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XVIII.A.4.

Molecules with the most calculations producing poor bond lengths

The following table lists molecules sorted by how many calculations produced bond lengths that differ from experiment by more than 0.050 Å.
Click on a name for a table of bond length comparisons.
molecule name poor calculations bond description
NaK Sodium Potassium 135 rNaK
ClFO3 Perchloryl fluoride 124 rFCl
BrO Bromine monoxide 119 rOBr
PCl5 Phosphorus pentachloride 118 rPCl
BrF5 bromine pentafluoride 116 rFBr
CaF Calcuium monofluoride 106 rFCa
KCl Potassium Chloride 106 rKCl
CaOH Calcium monohydroxide 104 rOCa
CuF Copper monofluoride 102 rCuF
ClF3 Chlorine trifluoride 97 rFCl
SF4 Sulfur tetrafluoride 95 rSF
CuO Copper Monoxide 89 rCuO
KH Potassium hydride 88 rHK
CuCl Copper monochloride 87 rCuCl
BrF3 Bromine trifluoride 85 rFBr
SiF2 Silicon difluoride 82 rFSi
LiO lithium oxide 81 rLiO
AlN Aluminum nitride 80 rNAl
CHF2Cl difluorochloromethane 77 rCCl
ClFO3 Perchloryl fluoride 76 rClO
Cu2 Copper dimer 75 rCuCu
SF4 Sulfur tetrafluoride 75 rSF
H2+ Hydrogen cation 73 rHH
CH3ONO Methyl nitrite 73 rNO
CCl2 dichloromethylene 73 rCCl
ClF3 Chlorine trifluoride 72 rFCl
BrCl Bromine monochloride 70 rClBr
CH3NO3 Methyl nitrate 68 rNO
SCl sulfur monochloride 67 rSCl
Se2 Selenium diatomic 66 rSeSe
PCl5 Phosphorus pentachloride 66 rPCl
SSO Disulfur monoxide 66 rSS
NS Mononitrogen monosulfide 66 rNS
CH2FCl fluorochloromethane 65 rCCl
HOCl hypochlorous acid 64 rClO
ClF Chlorine monofluoride 64 rFCl
SeO Selenium monoxide 62 rSeO
CH2O2 Dioxirane 62 rOO
Br2 Bromine diatomic 61 rBrBr
C2H6O2S Dimethyl sulfone 60 rSO
SSO Disulfur monoxide 60 rSO
HOBr Hypobromous acid 60 rBrO
PF5 Phosphorus pentafluoride 59 rPF
BrF Bromine monofluoride 59 rFBr
HNO3 Nitric acid 58 rNO
CH2O2 Dioxirane 58 rCO
BrF3 Bromine trifluoride 57 rFBr
C5H10 2-Pentene, (E)- 56 rCC
SeO2 Selenium dioxide 56 rSeO
SeS Selenium monosulfide 56 rSSe
HO2 Hydroperoxy radical 55 rOO
PCl phosphorus chloride 55 rPCl
LiCl lithium chloride 54 rLiCl
SiH2Cl2 dichlorosilane 54 rSiCl
SOCl2 thionyl chloride 54 rSO
SiH3F monofluorosilane 53 rSiF
PO2 Phosphorus dioxide 53 rPO
