Département de chimie moléculaire

A set of tricarbonylmanganese(I) complexes derived from three differently substituted terpyridyl (terpy) ligands was synthesized and characterized by various spectroscopic methods and single-crystal x-ray diffraction. The corresponding MnI dicarbonyl complexes, which are among the few examples of such compds. as yet described, were also prepd. The crystal structure of the Mn dicarbonyl species with the stabilizing p-tolyl-terpyridyl ligand was successfully obtained. The photochem. properties of all the tricarbonyl complexes were studied by using UV/visible, IR, and NMR spectroscopy as characterization techniques; this detailed study shows the ability of the tricarbonyl MnI complexes to release one molar equivalent of CO in a perfectly controlled manner, a property useful for potential CO-releasing mols. (CO-RMs). The decarbonylation reaction is irreversible, and notably differs from what the authors had previously obsd. for the corresponding bipyridyl analogs as far as the products and kinetics are concerned. The comparison of the rate of CO decoordination of the different complexes is discussed. [on SciFinder(R)]