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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(T)/6-31G**

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
Mg2 Magnesium diatomic rMgMg 3.891 2.608 -1.283
Mg2 Magnesium diatomic rMgMg 3.891 4.761 0.870
S4 Sulfur tetramer rSS 2.155 2.901 0.746
CH3CH2SH ethanethiol rCH 1.095 1.834 0.739
CH3CH2SH ethanethiol rCH 1.095 1.834 0.739
CH3CH2SH ethanethiol rCH 1.095 1.830 0.735
Be2 Beryllium diatomic rBeBe 2.460 1.806 -0.654
S4 Sulfur tetramer rSS 2.155 2.688 0.533
CH3SO2NH2 methanesulfonamide rCN 1.207 1.690 0.483
CH3CH2SH ethanethiol rCH 1.089 1.526 0.437
CH3CH2SH ethanethiol rCH 1.089 1.526 0.437
Ar2 Argon diatomic rArAr 3.758 4.195 0.437
C4H10O Methyl propyl ether rCC 1.530 1.093 -0.437
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
CH3CH2SH ethanethiol rCH 1.092 1.526 0.434
CH3CH2SH ethanethiol rCH 1.092 1.526 0.434
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
C2H4F2 1,2-difluoroethane rCH 1.093 1.516 0.423
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 1.498 0.368
GaP Gallium monophosphide rPGa 2.450 2.122 -0.328
GaP Gallium monophosphide rPGa 2.450 2.122 -0.328
GaP Gallium monophosphide rPGa 2.450 2.122 -0.328
GaP Gallium monophosphide rPGa 2.450 2.122 -0.328
C4H10O Methyl propyl ether rCH 1.099 1.418 0.319
CH3CH2SH ethanethiol rCC 1.528 1.834 0.306
CH3CH2SH ethanethiol rCC 1.528 1.834 0.306
CH3CH2SH ethanethiol rCC 1.528 1.830 0.302
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
CH3CH2SH ethanethiol rCS 1.820 1.526 -0.294
CH3CH2SH ethanethiol rCS 1.820 1.526 -0.294
S4 Sulfur tetramer rSS 1.898 2.146 0.248
C2H2+ acetylene cation rCH 1.077 1.307 0.231
Si2H2 disilyne rSiSi 2.215 1.999 -0.216
CaS Calcium sulfide rSCa 2.318 2.528 0.211
Al2 Aluminum diatomic rAlAl 2.701 2.491 -0.210
Al2 Aluminum diatomic rAlAl 2.701 2.491 -0.210
Si2H2 disilyne rSiH 1.668 1.460 -0.208
Ar2+ Argon diatomic cation rArAr 2.320 2.526 0.206
GaP Gallium monophosphide rPGa 2.450 2.253 -0.197
GaP Gallium monophosphide rPGa 2.450 2.253 -0.197
GaP Gallium monophosphide rPGa 2.450 2.253 -0.197
GaP Gallium monophosphide rPGa 2.450 2.253 -0.197
S3 Sulfur trimer rSS 1.917 2.106 0.189
Si2H2 disilyne rSiH 1.668 1.486 -0.182
ClF3 Chlorine trifluoride rFCl 1.597 1.766 0.170
ClF3 Chlorine trifluoride rFCl 1.597 1.766 0.170
CaO Calcium monoxide rOCa 1.822 1.979 0.157
GaP Gallium monophosphide rPGa 2.110 2.253 0.143
GaP Gallium monophosphide rPGa 2.110 2.253 0.143
GaP Gallium monophosphide rPGa 2.110 2.253 0.143
GaP Gallium monophosphide rPGa 2.110 2.253 0.143
S4 Sulfur tetramer rSS 2.155 2.290 0.135
N2 Nitrogen diatomic rNN 1.098 1.231 0.134
N2 Nitrogen diatomic rNN 1.098 1.231 0.134
CrH Chromium hydride rHCr 1.655 1.784 0.129
GaP Gallium monophosphide rPGa 2.250 2.122 -0.128
GaP Gallium monophosphide rPGa 2.250 2.122 -0.128
GaP Gallium monophosphide rPGa 2.250 2.122 -0.128
GaP Gallium monophosphide rPGa 2.250 2.122 -0.128
CaH Calcium monohydride rCaH 2.003 2.125 0.123
CaH Calcium monohydride rCaH 2.003 2.125 0.123
GaP Gallium monophosphide rPGa 2.240 2.122 -0.118
GaP Gallium monophosphide rPGa 2.240 2.122 -0.118
GaP Gallium monophosphide rPGa 2.240 2.122 -0.118
GaP Gallium monophosphide rPGa 2.240 2.122 -0.118
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
CuO Copper Monoxide rCuO 1.724 1.632 -0.093
Si2H2 disilyne rSiSi 2.215 2.129 -0.086
Na2 Sodium diatomic rNaNa 3.079 3.164 0.086
Na2 Sodium diatomic rNaNa 3.079 3.164 0.085
Na2 Sodium diatomic rNaNa 3.079 3.164 0.085
Si2H2 disilyne rSiSi 2.215 2.135 -0.080
KH Potassium hydride rKH 2.243 2.316 0.073
ClF3 Chlorine trifluoride rFCl 1.697 1.766 0.070
ClF3 Chlorine trifluoride rFCl 1.697 1.766 0.070
ClOF3 Chlorine trifluoride oxide rFCl 1.603 1.673 0.070
LiO lithium oxide rLiO 1.688 1.619 -0.069
LiO lithium oxide rLiO 1.688 1.619 -0.069
SiP Silicon monophosphide rSiP 2.078 2.010 -0.068
ClOOCl Dichlorine dioxide rOCl 1.704 1.772 0.068
C2H2+ acetylene cation rCC 1.253 1.320 0.067
Si2 Silicon diatomic rSiSi 2.246 2.180 -0.066
BrO Bromine monoxide rOBr 1.718 1.782 0.065
NaLi lithium sodium rLiNa 2.889 2.953 0.064
NaLi lithium sodium rLiNa 2.889 2.953 0.064
CuF Copper monofluoride rCuF 1.745 1.683 -0.062
OClO Chlorine dioxide rClO 1.470 1.531 0.061
Li2 Lithium diatomic rLiLi 2.673 2.733 0.060
SO Sulfur monoxide rSO 1.481 1.540 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
CaBr2 Calcium dibromide rCaBr 2.616 2.673 0.057
ClS2 Sulfur chloride rSCl 2.071 2.124 0.053
Br2 Bromine diatomic rBrBr 2.281 2.334 0.053
BrCl Bromine monochloride rClBr 2.136 2.188 0.052
HCF Fluoromethylene rCH 1.138 1.086 -0.052
HCF Fluoromethylene rCH 1.138 1.086 -0.052
ClF3 Chlorine trifluoride rFCl 1.597 1.649 0.052
ClF3 Chlorine trifluoride rFCl 1.597 1.649 0.052
GeF+ Germanium monofluoride cation rFGe 1.665 1.717 0.051
TiCl Titanium Monochloride rClTi 2.265 2.316 0.051
ClOF3 Chlorine trifluoride oxide rOCl 1.405 1.456 0.051
108 molecules.