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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/cc-pVDZ

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C4H6 1-Methylcyclopropene rCH 1.085 4.251 3.166
C4H6 1-Methylcyclopropene rCH 1.087 3.438 2.351
Be2 Beryllium diatomic rBeBe 2.460 4.214 1.754
Mg2 Magnesium diatomic rMgMg 3.891 2.959 -0.932
C2H4O3 trioxolane124 rCN 1.303 2.183 0.880
C4H6 1-Methylcyclopropene rCC 1.476 2.273 0.797
C4H6 1-Methylcyclopropene rCH 1.087 1.845 0.758
HSSSH trisulfane rHS 1.344 2.088 0.745
HSSSH trisulfane rHS 1.344 2.088 0.745
HSSSH trisulfane rHS 1.344 2.087 0.744
HSSSH trisulfane rHS 1.344 2.087 0.744
S4 Sulfur tetramer rSS 2.155 2.898 0.743
CH3CH2SH ethanethiol rCH 1.095 1.832 0.737
CH3CH2SH ethanethiol rCH 1.095 1.832 0.737
CH3CH2SH ethanethiol rCH 1.095 1.829 0.734
C4H6 1-Methylcyclopropene rCH 1.098 1.792 0.694
C4H6 1-Methylcyclopropene rCH 1.098 1.774 0.676
S4 Sulfur tetramer rSS 2.155 2.744 0.589
S4 Sulfur tetramer rSS 2.155 2.743 0.588
CH3SO2NH2 methanesulfonamide rCN 1.207 1.702 0.495
C4H6 1-Methylcyclopropene rCH 1.070 1.519 0.449
CH3CH2SH ethanethiol rCH 1.089 1.527 0.438
CH3CH2SH ethanethiol rCH 1.089 1.527 0.438
CH3CH2SH ethanethiol rCH 1.089 1.525 0.436
CH3CH2SH ethanethiol rCH 1.092 1.527 0.435
CH3CH2SH ethanethiol rCH 1.092 1.527 0.435
CH3CH2SH ethanethiol rCH 1.092 1.525 0.433
C4H10O Methyl propyl ether rCC 1.530 1.103 -0.427
C2H4F2 1,2-difluoroethane rCH 1.093 1.517 0.424
C2H4F2 1,2-difluoroethane rCH 1.093 1.517 0.424
Be2 Beryllium diatomic rBeBe 2.460 2.037 -0.423
Be2 Beryllium diatomic rBeBe 2.460 2.037 -0.423
C4H6 1-Methylcyclopropene rCC 1.515 1.101 -0.414
C2H4F2 1,2-difluoroethane rCH 1.093 1.507 0.414
C2H4F2 1,2-difluoroethane rCH 1.093 1.507 0.414
GaP Gallium monophosphide rPGa 2.450 2.070 -0.380
GaP Gallium monophosphide rPGa 2.450 2.070 -0.380
GaP Gallium monophosphide rPGa 2.450 2.070 -0.380
GaP Gallium monophosphide rPGa 2.450 2.070 -0.380
CH2CHCH2F Allyl Fluoride rHC 1.130 1.500 0.370
CH2CHCH2F Allyl Fluoride rHC 1.130 1.498 0.368
Ne2 Neon diatomic rNeNe 3.100 2.741 -0.359
C3H3NO Isoxazole rCH 1.075 1.423 0.348
Ar2 Argon diatomic rArAr 3.758 4.093 0.335
Al2 Aluminum diatomic rAlAl 2.701 3.034 0.333
AlP Aluminum monophosphide rAlP 2.400 2.073 -0.327
AlP Aluminum monophosphide rAlP 2.400 2.073 -0.327
AlP Aluminum monophosphide rAlP 2.400 2.073 -0.327
C4H10O Methyl propyl ether rCH 1.099 1.410 0.311
CH3CH2SH ethanethiol rCC 1.528 1.832 0.304
CH3CH2SH ethanethiol rCC 1.528 1.832 0.304
CH3CH2SH ethanethiol rCC 1.528 1.829 0.301
CH3CH2SH ethanethiol rCS 1.820 1.525 -0.295
CH3CH2SH ethanethiol rCS 1.820 1.527 -0.293
CH3CH2SH ethanethiol rCS 1.820 1.527 -0.293
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.040 2.302 0.262
S4 Sulfur tetramer rSS 1.898 2.148 0.250
C2H2+ acetylene cation rCH 1.077 1.317 0.240
C4H6 1-Methylcyclopropene rCC 1.300 1.520 0.220
