Basis set and method dependence of the relative energies of C2S2H2 isomers

Vijay, Dolly ; Priyakumar, U. Deva ; Sastry, G. Narahari (2004) Basis set and method dependence of the relative energies of C2S2H2 isomers Chemical Physics Letters, 383 (1-2). pp. 192-197. ISSN 0009-2614

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.cplett.2003.11.021

Abstract

Hartree–Fock, post-Hartree–Fock (MP2 and CCSD(T)) and density functional theory (BLYP, B3LYP, BPW91 and B3PW91) methods were employed to obtain the relative stabilities of eight energetically competitive C2S2H2 isomers. Peculiarly high dependency on the basis set has been observed and the convergence of the relative stability orderings is slow even at the quintuple-ζ levels. Basis sets starting from 6-31G*, 6-311G*, 6-311+G*, 6-311+G**, 6-311++G**, 6-31G(2df), 6-31G(3df), 6-31G(3df,3pd), cc-pVDZ, cc-pVTZ, cc-pVQZ and cc-pV5Z were used in conjunction with various methodologies. A critical comparison of the performance of the density functional methods with MP2, CCSD(T) and G2 methods was made.

Item Type:Article
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ID Code:106637
Deposited On:28 Jul 2017 09:25
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