Rhodium(III) complexes derived from complexation of metal with azomethine linkage of chitosan biopolymer Schiff base ligand: Spectral, thermal, morphological and electrochemical studies.

Rhodium(III) complexes such as [Rh(Chi4Hy3mb)(H2O)2]Cl2, [Rh(Chi2Hymb)(H2O)2]Cl2, and [Rh(Chi2Hy3mb)(H2O)2]Cl2 were synthesized by metal chelation/complexation with chitosan Schiff base ligands. Stable Schiff base ligands were prepared by chemical modification of chitosan with aromatic aldehydes such as vanillin, salicylaldehyde and orthovanillin. These chitosan based Schiff base ligands were performed as bidentate ligands through azomethine nitrogen atom and methoxy/hydroxy oxygen atom. These bidentate ligands were favoured to the formation of stable coordination complex with metal ions. The series of Rhodium(III) complexes were characterized by Elemental analysis, FT-IR, UV-Vis spectroscopy, P-XRD and Thermo-gravimetric analysis (TGA). The electrochemical property of Rhodium(III) complexes were analyzed by cyclic voltametry.