GaP Gallium monophosphide rPGa 2.450 2.236 -0.214
GaP Gallium monophosphide rPGa 2.450 2.236 -0.214
GaP Gallium monophosphide rPGa 2.450 2.236 -0.214
GaP Gallium monophosphide rPGa 2.450 2.236 -0.214
Si2H2 disilyne rSiSi 2.215 2.005 -0.210
Al2 Aluminum diatomic rAlAl 2.701 2.494 -0.207
Al2 Aluminum diatomic rAlAl 2.701 2.494 -0.207
Si2H2 disilyne rSiH 1.668 1.466 -0.202
S3 Sulfur trimer rSS 1.917 2.115 0.198
ClF3 Chlorine trifluoride rFCl 1.597 1.788 0.191
ClF3 Chlorine trifluoride rFCl 1.597 1.788 0.191
AlP Aluminum monophosphide rAlP 2.260 2.073 -0.187
AlP Aluminum monophosphide rAlP 2.260 2.073 -0.187
AlP Aluminum monophosphide rAlP 2.260 2.073 -0.187
B2 Boron diatomic rBB 1.590 1.407 -0.183
GaP Gallium monophosphide rPGa 2.250 2.070 -0.180
GaP Gallium monophosphide rPGa 2.250 2.070 -0.180
GaP Gallium monophosphide rPGa 2.250 2.070 -0.180
GaP Gallium monophosphide rPGa 2.250 2.070 -0.180
Ar2+ Argon diatomic cation rArAr 2.320 2.499 0.179
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
AlP Aluminum monophosphide rAlP 2.400 2.224 -0.176
Si2H2 disilyne rSiH 1.668 1.493 -0.175
GaP Gallium monophosphide rPGa 2.240 2.070 -0.170
GaP Gallium monophosphide rPGa 2.240 2.070 -0.170
GaP Gallium monophosphide rPGa 2.240 2.070 -0.170
GaP Gallium monophosphide rPGa 2.240 2.070 -0.170
CHF2CHF2 1,1,2,2-tetrafluoroethane rCF 1.359 1.519 0.160
Si2 Silicon diatomic rSiSi 2.246 2.093 -0.153
NO3 Nitrogen trioxide rNO 1.238 1.388 0.151
FO Oxygen monofluoride rFO 1.354 1.501 0.147
AlP Aluminum monophosphide rAlP 2.220 2.073 -0.147
AlP Aluminum monophosphide rAlP 2.220 2.073 -0.147
AlP Aluminum monophosphide rAlP 2.220 2.073 -0.147
Al2Cl6 Aluminum, di-μ-chlorotetrachlorodi- rAlCl 2.240 2.102 -0.138
ClNO2 Nitryl chloride rNCl 1.840 1.975 0.135
N2 Nitrogen diatomic rNN 1.098 1.229 0.132
N2 Nitrogen diatomic rNN 1.098 1.229 0.132
Na2 Sodium diatomic rNaNa 3.079 3.209 0.130
Na2 Sodium diatomic rNaNa 3.079 3.209 0.130
AlN Aluminum nitride rNAl 1.786 1.657 -0.129
GaP Gallium monophosphide rPGa 2.110 2.236 0.126
GaP Gallium monophosphide rPGa 2.110 2.236 0.126
GaP Gallium monophosphide rPGa 2.110 2.236 0.126
GaP Gallium monophosphide rPGa 2.110 2.236 0.126
F2+ flourine diatomic cation rFF 1.322 1.439 0.117
F2+ flourine diatomic cation rFF 1.322 1.439 0.117
ClOF3 Chlorine trifluoride oxide rFCl 1.603 1.714 0.111
FSN Thiazyl fluoride rFS 1.643 1.746 0.103
VO Vanadium monoxide rVO 1.589 1.487 -0.102
Si2H2 disilyne rSiSi 2.215 2.115 -0.100
BC boron monocarbide rBC 1.491 1.391 -0.100
Li2 Lithium diatomic rLiLi 2.673 2.772 0.099
NaLi lithium sodium rLiNa 2.889 2.982 0.093
NaLi lithium sodium rLiNa 2.889 2.982 0.093
BrNO Nitrosyl bromide rNBr 2.140 2.232 0.092
C2 Carbon diatomic rCC 1.243 1.334 0.092
C2 Carbon diatomic rCC 1.243 1.334 0.092
ClF3 Chlorine trifluoride rFCl 1.697 1.788 0.091
ClF3 Chlorine trifluoride rFCl 1.697 1.788 0.091
ClNO Nitrosyl chloride rNCl 1.975 2.064 0.089
