Chromium, molybdenum and ruthenium complexes of 2-hydroxyacetophenone Schiff bases

Interaction of the Schiff base 2-hydroxyacetophenonepropylimine (happramH) with M(CO)(6), M = Cr or Mo under reduced pressure gave the dicarbonyl complex M(CO)(2)(happramH)(2). The complex MoO(happram)(2) was isolated from the reaction of Mo(CO)(6) and happramH in air. Ru-3(CO)(12) and RuCl3 reacted with the Schiff base bis-(2-hydroxyacetophenone)ethylenediimine (hapenH(2)) to give Ru(CO)(2)(hapenH(2)) and [RuCl2(hapenH(2))]Cl. Elemental, spectroscopic and magnetic studies of the reported complexes revealed the proposed structures. The thermal properties of the complexes were investigated by thermogravimetric techniques. Cyclic voltammetry of the complexes showed tautomeric redox processes due to ligand-based reduction and metal-based oxidation.