UNSPECIFIED (2003) Inclusion of the ligand field contribution in a polarizable molecular mechanics: SIBFA-LF. JOURNAL OF COMPUTATIONAL CHEMISTRY, 24 (16). pp. 1963-1970. ISSN 0192-8651

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Abstract

To account for the distortion of the coordination sphere that takes place in complexes containing open-shell metal cations such as Cu(II), we implemented, in sum of interactions between fragments ab initio, computed (SIBFA) molecular mechanics, an additional contribution to take into account the ligand field splitting of the metal d orbitals. This term, based on the angular overlap model, has been parameterized for Cu(II) coordinated to oxygen and nitrogen ligands. The comparison of the results obtained from density functional theory computations on the one hand and SIBFA or SIBFA-LF on the other shows that SIBFA-LF gives geometric arrangements similar to those obtained from quantum mechanical computations. Moreover, the geometric improvement takes place without downgrading the energetic agreement obtained from SIBFA. The systems considered are Cu(II) interacting with six water molecules, four ammonia or four imidazoles, and four water plus two formate anions. (C) 2003 Wiley Periodicals, Inc.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	JOURNAL OF COMPUTATIONAL CHEMISTRY
Publisher:	JOHN WILEY & SONS INC
ISSN:	0192-8651
Date:	December 2003
Volume:	24
Number:	16
Number of Pages:	8
Page Range:	pp. 1963-1970
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9175

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