National Institute of Standards and Technology

Computational Chemistry Comparison and Benchmark DataBase
Release 22	May 2022
NIST Standard Reference Database 101

I	Introduction
II	Experimental data
III	Calculated data
IV	Data comparisons
V	Cost comparisons
VI	Input and output files
VII	Tutorials and Units
VIII	Links to other sites
IX	Feedback
X	Older CCCBDB versions
XII	Geometries
XIII	Vibrations
XIV	Reaction data
XV	Entropy data
XVI	Bibliographic data
XVII	Ion data
XVIII	Bad calculations
XIX	Index of properties
XX	H-bond dimers
XXI	Oddities

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IV.D.8.

Average Bond Length Differences by Model Chemistry

Calculated at BLYP/daug-cc-pVTZ

Species	Name	Bond type	Bond Length (Å)
			Experimental	unc.	Calculated	Difference	atom1	atom2
SiP	Silicon monophosphide	rSiP	2.078	±0.002	2.008	-0.069	1	2
C2H2O2	Ethanedial	rCH	1.132		1.114	-0.018	1	3
NO-	nitric oxide anion	rN=O	1.258	±0.010	1.240	-0.018	1	2
C4H8O2	Ethyl acetate	rCH	1.105		1.092	-0.013	1	7
B2H6	Diborane	rBH	1.200		1.190	-0.010	1	5
CH3CH2CHO	Propanal	rCH	1.103		1.095	-0.008	1	6
C8H8	cubane	rCH	1.097		1.093	-0.004	1	9
CH2NH	Methanimine	rCH	1.103		1.101	-0.002	1	3
B2H6	Diborane	rBH	1.320		1.318	-0.002	1	3
CH3CH2OH	Ethanol	rCH	1.098		1.096	-0.002	1	6
CH3CH2CHO	Propanal	rCH	1.105		1.104	-0.001	2	8
CH3CH2CHO	Propanal	rCH	1.096		1.096	0.000	1	5
NaLi	lithium sodium	rLiNa	2.889		2.889	0.000	1	2
H2CSe	Selenoformaldehyde	rHC	1.090		1.091	0.000	1	3
C2H2+	acetylene cation	rC=C	1.253	±0.001	1.253	0.001	1	2
LiH	Lithium Hydride	rLiH	1.595	±0.000	1.596	0.002	1	2
CH3CCH	propyne	rCH	1.096		1.098	0.002	1	5
CH2CO	Ketene	rCH	1.083		1.085	0.002	1	4
CH3NH2	methyl amine	rNH	1.018	±0.001	1.020	0.002	2	6
LiNH2	lithium amide	rLiN	1.736	±0.003	1.739	0.003	1	2
CH2Cl2	Methylene chloride	rCH	1.085	±0.002	1.088	0.003	1	2
CH3CHClCH3	Propane, 2-chloro-	rCH	1.091		1.094	0.003	2	5
CN	Cyano radical	rC#N	1.172		1.175	0.003	1	2
C2H2	Acetylene	rC#C	1.203		1.206	0.003	1	2
CH3CHS	Thioacetaldehyde	rCH	1.090		1.093	0.003	2	5
CH3CHS	Thioacetaldehyde	rCH	1.098		1.101	0.003	2	6
C3H8	Propane	rCH	1.096		1.100	0.004	1	4
C2H2	Acetylene	rCH	1.063		1.067	0.004	1	3
C3H6	Cyclopropane	rCH	1.083		1.087	0.004	1	4
CHF3	Methane, trifluoro-	rCH	1.091	±0.014	1.095	0.004	1	2
CH3CHO	Acetaldehyde	rCH	1.114		1.118	0.004	1	4
