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Release 22May 2022
NIST Standard Reference Database 101
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IV.D.8.

Average Bond Length Differences by Model Chemistry

Calculated at CISD/6-311+G(3df,2p)

Species Name Bond type Bond Length (Å)
Experimental unc. Calculated Difference atom1 atom2
SiP Silicon monophosphide rSiP 2.078 ±0.002 1.976 -0.102 1 2
HNO3 Nitric acid rNO 1.406   1.350 -0.056 1 2
PS phosphorus sulfide rP=S 1.900   1.846 -0.054 1 2
C5H6 Propellane rCC 1.596 ±0.005 1.548 -0.048 2 5
C3F6 hexafluoropropene rCF 1.329 ±0.003 1.284 -0.045 1 4
F2 Fluorine diatomic rFF 1.412   1.367 -0.045 1 2
C2H2O2 Ethanedial rCH 1.132   1.094 -0.038 1 3
ClO Monochlorine monoxide rClO 1.596 ±0.001 1.564 -0.032 1 2
CN Cyano radical rC#N 1.172   1.142 -0.030 1 2
SeO2 Selenium dioxide rSeO 1.607 ±0.001 1.577 -0.030 1 2
CH3CH2CH2CH3 Butane rCH 1.117   1.087 -0.030 1 5
HOCl hypochlorous acid rClO 1.697 ±0.001 1.668 -0.029 1 3
LiOH lithium hydroxide rOH 0.969   0.943 -0.026 1 3
SF4 Sulfur tetrafluoride rSF 1.646 ±0.003 1.621 -0.025 1 2
C5H6 Propellane rCC 1.525 ±0.002 1.502 -0.023 1 2
SSO Disulfur monoxide rS=O 1.456   1.434 -0.022 1 2
SSO Disulfur monoxide rS=S 1.884   1.862 -0.022 2 3
C2H6O2S Dimethyl sulfone rCS 1.777 ±0.006 1.755 -0.022 1 4
OCSe Carbonyl selenide rC=O 1.159   1.137 -0.022 1 2
NSe Nitrogen monoselenide rN=Se 1.652   1.630 -0.022 1 2
O2 Oxygen diatomic rO=O 1.208   1.186 -0.022 1 2
NO Nitric oxide rN=O 1.154 ±0.000 1.132 -0.021 1 2
H2Cl+ dihydrogen monochloride cation rHCl 1.321 ±0.000 1.299 -0.021 1 2
SF4 Sulfur tetrafluoride rSF 1.545 ±0.003 1.524 -0.021 1 4
CH3CH2CHO Propanal rCH 1.103   1.082 -0.021 1 6
HF+ hydrogen fluoride cation rHF 1.014   0.994 -0.021 1 2
C3F6 hexafluoropropene rC=C 1.329 ±0.003 1.309 -0.020 1 2
SeO Selenium monoxide rSeO 1.639 ±0.001 1.620 -0.020 1 2
N3 azide radical rNN 1.181   1.161 -0.020 1 2
CO+ carbon monoxide cation rC=O 1.115 ±0.000 1.095 -0.020 1 2
HOCl hypochlorous acid rOH 0.973 ±0.002 0.955 -0.018 1 2
SO+ sulfur monoxide cation rO=S 1.424   1.406 -0.018 1 2
OPCl Phosphorus oxychloride rP=O 1.462 ±0.011 1.444 -0.018 1 2
PN Phosphorus mononitride rP#N 1.491   1.473 -0.018 1 2
SeCl2 Selenium Dichloride rClSe 2.157 ±0.003 2.140 -0.017 1 2
CH3CH2CHO Propanal rCH 1.105   1.088 -0.017 2 8
ArH+ Argon hydride cation rArH 1.292 ±0.000 1.276 -0.017 1 2
B2H6 Diborane rBH 1.200   1.184 -0.016 1 5
CH2NH Methanimine rCH 1.103   1.087 -0.016 1 3
CH3CH2CHO Propanal rCH 1.115   1.099 -0.016 3 10
CBr4 Carbon tetrabromide rCBr 1.942 ±0.002 1.926 -0.016 1 2
