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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 MP2/6-311G**

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.226 3.141
C4H6 1-Methylcyclopropene rCH 1.087 3.421 2.334
Be2 Beryllium diatomic rBeBe 2.460 4.074 1.614
FOO Dioxygen monofluoride radical rFO 1.649 2.720 1.071
C2H4O3 trioxolane124 rCN 1.303 2.176 0.873
C4H6 1-Methylcyclopropene rCC 1.476 2.261 0.785
C4H6 1-Methylcyclopropene rCH 1.087 1.833 0.746
HSSSH trisulfane rHS 1.344 2.077 0.733
HSSSH trisulfane rHS 1.344 2.077 0.733
HSSSH trisulfane rHS 1.344 2.077 0.733
HSSSH trisulfane rHS 1.344 2.077 0.733
CH3CH2SH ethanethiol rCH 1.095 1.822 0.727
CH3CH2SH ethanethiol rCH 1.095 1.822 0.727
CH3CH2SH ethanethiol rCH 1.095 1.818 0.723
S4 Sulfur tetramer rSS 2.155 2.872 0.717
C4H6 1-Methylcyclopropene rCH 1.098 1.781 0.683
C4H6 1-Methylcyclopropene rCH 1.098 1.764 0.666
S4 Sulfur tetramer rSS 2.155 2.787 0.632
Ar2 Argon diatomic rArAr 3.758 4.352 0.594
Mg2 Magnesium diatomic rMgMg 3.891 4.396 0.506
Mg2 Magnesium diatomic rMgMg 3.891 4.396 0.506
CH3SO2NH2 methanesulfonamide rCN 1.207 1.675 0.468
C4H4N2 Succinonitrile rCC 1.561 1.093 -0.468
C4H6 1-Methylcyclopropene rCH 1.070 1.512 0.442
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
C4H10O Methyl propyl ether rCC 1.530 1.095 -0.435
CH3CH2SH ethanethiol rCH 1.089 1.524 0.435
Be2 Beryllium diatomic rBeBe 2.460 2.027 -0.433
Be2 Beryllium diatomic rBeBe 2.460 2.027 -0.433
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
CH3CH2SH ethanethiol rCH 1.092 1.524 0.432
C4H6 1-Methylcyclopropene rCC 1.515 1.092 -0.423
C2H4F2 1,2-difluoroethane rCH 1.093 1.515 0.422
C4H4N2 Succinonitrile rCH 1.123 1.543 0.420
C2H4F2 1,2-difluoroethane rCH 1.093 1.504 0.411
GaP Gallium monophosphide rPGa 2.450 2.068 -0.382
GaP Gallium monophosphide rPGa 2.450 2.068 -0.382
GaP Gallium monophosphide rPGa 2.450 2.068 -0.382
GaP Gallium monophosphide rPGa 2.450 2.068 -0.382
CH2CHCH2F Allyl Fluoride rHC 1.130 1.498 0.368
CH2CHCH2F Allyl Fluoride rHC 1.130 1.495 0.365
C4H4N2 Succinonitrile rCH 1.111 1.464 0.353
AlP Aluminum monophosphide rAlP 2.400 2.048 -0.352
AlP Aluminum monophosphide rAlP 2.400 2.048 -0.352
AlP Aluminum monophosphide rAlP 2.400 2.048 -0.352
C3H3NO Isoxazole rCH 1.075 1.418 0.343
C4H10O Methyl propyl ether rCH 1.099 1.409 0.310
CH3CH2SH ethanethiol rCS 1.820 1.524 -0.296
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
CH3CH2SH ethanethiol rCC 1.528 1.822 0.294
CH3CH2SH ethanethiol rCC 1.528 1.822 0.294
Al2 Aluminum diatomic rAlAl 2.701 2.991 0.290
CH3CH2SH ethanethiol rCC 1.528 1.818 0.290
Ne2 Neon diatomic rNeNe 3.100 2.820 -0.280
S4 Sulfur tetramer rSS 1.898 2.132 0.234
Si2H2 disilyne rSiSi 2.215 1.982 -0.234
C2H2+ acetylene cation rCH 1.077 1.309 0.232
GaP Gallium monophosphide rPGa 2.450 2.233 -0.217