CH3CH2CHO	Propanal	rCH	1.115		1.120	0.005	3	10
CH3OCH3	Dimethyl ether	rCH	1.099	±0.001	1.104	0.005	2	6
H2	Hydrogen diatomic	rHH	0.741		0.746	0.005	1	2
N2	Nitrogen diatomic	rN#N	1.098		1.103	0.005	1	2
HOCl	hypochlorous acid	rOH	0.973	±0.002	0.979	0.005	1	2
CH2CHF	Ethene, fluoro-	rCH	1.082		1.087	0.005	1	4
HNCNH	diiminomethane	rC=N	1.224	±0.001	1.230	0.006	1	2
C3H4	cyclopropene	rCH	1.088		1.094	0.006	1	6
CH3CCH	propyne	rCH	1.060		1.066	0.006	3	4
C4H8O2	Ethyl acetate	rCC	1.515		1.522	0.007	5	6
CH3Br	methyl bromide	rCH	1.082	±0.001	1.089	0.007	1	3
CH3CH2CHO	Propanal	rCC	1.509		1.516	0.007	2	3
CH3CHClCH3	Propane, 2-chloro-	rCH	1.092		1.099	0.007	3	6
CH4	Methane	rCH	1.087	±0.001	1.094	0.007	1	2
C2H2+	acetylene cation	rCH	1.077	±0.005	1.084	0.007	1	3
CH3NH2	methyl amine	rCN	1.471	±0.003	1.479	0.008	1	2
CH3CHO	Acetaldehyde	rCH	1.086		1.094	0.008	2	5
NO	Nitric oxide	rN=O	1.154	±0.000	1.162	0.008	1	2
CH3CHS	Thioacetaldehyde	rCH	1.089		1.097	0.008	1	4
C3H4	cyclopropene	rCH	1.072		1.081	0.009	2	4
CO+	carbon monoxide cation	rC=O	1.115	±0.000	1.124	0.009	1	2
CH2CHF	Ethene, fluoro-	rCH	1.077		1.086	0.009	2	5
CH3CH2OH	Ethanol	rCH	1.088		1.097	0.009	1	5
CH3OCH3	Dimethyl ether	rCH	1.085	±0.001	1.094	0.009	2	4
CO	Carbon monoxide	rC#O	1.128	±0.000	1.138	0.009	1	2
C4H8O2	Ethyl acetate	rCC	1.508		1.517	0.009	1	2
OCSe	Carbonyl selenide	rC=O	1.159		1.168	0.010	1	2
CH3CH2CHO	Propanal	rCC	1.523		1.533	0.010	1	2
SiH4	Silane	rSiH	1.480	±0.000	1.490	0.010	1	2
C2H2O2	Ethanedial	rCC	1.526		1.536	0.010	1	2
BF	Boron monofluoride	rBF	1.267	±0.000	1.278	0.011	1	2
SiH3F	monofluorosilane	rSiH	1.476		1.487	0.011	1	3
SiH3Cl	chlorosilane	rSiH	1.475		1.486	0.011	1	3
CH2CO	Ketene	rC=O	1.162		1.173	0.011	2	3
CH3NH2	methyl amine	rCH	1.093	±0.000	1.104	0.012	1	3
CH	Methylidyne	rCH	1.120		1.132	0.012	1	2
OH-	hydroxide anion	rOH	0.964		0.976	0.012	1	2
HSe	Selenium monohydride	rSeH	1.475	±0.010	1.487	0.012	1	2
CH2F2	Methane, difluoro-	rCH	1.084	±0.003	1.096	0.012	1	2
LiCl	lithium chloride	rLiCl	2.021	±0.000	2.033	0.013	1	2
ArH+	Argon hydride cation	rArH	1.292	±0.000	1.305	0.013	1	2
H2O	Water	rOH	0.958	±0.000	0.972	0.014	1	2
AsH	Arsenic monohydride	rAsH	1.535	±0.001	1.549	0.014	1	2
HF+	hydrogen fluoride cation	rHF	1.014		1.029	0.015	1	2
C4H8O2	Ethyl acetate	rC=O	1.203		1.218	0.015	2	4
