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.3.a. (XVIII.A.3.)

Species with point groups that differ from experiment at MP2/CEP-31G

		Point group
Species	Name	Experimental	Calculated
HD	Deuterium hydride	C∞v	D∞h
C2H4+	Ethylene cation	D2h	D2
HCN+	hydrogen cyanide cation	C∞v	Cs
BeOH	beryllium monohydroxide	Cs	C∞v
BeOH	beryllium monohydroxide	Cs	C∞v
CH2NN	diazomethane	C2v	Cs
NHCHNH2	aminomethanimine	C1	Cs
BO2	Boron dioxide	D∞h	C∞v
BO2	Boron dioxide	D∞h	C∞v
HCNO	fulminic acid	C∞v	Cs
Li2S	dilithium sulfide	C2v	D∞h
CaF2	Calcium difluoride	C2v	D∞h
Zn(CH3)2	dimethyl zinc	C2v	D3d
H2CCCCH2	Butatriene	D2h	C2h
C4H6	1-Methylcyclopropene	C1	Cs
ONNO	NO dimer	C2h	C2v
CH3COO-	acetate anion	Cs	C1
HCONHCH3	N-methylformamide	Cs	C1
CH3COCH3	Acetone	C2v	C2
C2F2	difluoroacetylene	D∞h	C2h
CF3+	Trifluoromethyl cation	D3h	C3v
SO3-	Sulfur trioxide anion	D3h	C3v
S4	Sulfur tetramer	C2v	C2h
NH2CSNH2	Thiourea	C2	C2v
C2Cl2	dichloroacetylene	D∞h	C2h
C3H5Cl	1-Propene, 3-chloro-	Cs	C1
CH2ClCH2OH2+	2-chloroethanol, protonated	C1	Cs
C5H6	1,3-Cyclopentadiene	C2v	Cs
C5H10	Cyclopropane, 1,1-dimethyl-	C2v	C1
C(NH2)H2CH2CH2CH3	1-Butanamine	C1	Cs
C4H6O	Cyclobutanone	C2v	Cs
C2H6N2O	Urea, methyl-	Cs	C1
CHCl2CHO	dichloroacetaldehyde	C1	Cs
C6H8	Bicyclo[2.2.0]hex-1(4)-ene	D2h	C2h
C6H10	3-Hexyne	C2v	C2
C6H14	Butane, 2,2-dimethyl-	C1	Cs
C4N2	2-Butynedinitrile	D∞h	C2h
C2H5NO3	Nitric acid, ethyl ester	C1	Cs
C6H5CHCH2	Styrene	Cs	C1
C8H14	Bicyclo[2.2.2]octane	D3h	D3
C6H12O2	Hexanoic acid	Cs	C1
CH3COC6H5	acetophenone	C1	Cs
Fe(CO)5	Iron pentacarbonyl	C4v	C1