ClNO Nitrosyl chloride rNCl 1.975 2.063 0.088
ONNO NO dimer rNN 2.236 2.148 -0.088
C2H2+ acetylene cation rCC 1.253 1.341 0.088
SO Sulfur monoxide rSO 1.481 1.566 0.085
SO Sulfur monoxide rSO 1.481 1.566 0.085
SO Sulfur monoxide rSO 1.481 1.566 0.085
SO Sulfur monoxide rSO 1.481 1.566 0.085
SeO Selenium monoxide rSeO 1.639 1.724 0.084
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
N2 Nitrogen diatomic rNN 1.213 1.129 -0.083
SO2F2 Sulfuryl fluoride rFS 1.530 1.607 0.077
ClOOCl Dichlorine dioxide rOCl 1.704 1.779 0.075
HClO4 perchloric acid rOCl 1.641 1.714 0.073
SOCl2 thionyl chloride rSCl 2.076 2.148 0.072
SeO3 selenium trioxide rSeO 1.688 1.616 -0.072
SiF+ silicon monofluoride cation rFSi 1.527 1.597 0.070
SiF+ silicon monofluoride cation rFSi 1.527 1.597 0.070
Si2H2 disilyne rSiSi 2.215 2.146 -0.070
AsN Arsenic mononitride rNAs 1.618 1.688 0.069
SiF3 Silicon trifluoride radical rFSi 1.565 1.634 0.069
N2O3 Dinitrogen trioxide rNN 1.864 1.932 0.068
F2SO Thionyl Fluoride rFS 1.585 1.653 0.067
BrF5 bromine pentafluoride rFBr 1.689 1.756 0.067
C4H8O2 Ethyl acetate rCO 1.448 1.515 0.067
SO+ sulfur monoxide cation rOS 1.424 1.490 0.066
SO+ sulfur monoxide cation rOS 1.424 1.490 0.066
S2N2 Disulfur dinitride rNS 1.642 1.708 0.066
SiP Silicon monophosphide rSiP 2.078 2.011 -0.066
SO Sulfur monoxide rOS 1.500 1.566 0.066
SO Sulfur monoxide rOS 1.500 1.566 0.066
SO Sulfur monoxide rOS 1.500 1.566 0.066
SO Sulfur monoxide rOS 1.500 1.566 0.066
AlO Aluminum monoxide rAlO 1.618 1.684 0.066
AlO Aluminum monoxide rAlO 1.618 1.684 0.066
BHCl2 Borane, dichloro- rBH 1.130 1.196 0.066
CaO Calcium monoxide rOCa 1.822 1.887 0.065
AlN Aluminum nitride rNAl 1.786 1.851 0.065
AlN Aluminum nitride rNAl 1.786 1.851 0.065
PS phosphorus sulfide rPS 1.900 1.836 -0.064
PS phosphorus sulfide rPS 1.900 1.836 -0.064
SiF2 Silicon difluoride rFSi 1.590 1.654 0.064
SiF2 Silicon difluoride rFSi 1.590 1.654 0.064
SOF4 Sulfur tetrafluoride oxide rFS 1.539 1.603 0.064
S2 Sulfur diatomic rSS 1.889 1.953 0.064
PF+ phosphorus monofluoride cation rFP 1.500 1.563 0.062
SiHF3 trifluorosilane rSiF 1.563 1.625 0.062
SiH2F2 difluorosilane rSiF 1.576 1.638 0.062
ClSSCl Disulfur dichloride rSS 1.931 1.993 0.062
PO- phosphorus monoxide anion rOP 1.540 1.601 0.061
SiF silicon monofluoride rSiF 1.604 1.666 0.061
SiF silicon monofluoride rSiF 1.604 1.666 0.061
SiP Silicon monophosphide rSiP 2.078 2.139 0.061
SO2 Sulfur dioxide rSO 1.432 1.493 0.061
SO2 Sulfur dioxide rSO 1.432 1.493 0.061
SSO Disulfur monoxide rSO 1.456 1.516 0.060
LiCl lithium chloride rLiCl 2.021 2.081 0.060
ClF3 Chlorine trifluoride rFCl 1.597 1.657 0.060
ClF3 Chlorine trifluoride rFCl 1.597 1.657 0.060
ClOF3 Chlorine trifluoride oxide rFCl 1.713 1.773 0.060
SSO Disulfur monoxide rSO 1.456 1.516 0.060
PF3 Phosphorus trifluoride rFP 1.561 1.620 0.059
S4 Sulfur tetramer rSS 1.898 1.957 0.059
S4 Sulfur tetramer rSS 1.898 1.957 0.059
