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Volumn 17, Issue 5-6, 1996, Pages 587-615

Merck molecular force field. IV. Conformational energies and geometries for MMFF94

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EID: 0001061464     PISSN: 01928651     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1096-987X(199604)17:5/6<587::AID-JCC4>3.0.CO;2-Q     Document Type: Article
Times cited : (874)

References (92)
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    • note
    • 2.
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    • note
    • The QCISD(T) (quadratic configuration interaction) method as implemented in Gaussian 92 (ref. 10) includes the fourth-order triples contribution to the energy; these contributions are computed after the QCISD energy has converged.
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    • This work was done on the Merck Research Laboratories' Cray YMP8i 4/128.
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    • Appendix A is available in Supplementary Material (see footnote * on the first page of this article).
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    • note
    • As discussed in the "MMFF Torsion Parameters" section, each torsion parameter actually carries a fifth numerical index corresponding to the "torsion type." For simplicity, this dependence is suppressed in the present context.
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    • note
    • 0 represents the change needed in the MMFF torsional energy contribution.
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    • For MM2X, we omitted eight comparisons for structures near the "syn" and "anti" transition states for C-N rotation in N-methylformamide used in parameterizing and evaluating MMFF. MM2X gives reasonable energies for some of these structures, but others collapse to structures not representative of the transition state region. Inclusion of these structures would increase the rms deviation and the rms value for "conformational energies" to 2.07 and 3.99 kcal/mol, respectively.
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    • i -10 were used in eq. (2) to ensure that the torsion parameters would reproduce the conformational energy differences for cyclohexanol as well as possible.
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    • note
    • The MMFF94 parameters are included in Appendix B in the Supplementary Material for part I (ref. 1) and are available in computer-readable ASCII format.
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    • note
    • In the current OPTIMOL implementation, these quantities are set to 6 and 136, respectively, to insure that the maximum value computed for CXT will fit within a 32-bit integer word.
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    • note
    • 1 for citations to some of this work.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.