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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 MP2/6-31G*

17 02 03 13 22
Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
H2ONH3 Water Ammonia Dimer rNH 2.983 2.066 -0.917
C4H4N2O2 Uracil rNH 0.836 1.012 0.176
C4H4N2O2 Uracil rCH 0.931 1.081 0.150
C4H4N2O2 Uracil rNH 0.877 1.015 0.138
C4H4N2O2 Uracil rCH 0.957 1.085 0.128
C2H6O2S Dimethyl sulfone rCS 1.777 1.573 -0.204
C2H6O2S Dimethyl sulfone rSO 1.431 1.631 0.200
C(CH3)3NH2 2-Propanamine, 2-methyl- rNH 1.048 1.468 0.420
C4H10O Ethanol, 1,1-dimethyl- rCH 1.117 2.424 1.307
C4H10O Ethanol, 1,1-dimethyl- rCO 1.446 2.168 0.722
C3H6O 2-Propen-1-ol rOH 0.960 4.073 3.113
C3H6O 2-Propen-1-ol rCH 1.092 3.494 2.402
C3H6O 2-Propen-1-ol rCH 1.091 2.760 1.669
C3H6O 2-Propen-1-ol rCH 1.078 2.500 1.422
C3H6O 2-Propen-1-ol rCH 1.102 2.356 1.254
C3H6O 2-Propen-1-ol rCH 1.096 2.100 1.004
C3H6O 2-Propen-1-ol rCO 1.428 2.091 0.663
C3H6O 2-Propen-1-ol rCC 1.337 1.952 0.615
C3H6O 2-Propen-1-ol rCC 1.502 0.971 -0.531
C4H8S Thiophene, tetrahydro- rCC 1.532 3.289 1.757
C4H8S Thiophene, tetrahydro- rCH 1.117 1.831 0.714
C4H8S Thiophene, tetrahydro- rCS 1.835 2.162 0.327
C2F4 Tetrafluoroethylene rCF 1.319 1.425 0.106
C5H8O Cyclopentanone rCH 1.095 2.790 1.695
C5H8O Cyclopentanone rCC 1.557 2.456 0.899
C5H8O Cyclopentanone rCC 1.504 1.766 0.262
C5H8O Cyclopentanone rCO 1.215 1.093 -0.122
C2Cl4 Tetrachloroethylene rCCl 1.718 1.579 -0.139
C3H3NO Isoxazole rCH 1.075 1.414 0.339
C3H3NO Oxazole rCH 1.073 3.156 2.083
C3H3NO Oxazole rCC 1.353 3.147 1.795
C3H3NO Oxazole rCH 1.075 2.208 1.133
C3H3NO Oxazole rCH 1.075 2.148 1.073
C3H3NO Oxazole rCO 1.357 2.248 0.891
C3H3NO Oxazole rCN 1.395 1.080 -0.315
C2H4O3 trioxolane124 rCN 1.303 1.418 0.115
CH3CF3 Ethane, 1,1,1-trifluoro- rCF 1.340 1.664 0.324
C4H10O Methyl propyl ether rCC 1.530 1.094 -0.436
C4H10O Methyl propyl ether rCH 1.099 1.416 0.317
C5H8O Methyl cyclopropyl ketone rCH 1.126 5.438 4.312
C5H8O Methyl cyclopropyl ketone rCO 1.225 2.511 1.286
C5H8O Methyl cyclopropyl ketone rCC 1.510 2.539 1.029
CaO Calcium monoxide rOCa 1.822 2.067 0.245
CF3 Trifluoromethyl radical rCF 1.318 1.430 0.112
HOCO+ Hydrocarboxyl cation rCO 1.209 1.352 0.144
C4H6 1-Methylcyclopropene rCH 1.085 4.224 3.139
C4H6 1-Methylcyclopropene rCH 1.087 3.422 2.335
C4H6 1-Methylcyclopropene rCC 1.476 2.260 0.784
C4H6 1-Methylcyclopropene rCH 1.087 1.826 0.739
C4H6 1-Methylcyclopropene rCH 1.098 1.779 0.681
C4H6 1-Methylcyclopropene rCH 1.098 1.763 0.665
C4H6 1-Methylcyclopropene rCH 1.070 1.507 0.437
C4H6 1-Methylcyclopropene rCC 1.515 1.093 -0.422
C4H6 1-Methylcyclopropene rCC 1.300 1.508 0.208
CH3SO2NH2 methanesulfonamide rCN 1.207 1.683 0.477
HO2 Hydroperoxy radical rOH 0.971 1.838 0.867
HO2 Hydroperoxy radical rOO 1.331 0.983 -0.347
H2SO4 Sulfuric acid rOH 0.970 2.876 1.906
O2+ diatomic oxygen cation rOO 1.116 1.260 0.144
PF3 Phosphorus trifluoride rFP 1.561 1.677 0.116
SiF4 Silicon tetrafluoride rSiF 1.554 1.713 0.159
AsF5 Arsenic pentafluoride rAsF 1.711 1.922 0.211
AsF5 Arsenic pentafluoride rAsF 1.656 1.834 0.178
CaBr Calcium monobromide rCaBr 2.594 2.711 0.117
NO3 Nitrogen trioxide rNO 1.238 1.389 0.151
VO Vanadium monoxide rVO 1.589 1.441 -0.148
GaP Gallium monophosphide rPGa 2.450 2.219 -0.231
SiP Silicon monophosphide rSiP 2.078 1.813 -0.265
CaOH Calcium monohydroxide rOCa 1.976 2.078 0.102
Ne2 Neon diatomic rNeNe 3.100 2.986 -0.114
Cu2 Copper diatomic rCuCu 2.220 2.086 -0.133
ArH+ Argon hydride cation rArH 1.292 1.441 0.149
Na2Cl2 Disodium dichloride rNaCl 2.584 3.259 0.675
ClOOCl Dichlorine dioxide rOCl 1.704 1.577 -0.127
CP Carbon monophosphide rCP 1.562 1.764 0.202
NaO sodium monoxide rONa 2.052 1.863 -0.188
Ar2 Argon diatomic rArAr 3.758 4.178 0.420
Ar2+ Argon diatomic cation rArAr 2.320 2.518 0.198
AlCl Aluminum monochloride rAlCl 2.130 2.420 0.289
B2Cl4 Diboron tetrachloride rBB 1.702 1.551 -0.151
CaF Calcium monofluoride rFCa 1.967 2.280 0.313
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.275 0.235
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.081 -0.159
HSSSH trisulfane rHS 1.344 2.067 0.723
CrH Chromium hydride rHCr 1.655 1.794 0.139
Li2+ lithium diatomic cation rLiLi 3.112 2.966 -0.146
Be2 Beryllium diatomic rBeBe 2.460 1.939 -0.521
B2 Boron diatomic rBB 1.590 1.445 -0.145
CaH Calcium monohydride rCaH 2.003 2.130 0.128
CaCl calcium monochloride rClCa 2.437 2.559 0.122
S4 Sulfur tetramer rSS 2.155 2.850 0.695
CaS Calcium sulfide rSCa 2.318 2.515 0.198
AlP Aluminum monophosphide rAlP 2.400 2.201 -0.199
AlP Aluminum monophosphide rAlP 2.220 2.060 -0.160
K2 Potassium diatomic rKK 3.905 4.080 0.175
Mg2 Magnesium diatomic rMgMg 3.891 2.683 -1.208
Al2 Aluminum diatomic rAlAl 2.701 2.509 -0.192
CaC Calcium monocarbide rCCa 2.302 2.410 0.108
98 molecules.