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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 wB97X-D/6-31G*

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.213 3.128
C4H6 1-Methylcyclopropene rCH 1.087 3.421 2.334
H2SO4 Sulfuric acid rOH 0.970 2.861 1.891
C4H8S Thiophene, tetrahydro- rCC 1.532 3.301 1.769
C4H10O Ethanol, 1,1-dimethyl- rCH 1.117 2.423 1.306
Mg2 Magnesium diatomic rMgMg 3.891 2.683 -1.208
H2ONH3 Water Ammonia Dimer rNH 2.983 2.048 -0.935
C4H6 1-Methylcyclopropene rCC 1.476 2.262 0.786
C4H6 1-Methylcyclopropene rCH 1.087 1.827 0.740
CH3CH2SH ethanethiol rCH 1.095 1.831 0.736
CH3CH2SH ethanethiol rCH 1.095 1.829 0.734
CH3CH2SH ethanethiol rCH 1.095 1.828 0.733
C4H10O Ethanol, 1,1-dimethyl- rCO 1.446 2.178 0.732
S4 Sulfur tetramer rSS 2.155 2.884 0.729
HSSSH trisulfane rHS 1.344 2.071 0.727
HSSSH trisulfane rHS 1.344 2.071 0.727
HSSSH trisulfane rHS 1.344 2.070 0.727
HSSSH trisulfane rHS 1.344 2.070 0.727
C4H8S Thiophene, tetrahydro- rCH 1.117 1.837 0.720
C4H6 1-Methylcyclopropene rCH 1.098 1.780 0.682
Na2Cl2 Disodium dichloride rNaCl 2.584 3.249 0.665
C4H6 1-Methylcyclopropene rCH 1.098 1.763 0.665
Be2 Beryllium diatomic rBeBe 2.460 1.939 -0.521
Be2 Beryllium diatomic rBeBe 2.460 1.939 -0.521
ONNO NO dimer rNN 2.236 1.727 -0.509
Li2 Lithium diatomic rLiLi 2.673 3.159 0.486
CH3SO2NH2 methanesulfonamide rCN 1.207 1.679 0.473
C4H4N2 Succinonitrile rCC 1.561 1.094 -0.467
C4H6 1-Methylcyclopropene rCH 1.070 1.508 0.438
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
CH3CH2SH ethanethiol rCH 1.089 1.523 0.434
C4H10O Methyl propyl ether rCC 1.530 1.096 -0.434
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
CH3CH2SH ethanethiol rCH 1.092 1.523 0.431
C2H4F2 1,2-difluoroethane rCH 1.093 1.520 0.427
C2H4F2 1,2-difluoroethane rCH 1.093 1.518 0.425
C4H4N2 Succinonitrile rCH 1.123 1.545 0.423
C4H6 1-Methylcyclopropene rCC 1.515 1.095 -0.420
C(CH3)3NH2 2-Propanamine, 2-methyl- rNH 1.048 1.468 0.420
C2H4F2 1,2-difluoroethane rCH 1.093 1.510 0.417
C2H4F2 1,2-difluoroethane rCH 1.093 1.508 0.415
S4 Sulfur tetramer rSS 2.155 2.536 0.381
CH2CHCH2F Allyl Fluoride rHC 1.130 1.497 0.367
GaP Gallium monophosphide rPGa 2.450 2.083 -0.367
GaP Gallium monophosphide rPGa 2.450 2.083 -0.367
GaP Gallium monophosphide rPGa 2.450 2.083 -0.367
GaP Gallium monophosphide rPGa 2.450 2.083 -0.367
CH2CHCH2F Allyl Fluoride rHC 1.130 1.496 0.366
C4H4N2 Succinonitrile rCH 1.111 1.464 0.353
C3H3NO Isoxazole rCH 1.075 1.421 0.346
C4H8S Thiophene, tetrahydro- rCS 1.835 2.164 0.329
CH3CF3 Ethane, 1,1,1-trifluoro- rCF 1.340 1.664 0.324
AlP Aluminum monophosphide rAlP 2.400 2.086 -0.314
AlP Aluminum monophosphide rAlP 2.400 2.086 -0.314
