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 M06-2X/6-31G*

		Point group
Species	Name	Experimental	Calculated
HD	Deuterium hydride	C∞v	D∞h
HDO	Water-d1	Cs	C2v
C2H	Ethynyl radical	C∞v	Cs
MgOH	magnesium hydroxide	C∞v	Cs
CH3S	thiomethoxy	C3v	C1
BO2	Boron dioxide	D∞h	C∞v
HCCO	ketenyl radical	C∞v	Cs
CH3CO+	acetyl cation	C3v	Cs
CH3OHH2O	methanol water dimer	Cs	C1
CaF2	Calcium difluoride	C2v	D∞h
C4H6	1-Methylcyclopropene	C1	Cs
NO3	Nitrogen trioxide	D3h	C2v
HCONHCH3	N-methylformamide	Cs	C1
CH3COCH3	Acetone	C2v	C2
C3H5Cl	1-Propene, 3-chloro-	Cs	C1
CH2ClCH2OH2+	2-chloroethanol, protonated	C1	Cs
C5H5	cyclopentadienyl radical	D5h	C2v
C5H8	1,2-Pentadiene	C1	Cs
C(NH2)H2CH2CH2CH3	1-Butanamine	C1	Cs
C(CH3)3NH2	2-Propanamine, 2-methyl-	C1	Cs
HOCH2COOH	Hydroxyacetic acid	Cs	C1
C4H6O	Cyclobutanone	C2v	Cs
C2H6N2O	Urea, methyl-	Cs	C1
C4H8S	Thiophene, tetrahydro-	C1	C2
CHCl2CHO	dichloroacetaldehyde	C1	Cs
C6H10	Cyclopentene, 4-methyl-	C1	Cs
C6H10	3-Hexyne	C2v	C2
C6H12	3-methylenepentane	C1	C2
C6H12	Cyclopentane, methyl-	C1	Cs
C6H14	Butane, 2,2-dimethyl-	C1	Cs
C5H7N	Cyclobutanecarbonitrile	Cs	C1
C2O4--	oxalate anion	D2d	D2h
C2H5NO3	Nitric acid, ethyl ester	C1	Cs
HCONH2CN2H4	formamide aminomethanimine dimer	Cs	C1
C5H5NO	3(6H)-Pyridinone	Cs	C1
C5H5NO	4(1H)-Pryidinone	C2v	Cs
C6H5CHCH2	Styrene	Cs	C1
CH3C6H4CH3	meta-xylene	Cs	C1
C8H14	Bicyclo[2.2.2]octane	D3h	D3
CH3COC6H5	acetophenone	C1	Cs