A series of polypyridine ruthenium complexes of the general formula {Ru(Rph-tpy)[dppz(COOH)]Cl} PF6 with R = Br (1), Cl (2), NO 2 (3) where Rph-tpy is 4′-(4-Rphenyl-2,2′:6′, 2″-terpyridine and dppz(COOH) is dipyrido[3,2-a:2′,3′-c] ...