AlP Aluminum monophosphide rAlP 2.400 2.086 -0.314
CaF Calcium monofluoride rFCa 1.967 2.280 0.313
CH3CH2SH ethanethiol rCC 1.528 1.831 0.303
C4H10O Methyl propyl ether rCH 1.099 1.401 0.302
CH3CH2SH ethanethiol rCC 1.528 1.829 0.301
CH3CH2SH ethanethiol rCC 1.528 1.828 0.300
CH3CH2SH ethanethiol rCS 1.820 1.523 -0.297
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
SeO3 selenium trioxide rSeO 1.688 1.981 0.293
Ar2 Argon diatomic rArAr 3.758 4.050 0.292
AlCl Aluminum monochloride rAlCl 2.130 2.420 0.289
Si2H2 disilyne rSiSi 2.215 1.959 -0.257
Ar2+ Argon diatomic cation rArAr 2.320 2.567 0.247
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.287 0.247
C2H2+ acetylene cation rCH 1.077 1.316 0.240
S4 Sulfur tetramer rSS 1.898 2.128 0.230
B2 Boron diatomic rBB 1.590 1.362 -0.228
GaP Gallium monophosphide rPGa 2.450 2.231 -0.219
GaP Gallium monophosphide rPGa 2.450 2.231 -0.219
GaP Gallium monophosphide rPGa 2.450 2.231 -0.219
GaP Gallium monophosphide rPGa 2.450 2.231 -0.219
B2F4 Diboron tetrafluoride rBB 1.720 1.501 -0.219
AsF5 Arsenic pentafluoride rAsF 1.711 1.922 0.211
C4H6 1-Methylcyclopropene rCC 1.300 1.506 0.206
Si2H2 disilyne rSiH 1.668 1.463 -0.205
NaO sodium monoxide rONa 2.052 1.848 -0.204
Si2 Silicon diatomic rSiSi 2.246 2.047 -0.199
ZnS Zinc sulfide rSZn 2.046 2.243 0.196
CaO Calcium monoxide rOCa 1.822 2.015 0.193
CaO Calcium monoxide rOCa 1.822 2.008 0.186
Al2 Aluminum diatomic rAlAl 2.701 2.516 -0.186
SiP Silicon monophosphide rSiP 2.078 1.897 -0.180
AlP Aluminum monophosphide rAlP 2.400 2.222 -0.178
AlP Aluminum monophosphide rAlP 2.400 2.222 -0.178
AlP Aluminum monophosphide rAlP 2.400 2.222 -0.178
AsF5 Arsenic pentafluoride rAsF 1.656 1.834 0.178
ClF5 chlorinepentafluoride rFCl 1.650 1.826 0.176
Si2H2 disilyne rSiH 1.668 1.492 -0.176
AlP Aluminum monophosphide rAlP 2.260 2.086 -0.174
AlP Aluminum monophosphide rAlP 2.260 2.086 -0.174
AlP Aluminum monophosphide rAlP 2.260 2.086 -0.174
S3 Sulfur trimer rSS 1.917 2.090 0.173
C4H4N2O2 Uracil rNH 0.836 1.009 0.173
CH3SCH2CH3 Ethane, (methylthio)- rCS 1.804 1.636 -0.168
CH3SCH2CH3 Ethane, (methylthio)- rCS 1.804 1.636 -0.168
CHF2CHF2 1,1,2,2-tetrafluoroethane rCF 1.359 1.526 0.167
GaP Gallium monophosphide rPGa 2.250 2.083 -0.167
GaP Gallium monophosphide rPGa 2.250 2.083 -0.167
GaP Gallium monophosphide rPGa 2.250 2.083 -0.167
GaP Gallium monophosphide rPGa 2.250 2.083 -0.167
SiF4 Silicon tetrafluoride rSiF 1.554 1.713 0.159
GaP Gallium monophosphide rPGa 2.240 2.083 -0.157
GaP Gallium monophosphide rPGa 2.240 2.083 -0.157
GaP Gallium monophosphide rPGa 2.240 2.083 -0.157
GaP Gallium monophosphide rPGa 2.240 2.083 -0.157
B2Cl4 Diboron tetrachloride rBB 1.702 1.547 -0.155
