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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 QCISD/6-31G(2df,p)

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.214 3.129
C4H6 1-Methylcyclopropene rCH 1.087 3.421 2.334
C2H4O3 trioxolane124 rCN 1.303 2.171 0.868
C4H6 1-Methylcyclopropene rCC 1.476 2.257 0.781
C4H6 1-Methylcyclopropene rCH 1.087 1.825 0.738
CH3CH2SH ethanethiol rCH 1.095 1.828 0.733
CH3CH2SH ethanethiol rCH 1.095 1.826 0.731
HSSSH trisulfane rHS 1.344 2.070 0.726
HSSSH trisulfane rHS 1.344 2.070 0.726
HSSSH trisulfane rHS 1.344 2.069 0.726
HSSSH trisulfane rHS 1.344 2.069 0.726
S4 Sulfur tetramer rSS 2.155 2.867 0.712
C4H6 1-Methylcyclopropene rCH 1.098 1.776 0.678
C4H6 1-Methylcyclopropene rCH 1.098 1.760 0.662
Mg2 Magnesium diatomic rMgMg 3.891 4.547 0.657
Ne2 Neon diatomic rNeNe 3.100 2.534 -0.566
ONNO NO dimer rNN 2.236 1.726 -0.510
CH3SO2NH2 methanesulfonamide rCN 1.207 1.660 0.454
C4H6 1-Methylcyclopropene rCH 1.070 1.509 0.439
CH3CH2SH ethanethiol rCH 1.089 1.527 0.438
CH3CH2SH ethanethiol rCH 1.089 1.526 0.437
C4H10O Methyl propyl ether rCC 1.530 1.094 -0.436
Be2 Beryllium diatomic rBeBe 2.460 2.024 -0.436
CH3CH2SH ethanethiol rCH 1.092 1.527 0.435
CH3CH2SH ethanethiol rCH 1.092 1.526 0.434
C2H4F2 1,2-difluoroethane rCH 1.093 1.518 0.425
C4H6 1-Methylcyclopropene rCC 1.515 1.090 -0.425
C2H4F2 1,2-difluoroethane rCH 1.093 1.508 0.415
CH2CHCH2F Allyl Fluoride rHC 1.130 1.500 0.370
CH2CHCH2F Allyl Fluoride rHC 1.130 1.499 0.369
C3H3NO Isoxazole rCH 1.075 1.427 0.352
S4 Sulfur tetramer rSS 2.155 2.507 0.352
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 1.405 0.306
CH3CH2SH ethanethiol rCC 1.528 1.828 0.300
CH3CH2SH ethanethiol rCC 1.528 1.826 0.298
CH3CH2SH ethanethiol rCS 1.820 1.526 -0.294
CH3CH2SH ethanethiol rCS 1.820 1.527 -0.293
AlP Aluminum monophosphide rAlP 2.400 2.110 -0.290
AlP Aluminum monophosphide rAlP 2.400 2.110 -0.290
AlP Aluminum monophosphide rAlP 2.400 2.110 -0.290
Al2 Aluminum diatomic rAlAl 2.701 2.974 0.272
C2H2+ acetylene cation rCH 1.077 1.315 0.238
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.274 0.234
Si2H2 disilyne rSiSi 2.215 1.982 -0.233
Be2 Beryllium diatomic rBeBe 2.460 2.683 0.223
S4 Sulfur tetramer rSS 1.898 2.120 0.222
C4H6 1-Methylcyclopropene rCC 1.300 1.509 0.209
Si2H2 disilyne rSiH 1.668 1.459 -0.209
GaP Gallium monophosphide rPGa 2.450 2.251 -0.199
GaP Gallium monophosphide rPGa 2.450 2.251 -0.199
GaP Gallium monophosphide rPGa 2.450 2.251 -0.199
GaP Gallium monophosphide rPGa 2.450 2.251 -0.199
Ar2 Argon diatomic rArAr 3.758 3.956 0.198
Si2H2 disilyne rSiH 1.668 1.486 -0.182
S3 Sulfur trimer rSS 1.917 2.089 0.172
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
AlP Aluminum monophosphide rAlP 2.400 2.236 -0.164
CHF2CHF2 1,1,2,2-tetrafluoroethane rCF 1.359 1.519 0.160
Si2 Silicon diatomic rSiSi 2.246 2.086 -0.160
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.081 -0.159
AlP Aluminum monophosphide rAlP 2.260 2.110 -0.150
AlP Aluminum monophosphide rAlP 2.260 2.110 -0.150
AlP Aluminum monophosphide rAlP 2.260 2.110 -0.150
GaP Gallium monophosphide rPGa 2.110 2.251 0.141
GaP Gallium monophosphide rPGa 2.110 2.251 0.141