CH3NH2 methyl amine rCN 1.471 ±0.003 1.456 -0.015 1 2
NO+ nitric oxide cation rN=O 1.066   1.051 -0.015 1 2
CF Fluoromethylidyne rCF 1.276   1.261 -0.015 1 2
SO Sulfur monoxide rS=O 1.481   1.467 -0.015 1 2
ClF Chlorine monofluoride rFCl 1.628 ±0.000 1.614 -0.014 1 2
CH3CHO Acetaldehyde rCH 1.114   1.100 -0.014 1 4
SCSe Carbon sulfide selenide rC=S 1.553 ±0.002 1.539 -0.014 1 2
CH2CO Ketene rC=O 1.162   1.148 -0.014 2 3
HS+ sulfur monohydride cation rSH 1.374   1.361 -0.014 1 2
HeH+ Helium hydride cation rHHe 0.790   0.776 -0.014 1 2
CH3CH2CHO Propanal rCH 1.096   1.083 -0.013 1 5
PO Phosphorus monoxide rP=O 1.476   1.463 -0.013 1 2
HSiCl Chlorosilylene rSiH 1.525 ±0.005 1.512 -0.013 1 3
CH3NH2 methyl amine rNH 1.018 ±0.001 1.005 -0.013 2 6
CHF3 Methane, trifluoro- rCF 1.328 ±0.003 1.316 -0.013 1 3
H2CSe Selenoformaldehyde rC=Se 1.753   1.741 -0.013 1 2
Cl2+ chlorine diatomic cation rClCl 1.892   1.879 -0.012 1 2
CaO Calcium monoxide rOCa 1.822   1.810 -0.012 1 2
As4 Arsenic tetramer rAsAs 2.435   2.423 -0.012 1 2
H2CS Thioformaldehyde rC=S 1.611   1.599 -0.012 1 2
C2H6O2S Dimethyl sulfone rS=O 1.431 ±0.004 1.419 -0.012 1 2
CH3CCH propyne rCH 1.096   1.084 -0.012 1 5
CHF3 Methane, trifluoro- rCH 1.091 ±0.014 1.079 -0.012 1 2
NH2SH Thiohydroxylamine rSH 1.344 ±0.029 1.332 -0.012 2 3
CH2CHCH2CH3 1-Butene rCC 1.536   1.525 -0.011 1 2
CH2CO Ketene rCH 1.083   1.071 -0.011 1 4
CH2F2 Methane, difluoro- rCF 1.351 ±0.001 1.340 -0.011 1 4
HNCNH diiminomethane rC=N 1.224 ±0.001 1.213 -0.011 1 2
C2H2+ acetylene cation rC=C 1.253 ±0.001 1.242 -0.011 1 2
CH3CHFCH3 2-Fluoropropane rCH 1.093 ±0.006 1.082 -0.011 4 8
C2H2O2 Ethanedial rCC 1.526   1.515 -0.011 1 2
BF Boron monofluoride rBF 1.267 ±0.000 1.256 -0.011 1 2
CH3CHFCH3 2-Fluoropropane rCH 1.094 ±0.005 1.083 -0.011 4 10
CH3CHS Thioacetaldehyde rCH 1.098   1.087 -0.011 2 6
CH3CSNH2 Ethanethioamide rC=S 1.647 ±0.002 1.637 -0.010 1 2
H2CSe Selenoformaldehyde rHC 1.090   1.080 -0.010 1 3
CH3CH2CH2CH3 Butane rCC 1.531   1.521 -0.010 1 2
BrF Bromine monofluoride rFBr 1.759 ±0.000 1.749 -0.010 1 2
C2H2ClF 1-chloro-1-fluoroethylene rCH 1.082 ±0.001 1.072 -0.010 2 5
BO boron monoxide rB=O 1.205   1.195 -0.010 1 2
B2H6 Diborane rBH 1.320   1.311 -0.009 1 3
CH3CH2CHO Propanal rCC 1.509   1.500 -0.009 2 3
SiO Silicon monoxide rSiO 1.510 ±0.000 1.500 -0.009 1 2
BF3 Borane, trifluoro- rBF 1.307   1.298 -0.009 1 2
N2 Nitrogen diatomic rN#N 1.098   1.089 -0.009 1 2
CSe Carbon monoselenide rC=Se 1.676 ±0.000 1.667 -0.009 1 2
CH3CHS Thioacetaldehyde rCH 1.090   1.081 -0.009 2 5
CH2Cl2 Methylene chloride rCH 1.085 ±0.002 1.076 -0.009 1 2
