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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/cc-pVQZ

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.202 3.117
C4H6 1-Methylcyclopropene rCH 1.087 3.404 2.317
C4H6 1-Methylcyclopropene rCC 1.476 2.248 0.772
C4H6 1-Methylcyclopropene rCH 1.087 1.824 0.737
CH3CH2SH ethanethiol rCH 1.095 1.817 0.722
CH3CH2SH ethanethiol rCH 1.095 1.814 0.719
S4 Sulfur tetramer rSS 2.155 2.829 0.674
C4H6 1-Methylcyclopropene rCH 1.098 1.770 0.672
C4H6 1-Methylcyclopropene rCH 1.098 1.753 0.655
Be2 Beryllium diatomic rBeBe 2.460 2.012 -0.448
C4H6 1-Methylcyclopropene rCH 1.070 1.506 0.436
S4 Sulfur tetramer rSS 2.155 2.585 0.430
C4H6 1-Methylcyclopropene rCC 1.515 1.085 -0.430
S4 Sulfur tetramer rSS 2.155 2.584 0.429
CH3CH2SH ethanethiol rCH 1.089 1.518 0.429
CH3CH2SH ethanethiol rCH 1.089 1.516 0.427
CH3CH2SH ethanethiol rCH 1.092 1.518 0.426
CH3CH2SH ethanethiol rCH 1.092 1.516 0.424
C2H4F2 1,2-difluoroethane rCH 1.093 1.509 0.416
GaP Gallium monophosphide rPGa 2.450 2.036 -0.414
GaP Gallium monophosphide rPGa 2.450 2.036 -0.414
GaP Gallium monophosphide rPGa 2.450 2.036 -0.414
GaP Gallium monophosphide rPGa 2.450 2.036 -0.414
C2H4F2 1,2-difluoroethane rCH 1.093 1.497 0.404
CH2CHCH2F Allyl Fluoride rHC 1.130 1.489 0.359
CH2CHCH2F Allyl Fluoride rHC 1.130 1.486 0.356
AlP Aluminum monophosphide rAlP 2.400 2.051 -0.349
AlP Aluminum monophosphide rAlP 2.400 2.051 -0.349
AlP Aluminum monophosphide rAlP 2.400 2.051 -0.349
C3H3NO Isoxazole rCH 1.075 1.409 0.334
GaP Gallium monophosphide rPGa 2.110 2.429 0.319
GaP Gallium monophosphide rPGa 2.110 2.429 0.319
GaP Gallium monophosphide rPGa 2.110 2.429 0.319
GaP Gallium monophosphide rPGa 2.110 2.429 0.319
CH3CH2SH ethanethiol rCS 1.820 1.516 -0.304
CH3CH2SH ethanethiol rCS 1.820 1.518 -0.302
Mg2 Magnesium diatomic rMgMg 3.891 4.188 0.297
CH3CH2SH ethanethiol rCC 1.528 1.817 0.289
CH3CH2SH ethanethiol rCC 1.528 1.814 0.286
Be2 Beryllium diatomic rBeBe 2.460 2.733 0.273
ONNO NO dimer rNN 2.236 1.977 -0.259
Al2 Aluminum diatomic rAlAl 2.701 2.463 -0.238
Si2H2 disilyne rSiSi 2.215 1.984 -0.231
C2H2+ acetylene cation rCH 1.077 1.304 0.227
B2 Boron diatomic rBB 1.590 1.375 -0.215
GaP Gallium monophosphide rPGa 2.250 2.036 -0.214
GaP Gallium monophosphide rPGa 2.250 2.036 -0.214
GaP Gallium monophosphide rPGa 2.250 2.036 -0.214
GaP Gallium monophosphide rPGa 2.250 2.036 -0.214
Si2H2 disilyne rSiH 1.668 1.457 -0.211
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.400 2.190 -0.210
AlP Aluminum monophosphide rAlP 2.260 2.051 -0.209
AlP Aluminum monophosphide rAlP 2.260 2.051 -0.209
AlP Aluminum monophosphide rAlP 2.260 2.051 -0.209
C4H6 1-Methylcyclopropene rCC 1.300 1.508 0.208
S4 Sulfur tetramer rSS 1.898 2.102 0.204
GaP Gallium monophosphide rPGa 2.240 2.036 -0.204
GaP Gallium monophosphide rPGa 2.240 2.036 -0.204
GaP Gallium monophosphide rPGa 2.240 2.036 -0.204
GaP Gallium monophosphide rPGa 2.240 2.036 -0.204
GaP Gallium monophosphide rPGa 2.240 2.429 0.189