GaP Gallium monophosphide rPGa 2.450 2.233 -0.217
GaP Gallium monophosphide rPGa 2.450 2.233 -0.217
GaP Gallium monophosphide rPGa 2.450 2.233 -0.217
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.256 0.216
C4H6 1-Methylcyclopropene rCC 1.300 1.515 0.215
Si2H2 disilyne rSiH 1.668 1.454 -0.214
AlP Aluminum monophosphide rAlP 2.260 2.048 -0.212
AlP Aluminum monophosphide rAlP 2.260 2.048 -0.212
AlP Aluminum monophosphide rAlP 2.260 2.048 -0.212
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
AlP Aluminum monophosphide rAlP 2.400 2.193 -0.207
B2 Boron diatomic rBB 1.590 1.387 -0.203
ClF3 Chlorine trifluoride rFCl 1.597 1.790 0.193
ClF3 Chlorine trifluoride rFCl 1.597 1.790 0.193
Si2H2 disilyne rSiH 1.668 1.481 -0.187
S3 Sulfur trimer rSS 1.917 2.103 0.186
GaP Gallium monophosphide rPGa 2.250 2.068 -0.182
GaP Gallium monophosphide rPGa 2.250 2.068 -0.182
GaP Gallium monophosphide rPGa 2.250 2.068 -0.182
GaP Gallium monophosphide rPGa 2.250 2.068 -0.182
Si2 Silicon diatomic rSiSi 2.246 2.066 -0.180
GaP Gallium monophosphide rPGa 2.240 2.068 -0.172
GaP Gallium monophosphide rPGa 2.240 2.068 -0.172
GaP Gallium monophosphide rPGa 2.240 2.068 -0.172
GaP Gallium monophosphide rPGa 2.240 2.068 -0.172
AlP Aluminum monophosphide rAlP 2.220 2.048 -0.172
AlP Aluminum monophosphide rAlP 2.220 2.048 -0.172
AlP Aluminum monophosphide rAlP 2.220 2.048 -0.172
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.070 -0.170
Ar2+ Argon diatomic cation rArAr 2.320 2.484 0.164
CHF2CHF2 1,1,2,2-tetrafluoroethane rCF 1.359 1.518 0.159
AlN Aluminum nitride rNAl 1.786 1.636 -0.151
FO Oxygen monofluoride rFO 1.354 1.498 0.144
NO3 Nitrogen trioxide rNO 1.238 1.381 0.143
N2 Nitrogen diatomic rNN 1.098 1.224 0.126
N2 Nitrogen diatomic rNN 1.098 1.224 0.126
GaP Gallium monophosphide rPGa 2.110 2.233 0.123
GaP Gallium monophosphide rPGa 2.110 2.233 0.123
GaP Gallium monophosphide rPGa 2.110 2.233 0.123
GaP Gallium monophosphide rPGa 2.110 2.233 0.123
ClNO2 Nitryl chloride rNCl 1.840 1.957 0.117
Si2H2 disilyne rSiSi 2.215 2.099 -0.117
ClFO3 Perchloryl fluoride rFCl 1.598 1.714 0.116
BC boron monocarbide rBC 1.491 1.385 -0.106
ClOF3 Chlorine trifluoride oxide rFCl 1.603 1.708 0.105
ClNO Nitrosyl chloride rNCl 1.975 2.077 0.102
ClNO Nitrosyl chloride rNCl 1.975 2.077 0.102
NaO sodium monoxide rONa 2.052 1.952 -0.100
NaO sodium monoxide rONa 2.052 1.952 -0.100
BrNO Nitrosyl bromide rNBr 2.140 2.236 0.096
Si2H2 disilyne rSiSi 2.215 2.119 -0.096
ClF3 Chlorine trifluoride rFCl 1.697 1.790 0.093
ClF3 Chlorine trifluoride rFCl 1.697 1.790 0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
N2 Nitrogen diatomic rNN 1.213 1.120 -0.093
FSN Thiazyl fluoride rFS 1.643 1.733 0.090
SiP Silicon monophosphide rSiP 2.078 1.988 -0.090
Na2 Sodium diatomic rNaNa 3.079 3.168 0.089