CH2Cl2 Methylene chloride rCCl 1.767 ±0.002 1.758 -0.009 1 4
C3H8 Propane rCH 1.096   1.087 -0.009 1 4
CO Carbon monoxide rC#O 1.128 ±0.000 1.120 -0.008 1 2
OPCl Phosphorus oxychloride rPCl 2.059 ±0.004 2.050 -0.008 1 3
CH3CH2CHO Propanal rCC 1.523   1.515 -0.008 1 2
NO- nitric oxide anion rN=O 1.258 ±0.010 1.250 -0.008 1 2
C3H6 Cyclopropane rCH 1.083   1.075 -0.008 1 4
S2 Sulfur diatomic rS=S 1.889   1.882 -0.007 1 2
HSe Selenium monohydride rSeH 1.475 ±0.010 1.468 -0.007 1 2
SiH3F monofluorosilane rSiH 1.476   1.469 -0.007 1 3
CH2CHF Ethene, fluoro- rCH 1.082   1.075 -0.007 1 4
C2H2 Acetylene rC#C 1.203   1.196 -0.007 1 2
CH2Br2 dibromomethane rCBr 1.925 ±0.002 1.918 -0.007 1 4
SF Monosulfur monofluoride rSF 1.599   1.593 -0.007 1 2
CH3CHFCH3 2-Fluoropropane rCH 1.092   1.086 -0.006 1 3
SiH3Cl chlorosilane rSiH 1.475   1.469 -0.006 1 3
Si2 Silicon diatomic rSiSi 2.246   2.240 -0.006 1 2
C3H4 cyclopropene rCH 1.088   1.082 -0.006 1 6
PF2 Phosphorus difluoride rPF 1.579   1.574 -0.006 1 2
HF Hydrogen fluoride rHF 0.917 ±0.000 0.912 -0.005 1 2
Se2 Selenium diatomic rSe=Se 2.166 ±0.001 2.161 -0.005 1 2
CH3CHO Acetaldehyde rCH 1.086   1.081 -0.005 2 5
CH3CHS Thioacetaldehyde rCH 1.089   1.084 -0.005 1 4
H2O Water rOH 0.958 ±0.000 0.953 -0.005 1 2
SiS silicon monosulfide rSiS 1.929 ±0.000 1.925 -0.005 1 2
C3O2 Carbon suboxide rC=O 1.146   1.141 -0.005 2 4
CH3CHFCH3 2-Fluoropropane rCH 1.088 ±0.006 1.083 -0.005 4 6
HCl+ hydrogen chloride cation rHCl 1.315   1.310 -0.004 1 2
OH Hydroxyl radical rOH 0.970   0.966 -0.004 1 2
C3H6 Cyclopropane rCC 1.501   1.497 -0.004 1 2
SCSe Carbon sulfide selenide rC=Se 1.695 ±0.002 1.691 -0.004 1 3
AsH Arsenic monohydride rAsH 1.535 ±0.001 1.531 -0.004 1 2
Cl2 Chlorine diatomic rClCl 1.988   1.984 -0.004 1 2
HCl Hydrogen chloride rHCl 1.275 ±0.000 1.271 -0.003 1 2
C2H2 Acetylene rCH 1.063   1.060 -0.003 1 3
C3H4 cyclopropene rCH 1.072   1.069 -0.003 2 4
SiH2F2 difluorosilane rSiH 1.462   1.458 -0.003 1 4
BrCl Bromine monochloride rClBr 2.136 ±0.000 2.133 -0.003 1 2
CH2CHF Ethene, fluoro- rCH 1.077   1.074 -0.003 2 5
HS- mercapto anion rSH 1.343   1.340 -0.003 1 2
CH3Br methyl bromide rCH 1.082 ±0.001 1.080 -0.003 1 3
CH3Br methyl bromide rCBr 1.934 ±0.000 1.932 -0.002 1 2
CH3CCH propyne rCH 1.060   1.058 -0.002 3 4
CH2F2 Methane, difluoro- rCH 1.084 ±0.003 1.082 -0.002 1 2
CH3NH2 methyl amine rCH 1.093 ±0.000 1.091 -0.002 1 3
CH Methylidyne rCH 1.120   1.118 -0.002 1 2
CH4 Methane rCH 1.087 ±0.001 1.086 -0.001 1 2
KrH+ Protonated Krypton rHKr 1.421 ±0.000 1.420 -0.001 1 2
C2H2+ acetylene cation rCH 1.077 ±0.005 1.076 -0.001 1 3
