摘要:
Reactions of 2-(arylazo) aniline, HL [H represents the dissociable protons upon orthometallation and HL is p-RC6H4N = NC6H4-NH2; R = H for HL1; CH3 for HL2 and Cl for HL3] with Ru(R-1-tpy)Cl-3 (where R-1-tpy is 4'-(R-1)-2,2',6 '',2 ''-terpyridine and R-1 = H or 4-N, N-dimethylaminophenyl or 4-methylphenyl) afford a group of complexes of type [Ru(L)(R-1-tpy)]center dot ClO4 each of which contains C, N, N coordinated L-as a tridentate ligand along with a terpyridine. Structure of one such complex has been determined by X-ray crystallography. All the Ru(II) complexes are diamagnetic, display characteristic H-1 NMR signals and intense d pi(Ru-II) -> pi*(tpy) MLCT transitions in the visible region. Cyclic voltammetric studies on [Ru(L)(R-1-tpy)]center dot ClO4 complexes show Ru(II)-Ru(III) oxidation within 0.63-0.67 V versus SCE. (C) 2009 Elsevier B. V. All rights reserved.