H2CS	Thioformaldehyde	rC=S	1.611		1.626	0.015	1	2
PN	Phosphorus mononitride	rP#N	1.491		1.506	0.015	1	2
SCSe	Carbon sulfide selenide	rC=S	1.553	±0.002	1.569	0.016	1	2
C3H6	Cyclopropane	rCC	1.501		1.517	0.016	1	2
NH2SH	Thiohydroxylamine	rSH	1.344	±0.029	1.360	0.016	2	3
CH3CH2OH	Ethanol	rCH	1.086		1.102	0.016	2	8
OH	Hydroxyl radical	rOH	0.970		0.986	0.017	1	2
LiBr	Lithium Bromide	rLiBr	2.170	±0.000	2.188	0.018	1	2
HSiCl	Chlorosilylene	rSiH	1.525	±0.005	1.543	0.018	1	3
HF	Hydrogen fluoride	rHF	0.917	±0.000	0.935	0.018	1	2
CF	Fluoromethylidyne	rCF	1.276		1.294	0.018	1	2
HCl	Hydrogen chloride	rHCl	1.275	±0.000	1.293	0.018	1	2
SiH2F2	difluorosilane	rSiH	1.462		1.480	0.019	1	4
H2CSe	Selenoformaldehyde	rC=Se	1.753		1.772	0.019	1	2
CH3OCH3	Dimethyl ether	rCO	1.411	±0.001	1.430	0.019	1	2
PH	phosphorus monohydride	rPH	1.422		1.442	0.019	1	2
ClO	Monochlorine monoxide	rClO	1.596	±0.001	1.615	0.019	1	2
OCSe	Carbonyl selenide	rC=Se	1.709		1.729	0.020	1	3
LiF	lithium fluoride	rLiF	1.564	±0.000	1.584	0.020	1	2
F2	Fluorine diatomic	rFF	1.412		1.433	0.021	1	2
HBr	hydrogen bromide	rHBr	1.414	±0.000	1.436	0.021	1	2
SCSe	Carbon sulfide selenide	rC=Se	1.695	±0.002	1.717	0.022	1	3
CSe	Carbon monoselenide	rC=Se	1.676	±0.000	1.699	0.022	1	2
CH3CSNH2	Ethanethioamide	rC=S	1.647	±0.002	1.670	0.023	1	2
H2Se	Hydrogen selenide	rSeH	1.460		1.483	0.023	1	2
HCl+	hydrogen chloride cation	rHCl	1.315		1.338	0.023	1	2
O2	Oxygen diatomic	rO=O	1.208		1.231	0.024	1	2
HBr+	hydrogen bromide cation	rHBr	1.448		1.472	0.024	1	2
SiH	Silylidyne	rSiH	1.520		1.544	0.024	1	2
C4H8O2	Ethyl acetate	rCO	1.345		1.370	0.025	2	3
MgH	magnesium monohydride	rMgH	1.730		1.756	0.027	1	2
AsH3	Arsine	rAsH	1.511	±0.000	1.538	0.027	1	2
C3O2	Carbon suboxide	rC=C	1.251		1.279	0.028	1	2
GeH3F	monofluorogermane	rGeH	1.515	±0.000	1.542	0.028	1	3
SiO	Silicon monoxide	rSiO	1.510	±0.000	1.538	0.029	1	2
C3O2	Carbon suboxide	rC=O	1.146		1.175	0.029	2	4
GeO	Germanium monoxide	rOGe	1.625		1.655	0.030	1	2
GeH	germylidene	rGeH	1.588		1.619	0.031	1	2
SO+	sulfur monoxide cation	rO=S	1.424		1.455	0.031	1	2
CHF3	Methane, trifluoro-	rCF	1.328	±0.003	1.360	0.032	1	3
CH2F2	Methane, difluoro-	rCF	1.351	±0.001	1.383	0.032	1	4
PS	phosphorus sulfide	rP=S	1.900		1.935	0.035	1	2
AlNC	Aluminum isocyanide	rAlN	1.855	±0.005	1.890	0.035	1	2
BrO	Bromine monoxide	rOBr	1.718		1.754	0.036	1	2