PH phosphorus monohydride rPH 1.422   1.421 -0.001 1 2
C2H3 vinyl rCH 1.085   1.085 0.000 2 4
AlNC Aluminum isocyanide rAlN 1.855 ±0.005 1.855 0.000 1 2
H2 Hydrogen diatomic rHH 0.741   0.742 0.001 1 2
GeO Germanium monoxide rOGe 1.625   1.626 0.001 1 2
Br2 Bromine diatomic rBrBr 2.281   2.282 0.001 1 2
HBr+ hydrogen bromide cation rHBr 1.448   1.450 0.001 1 2
BrO Bromine monoxide rOBr 1.718   1.719 0.002 1 2
HBr hydrogen bromide rHBr 1.414 ±0.000 1.417 0.002 1 2
SiH3+ Silyl cation rSiH 1.460 ±0.010 1.462 0.002 1 2
CH2CHCH2CH3 1-Butene rCC 1.493   1.495 0.002 2 3
H2Se Hydrogen selenide rSeH 1.460   1.463 0.003 1 2
SiH Silylidyne rSiH 1.520   1.523 0.003 1 2
NCl nitrogen monochloride rNCl 1.611 ±0.000 1.614 0.003 1 2
SiH3F monofluorosilane rSiF 1.595   1.598 0.003 1 2
SiH3Cl chlorosilane rSiCl 2.051   2.054 0.004 1 2
He2+ helium diatomic cation rHeHe 1.081 ±0.001 1.085 0.004 1 2
GeBr4 Germanium tetrabromide rGeBr 2.272 ±0.001 2.276 0.004 1 2
SiF2 Silicon difluoride rFSi 1.590 ±0.000 1.595 0.005 1 2
OCSe Carbonyl selenide rC=Se 1.709   1.714 0.005 1 3
SiCl Clorosilylidyne rSiCl 2.061 ±0.000 2.068 0.007 1 2
LiNH2 lithium amide rLiN 1.736 ±0.003 1.744 0.008 1 2
AsH3 Arsine rAsH 1.511 ±0.000 1.518 0.008 1 2
CFCl chlorofluoromethylene rCCl 1.714   1.722 0.008 1 3
SiBr+ Silicon monobromide cation rSiBr 2.095 ±0.000 2.105 0.009 1 2
LiOH lithium hydroxide rLiO 1.582   1.591 0.009 1 2
HSiCl Chlorosilylene rSiCl 2.067 ±0.003 2.077 0.010 1 2
KH Potassium hydride rKH 2.243 ±0.001 2.253 0.010 1 2
C3H5 Allyl radical rCH 1.069   1.080 0.011 1 2
AlF Aluminum monofluoride rAlF 1.654 ±0.000 1.667 0.013 1 2
MgH magnesium monohydride rMgH 1.730   1.743 0.014 1 2
GeH germylidene rGeH 1.588   1.602 0.014 1 2
C3O2 Carbon suboxide rC=C 1.251   1.266 0.015 1 2
LiH Lithium Hydride rLiH 1.595 ±0.000 1.610 0.015 1 2
GeH3F monofluorogermane rGeH 1.515 ±0.000 1.530 0.015 1 3
LiF lithium fluoride rLiF 1.564 ±0.000 1.580 0.016 1 2
LiCl lithium chloride rLiCl 2.021 ±0.000 2.037 0.016 1 2
GeCl Germanium monochloride rClGe 2.164 ±0.000 2.180 0.016 1 2
CaC Calcium monocarbide rC#Ca 2.302   2.321 0.019 1 2
AlBr Aluminum monobromide rAlBr 2.295   2.316 0.021 1 2
LiBr Lithium Bromide rLiBr 2.170 ±0.000 2.195 0.025 1 2
GaF Gallium monofluoride rFGa 1.774 ±0.000 1.805 0.031 1 2
GaBr Gallium monobromide rGaBr 2.352 ±0.000 2.394 0.041 1 2
GeH3F monofluorogermane rGeF 1.731 ±0.000 1.778 0.047 1 2
GaAs Gallium arsenide rGa#As 2.530 ±0.020 2.579 0.049 1 2
CaBr Calcium monobromide rCaBr 2.594 ±0.000 2.644 0.050 1 2
GeF Germanium monofluoride rFGe 1.745   1.800 0.055 1 2
NaLi lithium sodium rLiNa 2.889   2.955 0.066 1 2
186 molecules.