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IV.D.7. (XVIII.A.2.)

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 MP2FC/6-31G*

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C6H8 1,3-Cyclohexadiene rCC 1.521 3.396 1.875
C6H8 1,3-Cyclohexadiene rCH 1.090 2.461 1.371
Mg2 Magnesium diatomic rMgMg 3.891 2.567 -1.324
C6H8 1,3-Cyclohexadiene rCH 1.100 2.250 1.150
H2ONH3 Water Ammonia Dimer rNH 2.983 1.991 -0.992
FO2 Dioxygen monofluoride rFO 1.649 2.598 0.949
C2H5NO3 Nitric acid, ethyl ester rCO 1.430 2.346 0.916
C6H8 1,3-Cyclohexadiene rCC 1.466 2.207 0.741
Be2 Beryllium diatomic rBeBe 2.460 1.792 -0.668
Ne2 Neon dimer rNeNe 3.100 2.593 -0.507
C6H8 1,3-Cyclohexadiene rCC 1.536 1.088 -0.448
C4H6O2 2,3-Butanedione rCH 1.114 1.536 0.422
CH2ClCH2CH3 Propane, 1-chloro- rCH 1.113 1.524 0.411
Al2 Aluminum diatomic rAlAl 2.701 2.966 0.265
C6H8 1,3-Cyclohexadiene rCC 1.349 1.088 -0.261
Al2 Aluminum diatomic rAlAl 2.701 2.479 -0.222
B2 Boron diatomic rBB 1.590 1.389 -0.201
Cu2 Copper dimer rCuCu 2.220 2.029 -0.191
Si2 Silicon diatomic rSiSi 2.246 2.073 -0.173
FO Oxygen monofluoride rFO 1.354 1.506 0.152
AlN Aluminum nitride rNAl 1.786 1.641 -0.146
Na2+ sodium dimer cation rNaNa 3.540 3.680 0.140
CaCl calcium monochloride rClCa 2.437 2.566 0.129
CaH Calcium monohydride rHCa 2.003 2.130 0.128
Li2 Lithium diatomic rLiLi 2.673 2.782 0.109
ClF+ clorine monofluoride cation rFCl 1.448 1.556 0.108
CuF Copper monofluoride rCuF 1.745 1.646 -0.099
CaOH Calcium monohydroxide rOCa 1.976 2.075 0.099
Na2 Sodium diatomic rNaNa 3.079 3.169 0.091
NaLi lithium sodium rLiNa 2.889 2.978 0.089
ClFO3 Perchloryl fluoride rFCl 1.598 1.684 0.086
C2 Carbon diatomic rCC 1.243 1.323 0.080
PS phosphorus sulfide rPS 1.900 1.821 -0.079
CaF Calcuium monofluoride rFCa 1.967 2.044 0.077
CuH Copper monohydride rHCu 1.463 1.386 -0.076
SeO Selenium monoxide rSeO 1.639 1.715 0.076
KH Potassium hydride rHK 2.243 2.318 0.075
ONNO NO dimer rNN 2.236 2.161 -0.075
PCl5 Phosphorus pentachloride rPCl 2.214 2.139 -0.075
KCl Potassium Chloride rKCl 2.667 2.741 0.074
N2O3 Dinitrogen trioxide rNN 1.864 1.937 0.073
SO Sulfur monoxide rSO 1.481 1.553 0.072
O2+ diatomic oxygen cation rOO 1.116 1.188 0.072
He2+ helium dimer cation rHeHe 1.081 1.152 0.071
ClNO2 Nitryl chloride rNCl 1.840 1.909 0.069
LiO lithium oxide rLiO 1.688 1.619 -0.069
B2 Boron diatomic rBB 1.590 1.523 -0.067
CuCl Copper monochloride rCuCl 2.051 1.985 -0.066
CH2ClCHCl2 1,1,2-trichloroethane rCC 1.580 1.517 -0.063
NS Mononitrogen monosulfide rNS 1.497 1.436 -0.061
CH2SHCH2SH 1,2-Ethanedithiol rSH 1.400 1.341 -0.059
ClNO Nitrosyl chloride rNCl 1.975 2.033 0.058
SO+ sulfur monoxide cation rOS 1.424 1.482 0.058
CH3CHNOH Acetaldoxime rCC 1.550 1.493 -0.057
BHCl2 Borane, dichloro- rBH 1.130 1.185 0.055
SO2F2 Sulfuryl fluoride rFS 1.530 1.585 0.055
CO Carbon monoxide rCO 1.206 1.151 -0.055
CO Carbon monoxide rCO 1.206 1.151 -0.055
Se2 Selenium diatomic rSeSe 2.166 2.220 0.054
HCF Fluoromethylene rCH 1.138 1.086 -0.052
Li2O dilithium oxide rLiO 1.606 1.658 0.052
C5H10 2-Pentene, (E)- rCC 1.576 1.525 -0.051
BrF5 bromine pentafluoride rFBr 1.689 1.740 0.051
63 molecules.