CH3COCl Acetyl Chloride 52 rCCl
C2Cl2 dichloroacetylene 52 rCCl
BrF5 bromine pentafluoride 51 rFBr
SiHCl3 Trichlorosilane 50 rSiCl
CH3Br methyl bromide 49 rCBr
C2H6O2S Dimethyl sulfone 48 rCS
CCl2O Phosgene 46 rCCl
N2O3 Dinitrogen trioxide 44 rNO
FO Oxygen monofluoride 44 rFO
SiF4 Silicon tetrafluoride 43 rSiF
CH2ClCH2Cl Ethane, 1,2-dichloro- 43 rCCl
SiH3Cl chlorosilane 42 rSiCl
I2 Iodine diatomic 42 rII
OH- hydroxide anion 40 rOH
N2O3 Dinitrogen trioxide 39 rNO
CH3SCH2CH3 Ethane, (methylthio)- 39 rCS
ClCN chlorocyanogen 38 rCCl
PF5 Phosphorus pentafluoride 38 rPF
CFCl3 Trichloromonofluoromethane 38 rCCl
C5H6 Bicyclo[2.1.0]pent-2-ene 37 rCC
CHClCCl2 Trichloroethylene 37 rCCl
CHClCCl2 Trichloroethylene 37 rCCl
CH2Br2 dibromomethane 36 rCBr
C4H8O2 Ethyl acetate 35 rCO
CH3I methyl iodide 35 rCI
CHBr3 bromoform 33 rCBr
BF Boron monofluoride 32 rBF
CH3SCH2CH3 Ethane, (methylthio)- 31 rCS
CH3ONO Methyl nitrite 29 rNO
N2O3 Dinitrogen trioxide 28 rNO
C2Cl2 dichloroacetylene 28 rCC
C5H8 Bicyclo[2.1.0]pentane 28 rCC
CBr4 Carbon tetrabromide 28 rCBr
HF+ hydrogen fluoride cation 26 rHF
MgOH magnesium hydroxide 25 rMgO
CH2C(CH3)OCH3 1-Propene, 2-methoxy- 25 rCO
CaOH Calcium monohydroxide 23 rHO
C2HF3 Trifluoroethylene 23 rCF
CH3ONO Methyl nitrite 23 rCO
CSe Carbon monoselenide 23 rCSe
C4H10O Methyl propyl ether 21 rCO
C5H8O Cyclopentanone 21 rCC
C3H8O2 Methane, dimethoxy- 20 rCO
Be2 Beryllium diatomic 20 rBeBe
GeH germylidene 20 rHGe
C2H3N3 1H-1,2,4-Triazole 19 rCN
C4H10O Propane, 2-methoxy- 19 rCO
C3O2 Carbon suboxide 19 rCO
C6H6 Fulvene 19 rCH
C4H8O2 1,3-Dioxolane, 2-methyl- 18 rCO
CH3OCHO methyl formate 18 rCO
HOBr Hypobromous acid 18 rOH
Si(CH3)4 tetramethylsilane 18 rSiC
LiOH lithium hydroxide 17 rLiO
NO3 Nitrogen trioxide 17 rNO
CH3OC2H5 Ethane, methoxy- 17 rCO
H2CS Thioformaldehyde 17 rCS
C4H10O Ethoxy ethane 17 rCO
C4H5N Cyclopropanecarbonitrile 17 rCC
C2H3N3 1H-1,2,4-Triazole 16 rCN
CH2C(CH3)OCH3 1-Propene, 2-methoxy- 16 rCO
N3 azide radical 16 rNN
NO Nitric oxide 16 rNO
HCl Hydrogen chloride 15 rHCl
C2H5F fluoroethane 15 rCF
C3H3NO Oxazole 15 rCO
C6H5OCH3 Anisole 14 rCO
CH3OCHO methyl formate 14 rCO
CH3OC2H5 Ethane, methoxy- 14 rCO
CH3OCH3 Dimethyl ether 14 rCO
