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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(T)/6-31G*

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
CH3CH2OH Ethanol rOH 0.971 3.340 2.369
CH3NHCH3 Dimethylamine rCH 1.084 3.367 2.283
HClO4 perchloric acid rOH 0.980 3.258 2.278
H2SO4 Sulfuric acid rOH 0.970 2.858 1.888
MgOH magnesium hydroxide rOH 0.940 2.603 1.663
MgOH magnesium hydroxide rOH 0.940 2.603 1.663
CH3CH2NH2 Ethylamine rNH 1.052 2.693 1.641
C2H5N Aziridine rCH 1.084 2.238 1.154
C2H5N Aziridine rCH 1.083 2.220 1.137
Mg2 Magnesium diatomic rMgMg 3.891 4.760 0.870
S4 Sulfur tetramer rSS 2.155 2.901 0.746
HSSSH trisulfane rHS 1.344 2.086 0.742
HSSSH trisulfane rHS 1.344 2.086 0.742
HSSSH trisulfane rHS 1.344 2.085 0.742
HSSSH trisulfane rHS 1.344 2.085 0.742
CH3CH2SH ethanethiol rCH 1.095 1.835 0.740
CH3CH2SH ethanethiol rCH 1.095 1.835 0.740
CH3CH2SH ethanethiol rCH 1.095 1.832 0.737
C2H5N Aziridine rCC 1.481 2.058 0.577
S4 Sulfur tetramer rSS 2.155 2.690 0.535
Ne2 Neon diatomic rNeNe 3.100 2.594 -0.506
CH3SO2NH2 methanesulfonamide rCN 1.207 1.693 0.486
C2H5N Aziridine rNH 1.016 1.481 0.465
CH3CH2SH ethanethiol rCH 1.089 1.529 0.440
CH3CH2SH ethanethiol rCH 1.089 1.529 0.440
CH3CH2SH ethanethiol rCH 1.089 1.527 0.438
Ar2 Argon diatomic rArAr 3.758 4.195 0.437
CH3CH2SH ethanethiol rCH 1.092 1.529 0.437
CH3CH2SH ethanethiol rCH 1.092 1.529 0.437
Be2 Beryllium diatomic rBeBe 2.460 2.024 -0.436
CH3CH2SH ethanethiol rCH 1.092 1.527 0.435
C4H10O Methyl propyl ether rCC 1.530 1.099 -0.431
C2H4F2 1,2-difluoroethane rCH 1.093 1.517 0.424
C2H4F2 1,2-difluoroethane rCH 1.093 1.517 0.424
C2H4F2 1,2-difluoroethane rCH 1.093 1.507 0.414
C2H4F2 1,2-difluoroethane rCH 1.093 1.507 0.414
FOO Dioxygen monofluoride radical rFO 1.649 1.235 -0.414
FOO Dioxygen monofluoride radical rOO 1.200 1.580 0.380
CH2CHCH2F Allyl Fluoride rHC 1.130 1.502 0.372
CH2CHCH2F Allyl Fluoride rHC 1.130 1.499 0.369
C3H3NO Isoxazole rCH 1.075 1.429 0.354
GaP Gallium monophosphide rPGa 2.450 2.129 -0.321
GaP Gallium monophosphide rPGa 2.450 2.129 -0.321
GaP Gallium monophosphide rPGa 2.450 2.129 -0.321
GaP Gallium monophosphide rPGa 2.450 2.129 -0.321
C4H10O Methyl propyl ether rCH 1.099 1.419 0.320
CH3CH2SH ethanethiol rCC 1.528 1.835 0.307
CH3CH2SH ethanethiol rCC 1.528 1.835 0.307
CH3CH2SH ethanethiol rCC 1.528 1.832 0.304
CH3CH2SH ethanethiol rCS 1.820 1.527 -0.293
CH3CH2SH ethanethiol rCS 1.820 1.529 -0.291
CH3CH2SH ethanethiol rCS 1.820 1.529 -0.291
HClO4 perchloric acid rOCl 1.414 1.701 0.287
AlP Aluminum monophosphide rAlP 2.400 2.114 -0.286
AlP Aluminum monophosphide rAlP 2.400 2.114 -0.286
AlP Aluminum monophosphide rAlP 2.400 2.114 -0.286
Al2 Aluminum diatomic rAlAl 2.701 2.965 0.264
S4 Sulfur tetramer rSS 1.898 2.147 0.249
C2H2+ acetylene cation rCH 1.077 1.316 0.239
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.272 0.232
CaS Calcium sulfide rSCa 2.318 2.533 0.215
Si2H2 disilyne rSiSi 2.215 2.001 -0.215
Al2 Aluminum diatomic rAlAl 2.701 2.493 -0.208
Al2 Aluminum diatomic rAlAl 2.701 2.493 -0.208
Ar2+ Argon diatomic cation rArAr 2.320 2.526 0.206
K2 Potassium diatomic rKK 3.905 4.110 0.205
GaP Gallium monophosphide rPGa 2.450 2.255 -0.195
GaP Gallium monophosphide rPGa 2.450 2.255 -0.195