Na2 Sodium diatomic rNaNa 3.079 3.168 0.089
SiP Silicon monophosphide rSiP 2.078 1.989 -0.089
ZnS Zinc sulfide rSZn 2.046 2.135 0.089
CaO Calcium monoxide rOCa 1.822 1.908 0.086
CaO Calcium monoxide rOCa 1.822 1.908 0.086
VO Vanadium monoxide rVO 1.589 1.505 -0.084
PS phosphorus sulfide rPS 1.900 1.817 -0.083
PS phosphorus sulfide rPS 1.900 1.817 -0.083
Si2 Silicon diatomic rSiSi 2.246 2.164 -0.082
C2 Carbon diatomic rCC 1.243 1.324 0.081
C2 Carbon diatomic rCC 1.243 1.324 0.081
NaLi lithium sodium rLiNa 2.889 2.970 0.081
NaLi lithium sodium rLiNa 2.889 2.970 0.081
SeO3 selenium trioxide rSeO 1.688 1.609 -0.079
C2H2+ acetylene cation rCC 1.253 1.329 0.077
LiK Lithium Potassium rLiK 3.270 3.346 0.076
Li2 Lithium diatomic rLiLi 2.673 2.748 0.075
Li2 Lithium diatomic rLiLi 2.673 2.748 0.075
F2+ flourine diatomic cation rFF 1.322 1.397 0.075
F2+ flourine diatomic cation rFF 1.322 1.397 0.075
SeO Selenium monoxide rSeO 1.639 1.712 0.073
ClOF3 Chlorine trifluoride oxide rFCl 1.713 1.785 0.072
NS Mononitrogen monosulfide rNS 1.497 1.429 -0.068
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
AlP Aluminum monophosphide rAlP 2.260 2.193 -0.067
SOCl2 thionyl chloride rSCl 2.076 2.143 0.067
KrF2 Krypton difluoride rFKr 1.875 1.941 0.066
C4H8O2 Ethyl acetate rCO 1.448 1.514 0.066
B4H10 Tetraborane(10) rHB 1.484 1.419 -0.065
Se2 Selenium diatomic rSeSe 2.166 2.231 0.065
CH2SHCH2SH 1,2-Ethanedithiol rSH 1.400 1.336 -0.064
As2 Arsenic diatomic rAsAs 2.103 2.166 0.063
BrF5 bromine pentafluoride rFBr 1.689 1.752 0.063
B2 Boron diatomic rBB 1.590 1.528 -0.062
B2 Boron diatomic rBB 1.590 1.528 -0.062
CH2ClCHCl2 1,1,2-trichloroethane rCC 1.580 1.518 -0.062
ClOOCl Dichlorine dioxide rOCl 1.704 1.766 0.062
ONNO NO dimer rNN 2.236 2.176 -0.060
GaAs Gallium arsenide rGaAs 2.530 2.590 0.060
GaAs Gallium arsenide rGaAs 2.530 2.590 0.060
B4H10 Tetraborane(10) rHB 1.315 1.256 -0.059
AsN Arsenic mononitride rNAs 1.618 1.677 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
SO Sulfur monoxide rSO 1.481 1.540 0.059
NaK Sodium Potassium rNaK 3.589 3.532 -0.057
CuH Copper monohydride rCuH 1.463 1.408 -0.055
CuH Copper monohydride rCuH 1.463 1.408 -0.055
CH3CHNOH Acetaldoxime rCC 1.550 1.495 -0.055
ClOOCl Dichlorine dioxide rOO 1.426 1.371 -0.055
GaCl3 Gallium trichloride rClGa 2.180 2.126 -0.054
GaCl3 Gallium trichloride rClGa 2.180 2.126 -0.054
ClF3 Chlorine trifluoride rFCl 1.697 1.750 0.053
ClF3 Chlorine trifluoride rFCl 1.697 1.750 0.053
HCF Fluoromethylene rCH 1.138 1.085 -0.053
GeF Germanium monofluoride rFGe 1.745 1.797 0.052
GeF Germanium monofluoride rFGe 1.745 1.797 0.052
HClO4 perchloric acid rOCl 1.641 1.693 0.052
CH3CHNOH Acetaldoxime rCC 1.550 1.498 -0.052
BHCl2 Borane, dichloro- rBH 1.130 1.182 0.052
CaS Calcium sulfide rSCa 2.318 2.368 0.050
195 molecules.