Abstract

Three novel asymmetrical tridentate ligands, 3-(1,10-phenanthrolin-2-yl)-5,6-diphenyl-as-triazine (dppt), 3-(1,10-phenanthrolin-2-yl)-as-triazino[5,6-f ]acenaphthylene (pta) and 3-(1,10-phenanthrolin-2-yl)-as-triazino[5,6-f ]phenanthrene (ptp) have been prepared. Their homoleptic ruthenium complexes [Ru(L)2]2+ (L = dppt, pta or ptp) and heteroleptic ruthenium complexes [Ru(tpy)(L)]2+ have been synthesized and characterized by 1H NMR, ES-MS, electronic absorption spectroscopy and cyclic voltammetry. The heteroleptic ruthenium complexes were also characterized by X-ray crystallography. The electrochemical and spectroscopic studies of the complexes display the changes in properties in comparison with [Ru(tpy)3]2+ owing to the structural differences.

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