GaP Gallium monophosphide rPGa 2.450 2.255 -0.195
GaP Gallium monophosphide rPGa 2.450 2.255 -0.195
Si2H2 disilyne rSiH 1.668 1.474 -0.194
S3 Sulfur trimer rSS 1.917 2.106 0.189
CuCl Copper monochloride rCuCl 2.051 1.863 -0.188
HClO4 perchloric acid rOCl 1.641 1.457 -0.184
ClF3 Chlorine trifluoride rFCl 1.597 1.769 0.173
ClF3 Chlorine trifluoride rFCl 1.597 1.769 0.173
Si2H2 disilyne rSiH 1.668 1.501 -0.167
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 1.517 0.158
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.084 -0.156
CuF Copper monofluoride rCuF 1.745 1.590 -0.155
CaH Calcium monohydride rCaH 2.003 2.154 0.152
CaH Calcium monohydride rCaH 2.003 2.154 0.152
Be2 Beryllium diatomic rBeBe 2.460 2.611 0.151
Si2 Silicon diatomic rSiSi 2.246 2.096 -0.150
AlP Aluminum monophosphide rAlP 2.260 2.114 -0.146
AlP Aluminum monophosphide rAlP 2.260 2.114 -0.146
AlP Aluminum monophosphide rAlP 2.260 2.114 -0.146
GaP Gallium monophosphide rPGa 2.110 2.255 0.145
GaP Gallium monophosphide rPGa 2.110 2.255 0.145
GaP Gallium monophosphide rPGa 2.110 2.255 0.145
GaP Gallium monophosphide rPGa 2.110 2.255 0.145
N2 Nitrogen diatomic rNN 1.098 1.233 0.135
N2 Nitrogen diatomic rNN 1.098 1.233 0.135
CuH Copper monohydride rCuH 1.463 1.329 -0.134
CuH Copper monohydride rCuH 1.463 1.329 -0.134
CaCl calcium monochloride rClCa 2.437 2.569 0.132
GaP Gallium monophosphide rPGa 2.250 2.129 -0.121
GaP Gallium monophosphide rPGa 2.250 2.129 -0.121
GaP Gallium monophosphide rPGa 2.250 2.129 -0.121
GaP Gallium monophosphide rPGa 2.250 2.129 -0.121
S4 Sulfur tetramer rSS 2.155 2.273 0.118
HCO Formyl radical rCH 1.080 1.195 0.115
HCO Formyl radical rCH 1.080 1.195 0.115
GaP Gallium monophosphide rPGa 2.240 2.129 -0.111
GaP Gallium monophosphide rPGa 2.240 2.129 -0.111
GaP Gallium monophosphide rPGa 2.240 2.129 -0.111
GaP Gallium monophosphide rPGa 2.240 2.129 -0.111
NaO sodium monoxide rONa 2.052 1.944 -0.108
NaO sodium monoxide rONa 2.052 1.944 -0.108
AlP Aluminum monophosphide rAlP 2.220 2.114 -0.106
AlP Aluminum monophosphide rAlP 2.220 2.114 -0.106
AlP Aluminum monophosphide rAlP 2.220 2.114 -0.106
KH Potassium hydride rKH 2.243 2.347 0.105
KH Potassium hydride rKH 2.243 2.347 0.105
CO Carbon monoxide rCO 1.128 1.229 0.101
CaOH Calcium monohydroxide rOCa 1.976 2.076 0.100
LiK Lithium Potassium rLiK 3.270 3.369 0.099
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
N2 Nitrogen diatomic rNN 1.213 1.120 -0.092
Na2 Sodium diatomic rNaNa 3.079 3.164 0.086
Na2 Sodium diatomic rNaNa 3.079 3.164 0.085
Na2 Sodium diatomic rNaNa 3.079 3.164 0.085
C2 Carbon diatomic rCC 1.243 1.328 0.085
C2 Carbon diatomic rCC 1.243 1.328 0.085
CuO Copper Monoxide rCuO 1.724 1.639 -0.085
Si2H2 disilyne rSiSi 2.215 2.131 -0.084
He2+ helium diatomic cation rHeHe 1.081 1.163 0.083
He2+ helium diatomic cation rHeHe 1.081 1.163 0.083
Si2H2 disilyne rSiSi 2.215 2.136 -0.079
CaF Calcium monofluoride rFCa 1.967 2.044 0.077
KCl Potassium Chloride rKCl 2.667 2.743 0.076
NBr nitrogen monobromide rNBr 1.765 1.840 0.075
Si2H2 disilyne rSiH 1.668 1.742 0.074
ClF3 Chlorine trifluoride rFCl 1.697 1.769 0.073
ClF3 Chlorine trifluoride rFCl 1.697 1.769 0.073
ClOF3 Chlorine trifluoride oxide rFCl 1.603 1.676 0.073