SeO2	Selenium dioxide	rSeO	1.607	±0.001	1.644	0.037	1	2
SiS	silicon monosulfide	rSiS	1.929	±0.000	1.966	0.037	1	2
SeO	Selenium monoxide	rSeO	1.639	±0.001	1.677	0.038	1	2
CH2Cl2	Methylene chloride	rCCl	1.767	±0.002	1.808	0.041	1	4
SiH3F	monofluorosilane	rSiF	1.595		1.636	0.041	1	2
PF5	Phosphorus pentafluoride	rFP	1.577		1.618	0.041	1	5
SO	Sulfur monoxide	rS=O	1.481		1.525	0.043	1	2
SSO	Disulfur monoxide	rS=O	1.456		1.501	0.044	1	2
SiH3Cl	chlorosilane	rSiCl	2.051		2.097	0.046	1	2
CH2Br2	dibromomethane	rCBr	1.925	±0.002	1.971	0.046	1	4
GeH3F	monofluorogermane	rGeF	1.731	±0.000	1.779	0.048	1	2
PF5	Phosphorus pentafluoride	rPF	1.534		1.582	0.048	1	2
HOCl	hypochlorous acid	rClO	1.697	±0.001	1.745	0.048	1	3
AlF	Aluminum monofluoride	rAlF	1.654	±0.000	1.702	0.048	1	2
SF	Monosulfur monofluoride	rSF	1.599		1.648	0.048	1	2
BrF	Bromine monofluoride	rFBr	1.759	±0.000	1.808	0.049	1	2
SiF2	Silicon difluoride	rFSi	1.590	±0.000	1.640	0.050	1	2
PF2	Phosphorus difluoride	rPF	1.579		1.630	0.051	1	2
S2	Sulfur diatomic	rS=S	1.889		1.940	0.051	1	2
GaF	Gallium monofluoride	rFGa	1.774	±0.000	1.825	0.051	1	2
GeF	Germanium monofluoride	rFGe	1.745		1.796	0.051	1	2
CH3Br	methyl bromide	rCBr	1.934	±0.000	1.986	0.052	1	2
SiCl	Clorosilylidyne	rSiCl	2.061	±0.000	2.116	0.054	1	2
As4	Arsenic tetramer	rAsAs	2.435		2.490	0.055	1	2
Se2	Selenium diatomic	rSe=Se	2.166	±0.001	2.221	0.055	1	2
SeCl2	Selenium Dichloride	rClSe	2.157	±0.003	2.213	0.056	1	2
SiBr+	Silicon monobromide cation	rSiBr	2.095	±0.000	2.152	0.057	1	2
SSO	Disulfur monoxide	rS=S	1.884		1.941	0.057	2	3
HSiCl	Chlorosilylene	rSiCl	2.067	±0.003	2.128	0.061	1	2
GeCl	Germanium monochloride	rClGe	2.164	±0.000	2.226	0.062	1	2
SF4	Sulfur tetrafluoride	rSF	1.545	±0.003	1.610	0.065	1	4
BrCl	Bromine monochloride	rClBr	2.136	±0.000	2.201	0.065	1	2
Cl2+	chlorine diatomic cation	rClCl	1.892		1.958	0.066	1	2
Cl2	Chlorine diatomic	rClCl	1.988		2.056	0.068	1	2
Br2	Bromine diatomic	rBrBr	2.281		2.349	0.068	1	2
AlBr	Aluminum monobromide	rAlBr	2.295		2.363	0.069	1	2
SF4	Sulfur tetrafluoride	rSF	1.646	±0.003	1.718	0.072	1	2
GaBr	Gallium monobromide	rGaBr	2.352	±0.000	2.426	0.073	1	2
C4H8O2	Ethyl acetate	rCO	1.448		1.522	0.074	5	6
HNO3	Nitric acid	rNO	1.406		1.480	0.074	1	2
GaAs	Gallium arsenide	rGa#As	2.530	±0.020	2.619	0.089	1	2

161 molecules.