GaP Gallium monophosphide rPGa 2.110 2.251 0.141
GaP Gallium monophosphide rPGa 2.110 2.251 0.141
NaK Sodium Potassium rNaK 3.589 3.451 -0.138
K2 Potassium diatomic rKK 3.905 4.043 0.138
CaS Calcium sulfide rSCa 2.318 2.449 0.131
N2O3 Dinitrogen trioxide rNN 1.864 1.734 -0.130
ClF3 Chlorine trifluoride rFCl 1.597 1.727 0.130
ClF3 Chlorine trifluoride rFCl 1.597 1.727 0.130
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
CrH Chromium hydride rHCr 1.655 1.780 0.125
N2 Nitrogen diatomic rNN 1.098 1.217 0.119
N2 Nitrogen diatomic rNN 1.098 1.217 0.119
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
Ar2+ Argon diatomic cation rArAr 2.320 2.434 0.114
N2O4 Dinitrogen tetroxide rNN 1.782 1.669 -0.113
PF3 Phosphorus trifluoride rFP 1.561 1.672 0.111
AlP Aluminum monophosphide rAlP 2.220 2.110 -0.110
AlP Aluminum monophosphide rAlP 2.220 2.110 -0.110
AlP Aluminum monophosphide rAlP 2.220 2.110 -0.110
N2 Nitrogen diatomic rNN 1.213 1.104 -0.109
N2 Nitrogen diatomic rNN 1.213 1.104 -0.109
N2 Nitrogen diatomic rNN 1.213 1.104 -0.109
N2 Nitrogen diatomic rNN 1.213 1.104 -0.109
SeO3 selenium trioxide rSeO 1.688 1.582 -0.106
Si2H2 disilyne rSiSi 2.215 2.116 -0.100
CaH Calcium monohydride rCaH 2.003 2.099 0.097
CaH Calcium monohydride rCaH 2.003 2.099 0.097
NF3 Nitrogen trifluoride rNF 1.365 1.461 0.097
Si2H2 disilyne rSiSi 2.215 2.121 -0.095
CaCl calcium monochloride rClCa 2.437 2.527 0.090
Na2 Sodium diatomic rNaNa 3.079 3.168 0.089
Na2 Sodium diatomic rNaNa 3.079 3.168 0.089
AlN Aluminum nitride rNAl 1.786 1.699 -0.088
CaBr Calcium monobromide rCaBr 2.594 2.681 0.087
CO Carbon monoxide rCO 1.128 1.210 0.082
CHCl3 Chloroform rCCl 1.762 1.681 -0.081
C3H4O Cyclopropanone rCO 1.191 1.272 0.081
S4 Sulfur tetramer rSS 2.155 2.075 -0.080
SiP Silicon monophosphide rSiP 2.078 2.001 -0.077
C2 Carbon diatomic rCC 1.243 1.317 0.075
C2 Carbon diatomic rCC 1.243 1.317 0.075
C3H4O Cyclopropanone rCH 1.086 1.013 -0.073
SiC silicon monocarbide rCSi 1.722 1.651 -0.071
SiC silicon monocarbide rCSi 1.722 1.651 -0.071
BN boron nitride rBN 1.325 1.254 -0.071
BN boron nitride rBN 1.325 1.254 -0.071
B4H10 Tetraborane(10) rHB 1.484 1.416 -0.068
C4H8O2 Ethyl acetate rCO 1.448 1.516 0.068
PCl3 Phosphorus trichloride rPCl 2.043 1.976 -0.067
BrNO Nitrosyl bromide rNBr 2.140 2.074 -0.066
B2 Boron diatomic rBB 1.590 1.525 -0.065
B2 Boron diatomic rBB 1.590 1.525 -0.065
KH Potassium hydride rKH 2.243 2.306 0.063
B4H10 Tetraborane(10) rHB 1.315 1.254 -0.061
NaLi lithium sodium rLiNa 2.889 2.950 0.061
NaLi lithium sodium rLiNa 2.889 2.950 0.061
CaC Calcium monocarbide rCCa 2.302 2.362 0.060
C2H2+ acetylene cation rCC 1.253 1.313 0.060
FNO Nitrosyl fluoride rNF 1.512 1.452 -0.060
FNO Nitrosyl fluoride rNF 1.512 1.452 -0.060
FNO2 Nitryl fluoride rNF 1.467 1.408 -0.059
Li2 Lithium diatomic rLiLi 2.673 2.732 0.059
GaAs Gallium arsenide rGaAs 2.530 2.475 -0.055
C4H6 Methylenecyclopropane rCH 1.088 1.035 -0.053
CH3CHNOH Acetaldoxime rCC 1.550 1.498 -0.052
BeCl2 Beryllium chloride rBeCl 1.750 1.802 0.052
As4 Arsenic tetramer rAsAs 2.435 2.384 -0.051
Ne2+ Neon diatomic cation rNeNe 1.765 1.714 -0.051
HCF Fluoromethylene rCH 1.138 1.087 -0.051
C4H6 Methylenecyclopropane rCH 1.090 1.040 -0.050
149 molecules.