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.086 -0.154
B2 Boron diatomic rBB 1.590 1.439 -0.151
C4H4N2O2 Uracil rCH 0.931 1.081 0.150
ArH+ Argon hydride cation rArH 1.292 1.441 0.149
C10H8 Azulene rCC 1.414 1.561 0.146
Li2+ lithium diatomic cation rLiLi 3.112 2.966 -0.146
CaS Calcium sulfide rSCa 2.318 2.460 0.142
C2Cl4 Tetrachloroethylene rCCl 1.718 1.579 -0.139
BH3NH3 borane ammonia rBH 1.206 1.069 -0.137
ClF3 Chlorine trifluoride rFCl 1.597 1.733 0.136
ClF3 Chlorine trifluoride rFCl 1.597 1.733 0.136
C4H4N2O2 Uracil rNH 0.877 1.012 0.135
AlP Aluminum monophosphide rAlP 2.220 2.086 -0.134
AlP Aluminum monophosphide rAlP 2.220 2.086 -0.134
AlP Aluminum monophosphide rAlP 2.220 2.086 -0.134
Si2H2 disilyne rSiSi 2.215 2.083 -0.133
Cu2 Copper diatomic rCuCu 2.220 2.088 -0.132
ClOOCl Dichlorine dioxide rOCl 1.704 1.575 -0.129
C10H8 Azulene rCC 1.407 1.536 0.129
HOCO+ Hydrocarboxyl cation rCO 1.209 1.337 0.128
C4H4N2O2 Uracil rCH 0.957 1.084 0.127
B2F4 Diboron tetrafluoride rBF 1.317 1.439 0.122
GaP Gallium monophosphide rPGa 2.110 2.231 0.121
GaP Gallium monophosphide rPGa 2.110 2.231 0.121
GaP Gallium monophosphide rPGa 2.110 2.231 0.121
GaP Gallium monophosphide rPGa 2.110 2.231 0.121
Si2H2 disilyne rSiSi 2.215 2.095 -0.120
N2 Nitrogen diatomic rNN 1.213 1.094 -0.118
N2 Nitrogen diatomic rNN 1.213 1.094 -0.118
C10H8 Azulene rCC 1.405 1.288 -0.117
CaCl calcium monochloride rClCa 2.437 2.552 0.116
PF3 Phosphorus trifluoride rFP 1.561 1.674 0.113
CF3 Trifluoromethyl radical rCF 1.318 1.430 0.112
C10H8 Azulene rCC 1.398 1.286 -0.112
N2 Nitrogen diatomic rNN 1.213 1.102 -0.111
N2 Nitrogen diatomic rNN 1.213 1.102 -0.111
Al2 Aluminum diatomic rAlAl 2.701 2.591 -0.110
N2 Nitrogen diatomic rNN 1.098 1.208 0.110
N2 Nitrogen diatomic rNN 1.098 1.208 0.110
Ne2 Neon diatomic rNeNe 3.100 2.990 -0.110
CaH Calcium monohydride rCaH 2.003 2.112 0.109
NO3 Nitrogen trioxide rNO 1.238 1.345 0.107
C2F4 Tetrafluoroethylene rCF 1.319 1.425 0.106
C2H4O3 trioxolane124 rCN 1.303 1.409 0.106
CaC Calcium monocarbide rCCa 2.302 2.407 0.106
NO3 Nitrogen trioxide rNO 1.238 1.342 0.105
Si2 Silicon diatomic rSiSi 2.246 2.143 -0.104
SiP Silicon monophosphide rSiP 2.078 1.974 -0.103
K2 Potassium diatomic rKK 3.905 4.006 0.101
CF3CN Acetonitrile, trifluoro- rCF 1.328 1.428 0.100
BH3NH3 borane ammonia rBN 1.645 1.548 -0.097
NF3 Nitrogen trifluoride rNF 1.365 1.460 0.095
CaBr Calcium monobromide rCaBr 2.594 2.687 0.093
B2 Boron diatomic rBB 1.590 1.499 -0.091
BC boron monocarbide rBC 1.491 1.403 -0.088
HCCl Chloromethylene rCCl 1.696 1.608 -0.088
AlN Aluminum nitride rNAl 1.786 1.698 -0.088
SeO3 selenium trioxide rSeO 1.688 1.601 -0.087
FNO Nitrosyl fluoride rNF 1.512 1.425 -0.087
