Synthesis, Spectral, Thermal and Magnetic Studies of Chromium and Molybdenum Carbonyl Complexes Containing N2O2 Donor Sites

Transition metal compounds containing Schiff base ligands have been of great interest for many years [1]. In particular, complexes with N2O2 Schiff bases have been widely reported [2-4] and used as biological models to understand the structures of biomolecules and biological processes [5,6]. Their instant and enduring popularity undoubtedly stems from the ease with which they can be synthesized, their puzzling versatility and their wide ranging complexing ability once formed. These compounds play an important role in the coordination chemistry related to catalysis and enzymatic reactions, magnetism and molecular architectures [7]. Not only have they played a seminal role in the development of modern co-ordination chemistry [8], but they can also be found at key points in the development of inorganic biochemistry [9], catalysis [10, 11], medical imaging [12], optical materials [13] and thin films [14, 15]. As a continuation of our previous work dealing with the study of the interaction of metal carbonyl with Schiff bases [16-21], we report here the synthesis and characterization of M (CO)6 (M=Cr or Mo) with bis-(salicylaldehyde) ethylendiimine (salenH2) in presence of 2-aminobenzothiazole, thiourea or triphenylphosphine. 2. EXPERIMENTAL