title: Electronic structure of diamagnetic and paramagnetic hexanuclear chalcohalide clusters of rhenium.
abstract: Hexanuclear chalcohalide clusters of rhenium(III) of general formula [Re(6)S(4+x)Cl(10-x)](x-) with x = 1-4 have been studied using quantum chemical DFT calculations. The optimized structures reproduce the geometrical features found from X-ray data for the members of the series. The relative stability of different stereoisomers for the mono- and dianions has been estimated. The analysis of the tetraanion series [Re(6)Q(8)X(6)](4-) with Q = S, Se and X = Cl, Br, I, and CN demonstrates the influence of the mu(1)- and mu( 3)-ligands on the strength of Re-apical ligand bond. It is shown that the tetragonal distortion found for the stable oxidized paramagnetic species [Re(6)S(8)Cl(6)]*(3-) results from the Jahn-Teller effect for a doubly degenerate electronic state.
authors.affiliation: Institut de Recherches sur la Catalyse, UPR 5401 CNRS, 2, Avenue Albert Einstein, 69626 Villeurbanne Cedex, France. adeluzet@ens-lyon.fr
authors.forename: André
authors.initials: A
authors.lastname: Deluzet
authors.forename: Hélène
authors.initials: H
authors.lastname: Duclusaud
authors.forename: Philippe
authors.initials: P
authors.lastname: Sautet
authors.forename: Serguei A
authors.initials: SA
authors.lastname: Borshch