National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 17bSeptember 2015
NIST Standard Reference Database 101
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
XOlder CCCBDB versions
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers

NIST policy on privacy, security, and accessibility.

Please rate our products
© 2013 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.

Please send questions, comments, corrections, additions and suggestions to

return to home page

IV.A.4. (XIV.F.)

Relative enthalpies of isomers - Comparison of 0K enthalpies (kJ mol-1)

Isomers of C14H10

2015 06 30 15:39
index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C14H10 85018 Phenanthrene   sketch of Phenanthrene
b C14H10 120127 Anthracene   sketch of Anthracene
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets

Methods with standard basis sets
3-21G* 6-31G* 6-311G* 6-311G** 6-31G(2df,p) cc-pVTZ
hartree fock HF   0.0 a
27.8 b
density functional BLYP   0.0 a
16.6 b
B3LYP         0.0 a
20.6 b
TPSSh   0.0 a
20.6 b
    0.0 a
20.8 b
0.0 a
20.7 b
wB97X-D 0.0 a
28.3 b
0.0 a
26.9 b
  0.0 a
26.6 b
  0.0 a
26.1 b
3-21G* 6-31G* 6-311G* 6-311G** 6-31G(2df,p) cc-pVTZ
Moller Plesset perturbation MP2   0.0 a
37.2 b
0.0 a
26.7 b
MP3=FULL   0.0 a
27.7 b
3-21G* 6-31G* 6-311G* 6-311G** 6-31G(2df,p) cc-pVTZ
NC = not calculated
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.
gaw refers to the group additivity method implemeted in the NIST Chemistry Webbook.

See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.