Si2 Silicon diatomic rSiSi 2.246 2.187 -0.059
S2+ sulfur diatomic cation rSS 1.825 1.884 0.059
CH3OCl methyl hypochlorite rOCl 1.674 1.733 0.059
B2 Boron diatomic rBB 1.590 1.648 0.058
BeCl2 Beryllium chloride rBeCl 1.750 1.808 0.058
PN Phosphorus mononitride rPN 1.491 1.549 0.058
CH2ClCHCl2 1,1,2-trichloroethane rCC 1.580 1.522 -0.058
PN Phosphorus mononitride rPN 1.491 1.548 0.058
KrF2 Krypton difluoride rFKr 1.875 1.932 0.057
OClO Chlorine dioxide rClO 1.470 1.527 0.057
OClO Chlorine dioxide rClO 1.470 1.527 0.057
OClO Chlorine dioxide rClO 1.470 1.527 0.057
SF4 Sulfur tetrafluoride rSF 1.545 1.602 0.057
SF4 Sulfur tetrafluoride rSF 1.545 1.602 0.057
SiH3F monofluorosilane rSiF 1.595 1.652 0.057
SiH3F monofluorosilane rSiF 1.595 1.652 0.057
LiBr Lithium Bromide rLiBr 2.170 2.227 0.057
SSO Disulfur monoxide rSS 1.884 1.941 0.057
SSO Disulfur monoxide rSS 1.884 1.940 0.056
AlF Aluminum monofluoride rAlF 1.654 1.710 0.056
AlF Aluminum monofluoride rAlF 1.654 1.710 0.056
PF2 Phosphorus difluoride rPF 1.579 1.635 0.056
B4H10 Tetraborane(10) rHB 1.484 1.428 -0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
SO Sulfur monoxide rSO 1.481 1.537 0.056
PF phosphorus monofluoride rFP 1.593 1.648 0.056
HCO Formyl radical rCH 1.080 1.135 0.055
HCO Formyl radical rCH 1.080 1.135 0.055
Li2O dilithium oxide rLiO 1.606 1.661 0.055
Li2O dilithium oxide rLiO 1.606 1.661 0.055
HCO Formyl radical rCH 1.080 1.134 0.054
Si2H2 disilyne rSiH 1.668 1.722 0.054
PF5 Phosphorus pentafluoride rPF 1.534 1.588 0.054
CH3CHNOH Acetaldoxime rCC 1.550 1.496 -0.054
SF2 sulfur difluoride rSF 1.587 1.641 0.054
SF2 sulfur difluoride rSF 1.587 1.641 0.054
LiS Lithium monosulfide rLiS 2.150 2.203 0.053
P2 Phosphorus diatomic rPP 1.893 1.947 0.053
P2 Phosphorus diatomic rPP 1.893 1.947 0.053
CH2SHCH2SH 1,2-Ethanedithiol rSH 1.400 1.347 -0.053
CaBr Calcium monobromide rCaBr 2.594 2.646 0.053
HN3 hydrogen azide rNH 0.975 1.028 0.053
HClO4 perchloric acid rOCl 1.404 1.456 0.052
HN3 hydrogen azide rNH 0.975 1.027 0.052
AlNC Aluminum isocyanide rAlN 1.855 1.907 0.052
OPCl Phosphorus oxychloride rPCl 2.059 2.111 0.052
SO3 Sulfur trioxide rSO 1.418 1.469 0.052
NS+ nitrogen sulfide cation rNS 1.440 1.492 0.052
SO3 Sulfur trioxide rSO 1.418 1.469 0.052
GaCl3 Gallium trichloride rClGa 2.180 2.128 -0.052
GaCl3 Gallium trichloride rClGa 2.180 2.128 -0.052
BrF3 Bromine trifluoride rFBr 1.721 1.773 0.052
SiO Silicon monoxide rSiO 1.510 1.561 0.052
SiO Silicon monoxide rSiO 1.510 1.561 0.051
AsF5 Arsenic pentafluoride rAsF 1.656 1.707 0.051
CaS Calcium sulfide rSCa 2.318 2.369 0.051
ClF Chlorine monofluoride rFCl 1.628 1.679 0.051
ClF Chlorine monofluoride rFCl 1.628 1.679 0.051
O2 Oxygen diatomic rOO 1.208 1.258 0.050
CH3CHNOH Acetaldoxime rCC 1.550 1.500 -0.050
As2 Arsenic diatomic rAsAs 2.103 2.153 0.050
AlF3 Aluminum trifluoride rAlF 1.630 1.680 0.050
AlF3 Aluminum trifluoride rAlF 1.630 1.680 0.050
262 molecules.