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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=FULL/6-311G*

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.222 3.137
C4H6 1-Methylcyclopropene rCH 1.087 3.420 2.333
C2H4O3 trioxolane124 rCN 1.303 2.174 0.871
C4H6 1-Methylcyclopropene rCC 1.476 2.260 0.784
C4H6 1-Methylcyclopropene rCH 1.087 1.830 0.743
HSSSH trisulfane rHS 1.344 2.076 0.732
HSSSH trisulfane rHS 1.344 2.076 0.732
HSSSH trisulfane rHS 1.344 2.076 0.732
HSSSH trisulfane rHS 1.344 2.076 0.732
CH3CH2SH ethanethiol rCH 1.095 1.820 0.725
CH3CH2SH ethanethiol rCH 1.095 1.820 0.725
CH3CH2SH ethanethiol rCH 1.095 1.817 0.722
S4 Sulfur tetramer rSS 2.155 2.871 0.716
C4H6 1-Methylcyclopropene rCH 1.098 1.777 0.679
Be2 Beryllium diatomic rBeBe 2.460 1.794 -0.666
C4H6 1-Methylcyclopropene rCH 1.098 1.760 0.662
S4 Sulfur tetramer rSS 2.155 2.783 0.628
Ar2 Argon diatomic rArAr 3.758 4.337 0.579
C4H4N2 Succinonitrile rCC 1.561 1.093 -0.468
CH3SO2NH2 methanesulfonamide rCN 1.207 1.671 0.464
Be2 Beryllium diatomic rBeBe 2.460 2.917 0.457
C4H6 1-Methylcyclopropene rCH 1.070 1.512 0.442
C4H10O Methyl propyl ether rCC 1.530 1.093 -0.437
Be2 Beryllium diatomic rBeBe 2.460 2.024 -0.436
CH3CH2SH ethanethiol rCH 1.089 1.523 0.434
CH3CH2SH ethanethiol rCH 1.089 1.523 0.434
CH3CH2SH ethanethiol rCH 1.089 1.521 0.432
CH3CH2SH ethanethiol rCH 1.092 1.523 0.431
CH3CH2SH ethanethiol rCH 1.092 1.523 0.431
CH3CH2SH ethanethiol rCH 1.092 1.521 0.429
C4H6 1-Methylcyclopropene rCC 1.515 1.091 -0.424
Mg2 Magnesium diatomic rMgMg 3.891 4.314 0.424
Mg2 Magnesium diatomic rMgMg 3.891 4.314 0.424
C2H4F2 1,2-difluoroethane rCH 1.093 1.512 0.419
C2H4F2 1,2-difluoroethane rCH 1.093 1.512 0.419
C4H4N2 Succinonitrile rCH 1.123 1.540 0.417
C2H4F2 1,2-difluoroethane rCH 1.093 1.501 0.408
C2H4F2 1,2-difluoroethane rCH 1.093 1.501 0.408
GaP Gallium monophosphide rPGa 2.450 2.047 -0.403
GaP Gallium monophosphide rPGa 2.450 2.047 -0.403
GaP Gallium monophosphide rPGa 2.450 2.047 -0.403
GaP Gallium monophosphide rPGa 2.450 2.047 -0.403
CH2CHCH2F Allyl Fluoride rHC 1.130 1.495 0.365
CH2CHCH2F Allyl Fluoride rHC 1.130 1.492 0.362
AlP Aluminum monophosphide rAlP 2.400 2.047 -0.353
AlP Aluminum monophosphide rAlP 2.400 2.047 -0.353
AlP Aluminum monophosphide rAlP 2.400 2.047 -0.353
C4H4N2 Succinonitrile rCH 1.111 1.462 0.351
C3H3NO Isoxazole rCH 1.075 1.416 0.341
C4H10O Methyl propyl ether rCH 1.099 1.409 0.310
CH3CH2SH ethanethiol rCS 1.820 1.521 -0.299
CH3CH2SH ethanethiol rCS 1.820 1.523 -0.297
CH3CH2SH ethanethiol rCS 1.820 1.523 -0.297
CH3CH2SH ethanethiol rCC 1.528 1.820 0.292
CH3CH2SH ethanethiol rCC 1.528 1.820 0.292
Al2 Aluminum diatomic rAlAl 2.701 2.991 0.290
CH3CH2SH ethanethiol rCC 1.528 1.817 0.289
Ne2 Neon diatomic rNeNe 3.100 2.818 -0.282
FOO Dioxygen monofluoride radical rFO 1.649 1.375 -0.274
GaP Gallium monophosphide rPGa 2.450 2.209 -0.241
GaP Gallium monophosphide rPGa 2.450 2.209 -0.241
GaP Gallium monophosphide rPGa 2.450 2.209 -0.241
GaP Gallium monophosphide rPGa 2.450 2.209 -0.241
Al2 Aluminum diatomic rAlAl 2.701 2.465 -0.236