CH2NN diazomethane 14 rNN
HNCO Isocyanic acid 14 rCO
HO2 Hydroperoxy radical 13 rOH
OCSe Carbonyl selenide 13 rCO
C5H8O Methyl cyclopropyl ketone 13 rCC
C4H10O Methyl propyl ether 13 rCO
C3H3NO Oxazole 12 rCO
C(CH3)3NH2 2-Propanamine, 2-methyl- 12 rCC
C(CH3)3NH2 2-Propanamine, 2-methyl- 11 rCH
C2H5F fluoroethane 11 rCC
C5H8 Ethenylcyclopropane 11 rCC
C5H12O Butane, 1-methoxy- 10 rCO
C6H8 Bicyclo[2.1.1]hex-2-ene 10 rCC
CFCl3 Trichloromonofluoromethane 10 rCF
C3H4 cyclopropene 10 rCH
C3H4 cyclopropene 10 rCH
C4H5N (E)-2-Butenenitrile 10 rCC
C4H5N Cyclopropanecarbonitrile 10 rCC
MgOH magnesium hydroxide 10 rOH
HI Hydrogen iodide 10 rHI
HOCl hypochlorous acid 10 rOH
OCSe Carbonyl selenide 9 rCSe
C4 Carbon tetramer 9 rCC
CH2FCl fluorochloromethane 9 rCF
CH2CO Ketene 8 rCO
CH2CHCHO Acrolein 8 rCC
CH2CHCHO Acrolein 8 rCO
C4H8O2 Ethyl acetate 8 rCO
C4H4N2 1,3-Diazine 8 rCN
CH3COCH2CH3 2-Butanone 8 rCC
CHF2Cl difluorochloromethane 8 rCF
H2O Water 8 rOH
CH3NC methyl isocyanide 7 rCN
HClO4 perchloric acid 7 rOCl
CH3CH2CHO Propanal 6 rCC
HClO4 perchloric acid 6 rOCl
ClCN chlorocyanogen 6 rCN
C3H4N2 1H-Imidazole 6 rCN
C3O2 Carbon suboxide 6 rCC
C3H2N2 Malononitrile 6 rCC
BF3 Borane, trifluoro- 6 rBF
C5H10 2-Pentene, (E)- 6 rCC
C5H8 Cyclopentene 6 rCC
CH2NN diazomethane 6 rCN
C6H5OH phenol 6 rCO
C6H8 1,3-Cyclohexadiene 5 rCC
C6H8 1,3-Cyclohexadiene 5 rCH
C6H8 1,3-Cyclohexadiene 5 rCH
CH3CH(NH2)COOH Alanine 5 rCC
C4H6 Methylenecyclopropane 5 rCC
C4H6O Cyclobutanone 5 rCC
C3H8O2 Methane, dimethoxy- 5 rCO
CH3NC methyl isocyanide 5 rCN
CH3NHCH3 Dimethylamine 5 rCH
NH2CONH2 Urea 5 rNH
LiOH lithium hydroxide 4 rOH
CH3CH2CHO Propanal 4 rCC
CH3CH2CHO Propanal 4 rCH
CH3CH2CHO Propanal 4 rCH
CH3CH2CHO Propanal 4 rCH
CH3CH2CHO Propanal 4 rCH
HBr hydrogen bromide 4 rHBr
C3H4O Cyclopropanone 4 rCC
C3H6 Cyclopropane 4 rCC
C4H5NO 3-Methylisoxazole 4 rCC
C4H6 Bicyclo[1.1.0]butane 4 rCC
C2H3N3 1H-1,2,4-Triazole 4 rCN
C5H10S 2H-Thiopyran, tetrahydro- 4 rCC
C5H8 Ethenylcyclopropane 4 rCC
C5H7N Cyclobutanecarbonitrile 4 rCC
C5H6 Bicyclo[2.1.0]pent-2-ene 4 rCC
CCl2O Phosgene 4 rCO
CH2 Methylene 3 rHC
C5H8 Spiropentane 3 rCC
C6H12 2-Pentene, 3-methyl-, (E)- 3 rCC
C5H10 2-Pentene, (Z)- 3 rCC
