Add time:07/26/2019         Source:sciencedirect.com

A series of mixed-tris complexes of general formula [ML′L2](ClO4)2·H2O [M = Ru or Os; L′ = 2,2′-bipyrazine (bpyz) or 2,2′-bipyrimidine (bpym) and L = 2-(phenylazo)pyridine (papy) or 2-(m-tolylazo)pyridine (tapy)] has been prepared and characterized by physicochemical and spectroscopic methods. Using 1H NMR results (δMe of tapy), stereochemistry of ML2 fragment in these tris chelates has been determined. The complexes show a number of MLCT transitions in the visible region; the low intensity spin-forbidden transitions are observable in osmium complexes. In MeCN solution, the OsN6 unit displays one metal-centred oxidation and multiple ligand-based reductions. Relative π-acceptor ability of the ligands is clearly reflected in the electrochemical results.

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