Al2 Aluminum diatomic rAlAl 2.701 2.465 -0.236
Si2H2 disilyne rSiSi 2.215 1.980 -0.235
S4 Sulfur tetramer rSS 1.898 2.132 0.234
C2H2+ acetylene cation rCH 1.077 1.307 0.230
C4H6 1-Methylcyclopropene rCC 1.300 1.514 0.214
AlP Aluminum monophosphide rAlP 2.260 2.047 -0.213
AlP Aluminum monophosphide rAlP 2.260 2.047 -0.213
AlP Aluminum monophosphide rAlP 2.260 2.047 -0.213
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.252 0.212
Si2H2 disilyne rSiH 1.668 1.460 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
AlP Aluminum monophosphide rAlP 2.400 2.192 -0.208
B2 Boron diatomic rBB 1.590 1.385 -0.205
GaP Gallium monophosphide rPGa 2.250 2.047 -0.203
GaP Gallium monophosphide rPGa 2.250 2.047 -0.203
GaP Gallium monophosphide rPGa 2.250 2.047 -0.203
GaP Gallium monophosphide rPGa 2.250 2.047 -0.203
GaP Gallium monophosphide rPGa 2.240 2.047 -0.193
GaP Gallium monophosphide rPGa 2.240 2.047 -0.193
GaP Gallium monophosphide rPGa 2.240 2.047 -0.193
GaP Gallium monophosphide rPGa 2.240 2.047 -0.193
ClF3 Chlorine trifluoride rFCl 1.597 1.788 0.191
ClF3 Chlorine trifluoride rFCl 1.597 1.788 0.191
S3 Sulfur trimer rSS 1.917 2.103 0.186
Si2 Silicon diatomic rSiSi 2.246 2.064 -0.182
Si2H2 disilyne rSiH 1.668 1.487 -0.181
AlP Aluminum monophosphide rAlP 2.220 2.047 -0.173
AlP Aluminum monophosphide rAlP 2.220 2.047 -0.173
AlP Aluminum monophosphide rAlP 2.220 2.047 -0.173
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.068 -0.172
Ar2+ Argon diatomic cation rArAr 2.320 2.485 0.165
CHF2CHF2 1,1,2,2-tetrafluoroethane rCF 1.359 1.515 0.156
AlN Aluminum nitride rNAl 1.786 1.635 -0.152
Fe(CO)5 Iron pentacarbonyl rCFe 1.824 1.677 -0.147
FO Oxygen monofluoride rFO 1.354 1.498 0.144
NO3 Nitrogen trioxide rNO 1.238 1.379 0.141
N2 Nitrogen diatomic rNN 1.098 1.223 0.125
N2 Nitrogen diatomic rNN 1.098 1.223 0.125
Si2H2 disilyne rSiSi 2.215 2.096 -0.119
ClFO3 Perchloryl fluoride rFCl 1.598 1.711 0.113
ClNO2 Nitryl chloride rNCl 1.840 1.952 0.112
BC boron monocarbide rBC 1.491 1.385 -0.107
NaO sodium monoxide rONa 2.052 1.945 -0.106
NaO sodium monoxide rONa 2.052 1.945 -0.106
ClOF3 Chlorine trifluoride oxide rFCl 1.603 1.707 0.104
LiO lithium oxide rLiO 1.688 1.589 -0.100
LiO lithium oxide rLiO 1.688 1.589 -0.100
ClNO Nitrosyl chloride rNCl 1.975 2.074 0.099
GaP Gallium monophosphide rPGa 2.110 2.209 0.099
GaP Gallium monophosphide rPGa 2.110 2.209 0.099
GaP Gallium monophosphide rPGa 2.110 2.209 0.099
GaP Gallium monophosphide rPGa 2.110 2.209 0.099
ClNO Nitrosyl chloride rNCl 1.975 2.074 0.099
Si2H2 disilyne rSiSi 2.215 2.117 -0.098
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
N2 Nitrogen diatomic rNN 1.213 1.119 -0.094
BrNO Nitrosyl bromide rNBr 2.140 2.233 0.093
ClF3 Chlorine trifluoride rFCl 1.697 1.788 0.091
ClF3 Chlorine trifluoride rFCl 1.697 1.788 0.091
SiP Silicon monophosphide rSiP 2.078 1.987 -0.091
SiP Silicon monophosphide rSiP 2.078 1.988 -0.090
FSN Thiazyl fluoride rFS 1.643 1.733 0.090
VO Vanadium monoxide rVO 1.589 1.502 -0.088
ZnS Zinc sulfide rSZn 2.046 2.134 0.087
NaK Sodium Potassium rNaK 3.589 3.503 -0.086
