Chemistry and Physics Faculty Articles

Title

Ligand Effects on the δ → δ* Band Energies and Intensities in a Series of Diimine Complexes of Dimolybdenum

Document Type

Article

Publication Date

8-1996

Publication Title

Polyhedron

ISSN

0277-5387

Volume

15

Issue/No.

15

First Page

2597

Last Page

2606

Abstract

The complexes Mo2X4(diimine)2 (X = Cl, Br, I and diimine = 2,2′-bipyridine, 4,4′-dimethyl-2,2′-bipyridine, 2,2′-bipyrazine, 3,3′-bipyridazine, 2,2′-bipyrimidine, 1,10-phenanthroline and 4,7-diphenyl-1,10-phenanthroline) have been prepared by reaction of Mo2 (OAc)4with (CH3)3SiX in the presence of excess diimine. The product complexes apparently contain non-bridged quadruple molybdenum—molybdenum bonds. Each molybdenum is coordinated to a bidentate diimine and two halogen atoms. Electronic absorption and electrochemical studies have shown that shifts in the energy of the δδ* band are affected by the mixing of this transition with a metal-to-ligand charge transfer transition, probably a δπ* transition. It was also found that the compounds Mo2X4(diimine)2 react slowly with oxygen to form Mo2O4Cl4(diimine)2 and then MoO2Cl2(diimine). The crystal and molecular structure of MoO2Cl2(4,4′-dimethyl-2,2′bipyridine), determined by a three-dimensional X-ray diffraction study, is reported.

Comments

Data Set for this article found on the Cambridge Crystallographic Data Centre.

Additional Comments

Copyright © 1995 Published by Elsevier Ltd.

DOI

10.1016/0277-5387(95)00535-8

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