C4H6S Thiophene, 2,5-dihydro- 3 rCH
C2H2O2 Ethanedial 3 rCH
C2H Ethynyl radical 3 rCC
C3H8O2 1,3-Propanediol 3 rOH
C3H4N2 1H-Imidazole 3 rCN
CH3CH2NH2 Ethylamine 3 rCH
CH3ONO Methyl nitrite 3 rCH
CH3ONO Methyl nitrite 3 rCH
CH3COCl Acetyl Chloride 3 rCO
CH3NH2 methyl amine 2 rCN
CH3NH2 methyl amine 2 rNH
CH3COCH2CH3 2-Butanone 2 rCC
CH3COCH2CH3 2-Butanone 2 rCH
CH3COCH2CH3 2-Butanone 2 rCH
CH3COCH2CH3 2-Butanone 2 rCH
CH3COCH2CH3 2-Butanone 2 rCH
CH3COCH2CH3 2-Butanone 2 rCH
P2H4 H2PPH2 2 rPH
P2H4 H2PPH2 2 rPH
C2H2 Acetylene 2 rCC
BN boron nitride 2 rBN
AsH3 Arsine 2 rHAs
C5H10 2-Pentene, (Z)- 2 rCH
C5H10O 2-Butanone, 3-methyl- 2 rCC
C5H10O 2-Butanone, 3-methyl- 2 rCH
C6H5OCH3 Anisole 2 rCO
C5H8 Bicyclo[2.1.0]pentane 2 rCC
C5H8 Cyclobutane, methylene- 2 rCC
C5H8 Cyclobutane, methylene- 2 rCH
C6H6 Fulvene 2 rCC
CH2CCHCH3 1,2-Butadiene 2 rCC
CH3CH(NH2)COOH Alanine 2 rCC
CH2CHCH2CH3 1-Butene 1 rCC
CH2CHOCHCH2 Vinyl ether 1 rCO
CH2C(CH3)OCH3 1-Propene, 2-methoxy- 1 rCH
C6H6 Fulvene 1 rCC
C6H8 1,3,5-Hexatriene, (Z)- 1 rCC
C8H8 cyclooctatetraene 1 rCC
C5H8 Bicyclo[2.1.0]pentane 1 rCC
C5H8O 2H-Pyran, 3,4-dihydro- 1 rCC
C6H12 Cyclohexane 1 rCH
C6H5NH2 aniline 1 rCC
C5H5N Pyridine 1 rCC
C5H10O 2-Butanone, 3-methyl- 1 rCC
C5H10 2-Pentene, (Z)- 1 rCH
C5H10 2-Pentene, (Z)- 1 rCC
C10H8 naphthalene 1 rCC
C2H2O2 Ethanedial 1 rCC
C2H3N3 1H-1,2,4-Triazole 1 rCN
C2H4F2 1,2-difluoroethane 1 rCC
C2H5N Aziridine 1 rCH
C2H5N Aziridine 1 rCH
C3H4N2 1H-Imidazole 1 rCN
C3H4N2 1H-Pyrazole 1 rCH
C3H4N2 1H-Pyrazole 1 rCH
C3H4N2 1H-Pyrazole 1 rCH
C3H4N2 1H-Imidazole 1 rCH
C3H4N2 1H-Imidazole 1 rCH
C3H4N2 1H-Imidazole 1 rCH
C3H6O 2-Propen-1-ol 1 rCH
C3H5ClO Oxirane, (chloromethyl)- 1 rCC
C4H6 Bicyclo[1.1.0]butane 1 rCH
C4H6 Cyclobutene 1 rCC
C4H5NO Isoxazole, 5-methyl- 1 rCC
C4H4N2 1,3-Diazine 1 rCN
C4H10O Propane, 2-methoxy- 1 rCH
C4H10O Ethoxy ethane 1 rCC
C4H10O Methyl propyl ether 1 rCC
SiH3Cl chlorosilane 1 rSiH
SiH4 Silane 1 rSiH
SiH2Cl2 dichlorosilane 1 rSiH
CH3COCl Acetyl Chloride 1 rCC
CH3CH2SH ethanethiol 1 rCH
CH3CH2SH ethanethiol 1 rCH
CH3OCHO methyl formate 1 rCH
CH3OCHO methyl formate 1 rCH
H2Se Hydrogen selenide 1 rHSe
CHF2Cl difluorochloromethane 1 rCH