GaP Gallium monophosphide rPGa 2.240 2.429 0.189
GaP Gallium monophosphide rPGa 2.240 2.429 0.189
GaP Gallium monophosphide rPGa 2.240 2.429 0.189
Si2H2 disilyne rSiH 1.668 1.482 -0.186
Si2 Silicon diatomic rSiSi 2.246 2.066 -0.180
GaP Gallium monophosphide rPGa 2.250 2.429 0.179
GaP Gallium monophosphide rPGa 2.250 2.429 0.179
GaP Gallium monophosphide rPGa 2.250 2.429 0.179
GaP Gallium monophosphide rPGa 2.250 2.429 0.179
Mg2 Magnesium diatomic rMgMg 3.891 4.064 0.174
AlP Aluminum monophosphide rAlP 2.220 2.051 -0.169
AlP Aluminum monophosphide rAlP 2.220 2.051 -0.169
AlP Aluminum monophosphide rAlP 2.220 2.051 -0.169
S3 Sulfur trimer rSS 1.917 2.074 0.157
FO Oxygen monofluoride rFO 1.354 1.499 0.145
Si2H2 disilyne rSiSi 2.215 2.094 -0.121
N2 Nitrogen diatomic rNN 1.098 1.214 0.117
N2 Nitrogen diatomic rNN 1.098 1.214 0.117
Ar2 Argon diatomic rArAr 3.758 3.870 0.112
BC boron monocarbide rBC 1.491 1.382 -0.109
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
N2 Nitrogen diatomic rNN 1.213 1.110 -0.102
CaO Calcium monoxide rOCa 1.822 1.922 0.100
Si2H2 disilyne rSiSi 2.215 2.119 -0.097
Na2 Sodium diatomic rNaNa 3.079 3.176 0.097
VO Vanadium monoxide rVO 1.589 1.495 -0.095
Na2 Sodium diatomic rNaNa 3.079 3.173 0.094
SiP Silicon monophosphide rSiP 2.078 1.988 -0.089
Ne2 Neon diatomic rNeNe 3.100 3.185 0.085
GaCl3 Gallium trichloride rClGa 2.180 2.095 -0.085
NS Mononitrogen monosulfide rNS 1.497 1.412 -0.085
NaLi lithium sodium rLiNa 2.889 2.972 0.083
NaLi lithium sodium rLiNa 2.889 2.972 0.083
Ar2+ Argon diatomic cation rArAr 2.320 2.398 0.078
B4H10 Tetraborane(10) rHB 1.484 1.408 -0.076
PS phosphorus sulfide rPS 1.900 1.825 -0.075
B2 Boron diatomic rBB 1.590 1.516 -0.074
B2 Boron diatomic rBB 1.590 1.516 -0.074
GaP Gallium monophosphide rPGa 2.110 2.036 -0.074
GaP Gallium monophosphide rPGa 2.110 2.036 -0.074
GaP Gallium monophosphide rPGa 2.110 2.036 -0.074
GaP Gallium monophosphide rPGa 2.110 2.036 -0.074
Li2 Lithium diatomic rLiLi 2.673 2.746 0.073
Li2 Lithium diatomic rLiLi 2.673 2.746 0.073
C2 Carbon diatomic rCC 1.243 1.313 0.070
C2 Carbon diatomic rCC 1.243 1.313 0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
AlP Aluminum monophosphide rAlP 2.260 2.190 -0.070
CaBr Calcium monobromide rCaBr 2.594 2.662 0.068
NaF sodium fluoride rNaF 1.926 1.994 0.068
NaF sodium fluoride rNaF 1.926 1.994 0.068
ScF Scandium monofluoride rFSc 1.788 1.853 0.065
B4H10 Tetraborane(10) rHB 1.315 1.251 -0.064
C2H2+ acetylene cation rCC 1.253 1.316 0.063
GaO Gallium monoxide rOGa 1.743 1.680 -0.063
GaO Gallium monoxide rOGa 1.743 1.680 -0.063
BrO+ Bromine monoxide cation rOBr 1.635 1.576 -0.059
C3H5 Allyl radical rCC 1.428 1.370 -0.058
C4H8O2 Ethyl acetate rCO 1.448 1.506 0.058
HCF Fluoromethylene rCH 1.138 1.080 -0.058
HCF Fluoromethylene rCH 1.138 1.081 -0.057
CP Carbon monophosphide rCP 1.562 1.507 -0.055
Ne2+ Neon diatomic cation rNeNe 1.765 1.711 -0.054
NCl nitrogen monochloride rNCl 1.611 1.558 -0.053
BH Boron monohydride rBH 1.232 1.182 -0.050
141 molecules.