CaOH Calcium monohydroxide rOCa 1.976 2.062 0.086
S8 Octasulfur rSS 2.059 1.973 -0.086
C10H8 Azulene rCC 1.377 1.293 -0.084
SiC silicon monocarbide rCSi 1.722 1.638 -0.084
CHCl3 Chloroform rCCl 1.762 1.681 -0.081
C3H3N3 1,3,5-Triazine rCN 1.338 1.419 0.081
Al2 Aluminum diatomic rAlAl 2.701 2.621 -0.080
C3H4O Cyclopropanone rCO 1.191 1.270 0.079
SiC silicon monocarbide rCSi 1.722 1.643 -0.079
He2+ helium diatomic cation rHeHe 1.081 1.159 0.078
NO+ nitric oxide cation rNO 1.066 1.141 0.076
CuO Copper Monoxide rCuO 1.724 1.649 -0.076
CF3CN Acetonitrile, trifluoro- rCC 1.492 1.419 -0.073
C3H4O Cyclopropanone rCH 1.086 1.013 -0.073
GaCl3 Gallium trichloride rClGa 2.180 2.108 -0.072
LiK Lithium Potassium rLiK 3.270 3.340 0.070
KCl Potassium Chloride rKCl 2.667 2.737 0.070
H2Cl+ dihydrogen monochloride cation rHCl 1.321 1.390 0.069
N2O4 Dinitrogen tetroxide rNN 1.782 1.714 -0.068
CuF Copper monofluoride rCuF 1.745 1.677 -0.068
Si2H2 disilyne rSiH 1.668 1.735 0.067
FOO Dioxygen monofluoride radical rFO 1.649 1.583 -0.066
GaCl3 Gallium trichloride rClGa 2.180 2.114 -0.066
C4H8O2 Ethyl acetate rCO 1.448 1.514 0.066
C2 Carbon diatomic rCC 1.243 1.308 0.066
HOCO+ Hydrocarboxyl cation rCO 1.140 1.205 0.065
PCl3 Phosphorus trichloride rPCl 2.043 1.978 -0.065
ClFO3 Perchloryl fluoride rFCl 1.598 1.663 0.065
BH3NH3 borane ammonia rNH 1.010 0.947 -0.063
ClOOCl Dichlorine dioxide rOO 1.426 1.364 -0.062
N2O3 Dinitrogen trioxide rNN 1.864 1.802 -0.062
FSSF Difluorodisulfane rSS 1.890 1.950 0.060
HNO2 Nitrous acid rNO 1.442 1.383 -0.059
BN boron nitride rBN 1.325 1.266 -0.059
Li2 Lithium diatomic rLiLi 2.673 2.732 0.059
CO Carbon monoxide rCO 1.128 1.185 0.057
BHCl2 Borane, dichloro- rBH 1.130 1.187 0.057
CH2ClCHCl2 1,1,2-trichloroethane rCC 1.580 1.523 -0.057
CFCl chlorofluoromethylene rCCl 1.714 1.771 0.057
NaLi lithium sodium rLiNa 2.889 2.946 0.057
FNO Nitrosyl fluoride rNF 1.512 1.456 -0.056
LiCl lithium chloride rLiCl 2.021 2.076 0.056
CH2SHCH2SH 1,2-Ethanedithiol rSH 1.400 1.345 -0.055
LiCl lithium chloride rLiCl 2.021 2.075 0.054
H2O2 Hydrogen peroxide rOO 1.475 1.421 -0.054
CH3CHNOH Acetaldoxime rCC 1.550 1.496 -0.054
C4H10O Ethoxy ethane rCO 1.411 1.465 0.054
Na2 Sodium diatomic rNaNa 3.079 3.132 0.053
CH3CHNOH Acetaldoxime rCC 1.550 1.497 -0.053
NaK Sodium Potassium rNaK 3.589 3.536 -0.053
BrCN Cyanogen bromide rCBr 1.789 1.841 0.052
CH3CF3 Ethane, 1,1,1-trifluoro- rCH 1.081 1.029 -0.052
C4H6 Methylenecyclopropane rCH 1.088 1.036 -0.052
S4 Sulfur tetramer rSS 2.155 2.103 -0.052
CF3CN Acetonitrile, trifluoro- rCN 1.154 1.205 0.051
NCl nitrogen monochloride rNCl 1.611 1.662 0.051
C4H6 Methylenecyclopropane rCC 1.542 1.492 -0.050
229 molecules.