CaO Calcium monoxide rOCa 1.822 1.907 0.085
CaO Calcium monoxide rOCa 1.822 1.907 0.085
Si2 Silicon diatomic rSiSi 2.246 2.163 -0.083
PS phosphorus sulfide rPS 1.900 1.817 -0.083
PS phosphorus sulfide rPS 1.900 1.817 -0.083
C2 Carbon diatomic rCC 1.243 1.323 0.080
C2 Carbon diatomic rCC 1.243 1.323 0.080
SeO3 selenium trioxide rSeO 1.688 1.609 -0.078
GaCl3 Gallium trichloride rClGa 2.180 2.107 -0.074
GaCl3 Gallium trichloride rClGa 2.180 2.107 -0.074
F2+ flourine diatomic cation rFF 1.322 1.395 0.073
F2+ flourine diatomic cation rFF 1.322 1.395 0.073
SeO Selenium monoxide rSeO 1.639 1.711 0.072
HNO2 Nitrous acid rNO 1.442 1.371 -0.071
ClOF3 Chlorine trifluoride oxide rFCl 1.713 1.783 0.070
SF Monosulfur monofluoride rSF 1.599 1.670 0.070
ONNO NO dimer rNN 2.236 2.166 -0.070
C2H2+ acetylene cation rCC 1.253 1.321 0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.192 -0.068
LiK Lithium Potassium rLiK 3.270 3.337 0.067
KrF2 Krypton difluoride rFKr 1.875 1.941 0.066
CH2ClCHCl2 1,1,2-trichloroethane rCC 1.580 1.515 -0.065
SOCl2 thionyl chloride rSCl 2.076 2.141 0.065
Fe(CO)5 Iron pentacarbonyl rCFe 1.824 1.759 -0.065
Li2 Lithium diatomic rLiLi 2.673 2.737 0.064
Li2 Lithium diatomic rLiLi 2.673 2.737 0.064
B2 Boron diatomic rBB 1.590 1.526 -0.064
B2 Boron diatomic rBB 1.590 1.526 -0.064
GaP Gallium monophosphide rPGa 2.110 2.047 -0.063
GaP Gallium monophosphide rPGa 2.110 2.047 -0.063
GaP Gallium monophosphide rPGa 2.110 2.047 -0.063
GaP Gallium monophosphide rPGa 2.110 2.047 -0.063
TiH Titanium monohydride rHTi 1.785 1.722 -0.063
C4H8O2 Ethyl acetate rCO 1.448 1.511 0.063
B4H10 Tetraborane(10) rHB 1.484 1.421 -0.063
BrF5 bromine pentafluoride rFBr 1.689 1.751 0.062
ScH Scandium monohydride rScH 1.775 1.714 -0.061
ClOOCl Dichlorine dioxide rOCl 1.704 1.765 0.061
IF Iodine monofluoride rFI 1.910 1.969 0.059
Se2 Selenium diatomic rSeSe 2.166 2.225 0.059
SO Sulfur monoxide rSO 1.481 1.539 0.058
SO Sulfur monoxide rSO 1.481 1.539 0.058
SO Sulfur monoxide rSO 1.481 1.539 0.058
SO Sulfur monoxide rSO 1.481 1.539 0.058
CH3CHNOH Acetaldoxime rCC 1.550 1.493 -0.057
LiCl- lithium chloride anion rLiCl 2.180 2.123 -0.057
B4H10 Tetraborane(10) rHB 1.315 1.258 -0.057
Si2H2 disilyne rSiH 1.668 1.725 0.057
BHCl2 Borane, dichloro- rBH 1.130 1.186 0.056
CH2SHCH2SH 1,2-Ethanedithiol rSH 1.400 1.344 -0.056
ClOOCl Dichlorine dioxide rOO 1.426 1.370 -0.056
CH3CHNOH Acetaldoxime rCC 1.550 1.495 -0.055
HCF Fluoromethylene rCH 1.138 1.085 -0.053
HCF Fluoromethylene rCH 1.138 1.085 -0.053
NaLi lithium sodium rLiNa 2.889 2.941 0.052
NaLi lithium sodium rLiNa 2.889 2.941 0.052
I2 Iodine diatomic rII 2.665 2.718 0.052
I2 Iodine diatomic rII 2.665 2.718 0.052
CuO Copper Monoxide rCuO 1.724 1.672 -0.052
ClF3 Chlorine trifluoride rFCl 1.697 1.749 0.052
ClF3 Chlorine trifluoride rFCl 1.697 1.749 0.052
C5H10 2-Pentene, (E)- rCC 1.576 1.524 -0.052
Na2Cl2 Disodium dichloride rNaCl 2.584 2.532 -0.052
As2 Arsenic diatomic rAsAs 2.103 2.154 0.051
C3H5 Allyl radical rCC 1.428 1.378 -0.050
C3H5 Allyl radical rCC 1.428 1.378 -0.050
210 molecules.