Glycine Conformational Analysis

Ching-Han Hu, Mingzuo Shen, Henry F. Schaefer

Research output: Contribution to journalArticle

240 Citations (Scopus)

Abstract

Ab initio quantum mechanical methods, including the self-consistent field (SCF), single and double excitation configuration interaction (CISD), the single and double excitation coupled cluster (CCSD), and the single, double, and perturbative triple excitation coupled cluster [CCSD(T)] have been applied to five C5 conformers and four of their C1 counterparts on the potential energy hypersurface of glycine. A large basis set TZ2P+f designated H(5s2p1d/ 3s2p1d) and C,N,O(10s6p2d1f/5s3p2d1f) was chosen to evaluate the importance of d functions on hydrogen and f functions on carbon, nitrogen, and oxygen. A very subtle feature of the glycine potential energy hypersurface is the out-of-plane bending of the C5 structures II (to C\ structure III) and IV (to C1 structure V). Conformer I is the global minimum at all levels of theory. Two of our results are different from previous ab initio predictions: structure II/III is lower in energy than structure IV/V at our highest level of theory, and should be identified as the second minimum. Secondly, although the C1 structure V lies slightly below its C5 counterpart IV at the DZP SCF and TZ2P SCF levels of theory, this ordering is reversed with the TZ2P+f SCF and DZP CISD methods.

Original languageEnglish
Pages (from-to)2923-2929
Number of pages7
JournalJournal of the American Chemical Society
Volume115
Issue number7
DOIs
Publication statusPublished - 1993 Apr 1

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Potential energy
Glycine
Amino acids
Hydrogen
Nitrogen
Carbon
Oxygen

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Hu, Ching-Han ; Shen, Mingzuo ; Schaefer, Henry F. / Glycine Conformational Analysis. In: Journal of the American Chemical Society. 1993 ; Vol. 115, No. 7. pp. 2923-2929.
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abstract = "Ab initio quantum mechanical methods, including the self-consistent field (SCF), single and double excitation configuration interaction (CISD), the single and double excitation coupled cluster (CCSD), and the single, double, and perturbative triple excitation coupled cluster [CCSD(T)] have been applied to five C5 conformers and four of their C1 counterparts on the potential energy hypersurface of glycine. A large basis set TZ2P+f designated H(5s2p1d/ 3s2p1d) and C,N,O(10s6p2d1f/5s3p2d1f) was chosen to evaluate the importance of d functions on hydrogen and f functions on carbon, nitrogen, and oxygen. A very subtle feature of the glycine potential energy hypersurface is the out-of-plane bending of the C5 structures II (to C\ structure III) and IV (to C1 structure V). Conformer I is the global minimum at all levels of theory. Two of our results are different from previous ab initio predictions: structure II/III is lower in energy than structure IV/V at our highest level of theory, and should be identified as the second minimum. Secondly, although the C1 structure V lies slightly below its C5 counterpart IV at the DZP SCF and TZ2P SCF levels of theory, this ordering is reversed with the TZ2P+f SCF and DZP CISD methods.",
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Glycine Conformational Analysis. / Hu, Ching-Han; Shen, Mingzuo; Schaefer, Henry F.

In: Journal of the American Chemical Society, Vol. 115, No. 7, 01.04.1993, p. 2923-2929.

Research output: Contribution to journalArticle

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