ClOOCl Dichlorine dioxide rOCl 1.704 1.776 0.072
HCO Formyl radical rCO 1.198 1.128 -0.070
HCO Formyl radical rCO 1.198 1.128 -0.070
KrF2 Krypton difluoride rFKr 1.875 1.945 0.070
C4H8O2 Ethyl acetate rCO 1.448 1.517 0.069
LiO lithium oxide rLiO 1.688 1.619 -0.069
LiO lithium oxide rLiO 1.688 1.619 -0.069
BrO Bromine monoxide rOBr 1.718 1.786 0.069
TiH Titanium monohydride rHTi 1.785 1.853 0.068
B4H10 Tetraborane(10) rHB 1.484 1.416 -0.068
OClO Chlorine dioxide rClO 1.470 1.537 0.067
OClO Chlorine dioxide rClO 1.470 1.537 0.067
SiP Silicon monophosphide rSiP 2.078 2.013 -0.064
NaLi lithium sodium rLiNa 2.889 2.953 0.064
NaLi lithium sodium rLiNa 2.889 2.953 0.064
Si2 Silicon diatomic rSiSi 2.246 2.182 -0.064
C2H2+ acetylene cation rCC 1.253 1.317 0.064
BrO+ Bromine monoxide cation rOBr 1.635 1.699 0.064
ClSSCl Disulfur dichloride rSS 1.931 1.995 0.064
HClO4 perchloric acid rOCl 1.404 1.468 0.064
HClO4 perchloric acid rOCl 1.404 1.467 0.063
SeO3 selenium trioxide rSeO 1.688 1.625 -0.063
CH3OCl methyl hypochlorite rOCl 1.674 1.737 0.063
Se2 Selenium diatomic rSeSe 2.166 2.227 0.061
Li2 Lithium diatomic rLiLi 2.673 2.734 0.061
Li2 Lithium diatomic rLiLi 2.673 2.733 0.060
SO Sulfur monoxide rSO 1.481 1.541 0.060
SO Sulfur monoxide rSO 1.481 1.541 0.060
SO Sulfur monoxide rSO 1.481 1.541 0.060
SO Sulfur monoxide rSO 1.481 1.541 0.060
BHCl2 Borane, dichloro- rBH 1.130 1.189 0.059
B2 Boron diatomic rBB 1.590 1.531 -0.059
HClO4 perchloric acid rOCl 1.641 1.700 0.059
LiH Lithium Hydride rLiH 1.595 1.654 0.059
LiH Lithium Hydride rLiH 1.595 1.654 0.059
B2 Boron diatomic rBB 1.590 1.531 -0.059
B4H10 Tetraborane(10) rHB 1.315 1.257 -0.058
CaBr2 Calcium dibromide rCaBr 2.616 2.673 0.057
CH3CH2NH2 Ethylamine rCC 1.531 1.474 -0.057
SiC silicon monocarbide rCSi 1.722 1.665 -0.057
SiC silicon monocarbide rCSi 1.722 1.665 -0.057
ClS2 Sulfur chloride rSCl 2.071 2.128 0.057
BrF5 bromine pentafluoride rFBr 1.689 1.745 0.056
KOH Potassium hydroxide rOH 0.912 0.968 0.056
SeO Selenium monoxide rSeO 1.639 1.695 0.056
Ne2+ Neon diatomic cation rNeNe 1.765 1.710 -0.055
S2 Sulfur diatomic rSS 1.889 1.944 0.054
ClOF3 Chlorine trifluoride oxide rOCl 1.405 1.459 0.054
NCl nitrogen monochloride rNCl 1.611 1.665 0.054
SO2F2 Sulfuryl fluoride rFS 1.530 1.584 0.054
ClF3 Chlorine trifluoride rFCl 1.597 1.650 0.054
ClF3 Chlorine trifluoride rFCl 1.597 1.650 0.054
GeF+ Germanium monofluoride cation rFGe 1.665 1.719 0.053
Br2 Bromine diatomic rBrBr 2.281 2.334 0.053
Br2 Bromine diatomic rBrBr 2.281 2.334 0.053
BrCl Bromine monochloride rClBr 2.136 2.189 0.053
BrCl Bromine monochloride rClBr 2.136 2.189 0.053
NaH sodium hydride rNaH 1.887 1.939 0.052
NaH sodium hydride rNaH 1.887 1.939 0.052
SOCl2 thionyl chloride rSCl 2.076 2.128 0.052
TiCl Titanium Monochloride rClTi 2.265 2.316 0.052
HN3 hydrogen azide rNH 0.975 1.027 0.052
HN3 hydrogen azide rNH 0.975 1.027 0.052
FSSF Difluorodisulfane rSS 1.890 1.941 0.051
CH3CH2NH2 Ethylamine rCN 1.475 1.526 0.051
Cl2 Chlorine diatomic rClCl 1.988 2.039 0.051
SOF4 Sulfur tetrafluoride oxide rFS 1.539 1.590 0.051
H2SO4 Sulfuric acid rSO 1.574 1.624 0.050
Cl2 Chlorine diatomic rClCl 1.988 2.038 0.050
MgH+ magnesium monohydride cation rMgH 1.652 1.702 0.050
216 molecules.