Thermal study of chromium and molybdenum complexes with some nitrogen and nitrogen-oxygen donors ligands

Abstract

The complexes of chromium and molybdenum with salicylidene-2-aminophenol (shaH2), salicylidene-2-aminoanisole (salanH2), salicylidene-2-aminoaniline (salphenH2) and biquinoline (biq) were studied using the thermogravimetric techniques. The thermal decomposition of all complexes was found to be first order reaction and the thermodynamic parameters corresponding to the different decomposition steps were reported. Molybdenum complexes were found to be more thermally stable and the order of stability was [Mo(CO)4(biq)]>[MoO(salphen)]>[MoO2(salphenH) 2]>[MoO4(salan)2]>[MoO(sha)]. Similar trend was found for chromium complexes where [Cr(CO)4(biq)] >[Cr(CO)2(salphen)] >[CrO2(CO)2(shaH 2)]>[CrO2(CO)2(salan)2]. © 2006 Akadémiai Kiadó, Budapest.