072
C4H8O2 Ethyl acetate rCO 1.448 1.518 0.070
SSO Disulfur monoxide rSO 1.456 1.526 0.070
AlNC Aluminum isocyanide rAlN 1.855 1.924 0.069
SO Sulfur monoxide rOS 1.500 1.569 0.069
SO Sulfur monoxide rOS 1.500 1.569 0.069
F2+ flourine diatomic cation rFF 1.322 1.390 0.068
PF2 Phosphorus difluoride rPF 1.579 1.647 0.067
SiF2 Silicon difluoride rFSi 1.590 1.657 0.067
OClO Chlorine dioxide rClO 1.470 1.535 0.065
LiBr Lithium Bromide rLiBr 2.170 2.235 0.064
SiH2F2 difluorosilane rSiF 1.576 1.639 0.063
SO3 Sulfur trioxide rSO 1.418 1.480 0.063
SiH3F monofluorosilane rSiF 1.595 1.657 0.062
SiO Silicon monoxide rSiO 1.510 1.571 0.062
HSiCl Chlorosilylene rSiCl 2.067 2.129 0.062
SiCl Clorosilylidyne rSiCl 2.061 2.123 0.061
SF2 sulfur difluoride rSF 1.587 1.649 0.061
SSO Disulfur monoxide rSS 1.884 1.945 0.061
PN Phosphorus mononitride rPN 1.491 1.552 0.061
PS phosphorus sulfide rPS 1.900 1.839 -0.061
SF4 Sulfur tetrafluoride rSF 1.545 1.606 0.061
SiHF3 trifluorosilane rSiF 1.563 1.622 0.060
Si2H2 disilyne rSiSi 2.215 2.156 -0.060
Cl2+ chlorine diatomic cation rClCl 1.892 1.950 0.059
CH3SOCH3 Dimethyl sulfoxide rSO 1.485 1.544 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
SiP Silicon monophosphide rSiP 2.078 2.019 -0.058
SFCl Sulfur chloride fluoride rFS 1.606 1.664 0.058
HOSH hydrogen thioperoxide rSO 1.662 1.719 0.058
GaBr Gallium monobromide rGaBr 2.352 2.410 0.058
Si2H2 disilyne rSiH 1.668 1.725 0.057
SF Monosulfur monofluoride rSF 1.599 1.656 0.057
SF4 Sulfur tetrafluoride rSF 1.646 1.702 0.056
LiCl lithium chloride rLiCl 2.021 2.077 0.056
GaCl Gallium monochloride rClGa 2.202 2.257 0.056
NH2SH Thiohydroxylamine rNS 1.705 1.760 0.055
NH2SH Thiohydroxylamine rNS 1.705 1.760 0.055
CH3SSH Hydrogen methyl disulfide rSS 2.038 2.093 0.055
PF5 Phosphorus pentafluoride rPF 1.534 1.587 0.053
S2 Sulfur diatomic rSS 1.889 1.942 0.052
AlF Aluminum monofluoride rAlF 1.654 1.706 0.052
S3 Sulfur trimer rSS 1.917 1.969 0.052
HN3 hydrogen azide rNH 0.975 1.027 0.052
Cl2 Chlorine diatomic rClCl 1.988 2.040 0.052
GeCl Germanium monochloride rClGe 2.164 2.214 0.050
HCO Formyl radical rCH 1.080 1.130 0.050
100 molecules.