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Formation of a covalently-linked bimetallic compound upon irradiation of tris(1,4,5,8-tetraazaphenanthrene)ruthenium(II) in the presence of 5′-guanosine-monophosphate

1999; Elsevier BV; Volume: 2; Issue: 4 Linguagem: Inglês

10.1016/s1387-7003(99)00030-1

1879-0259

Luc Jacquet, John M. Kelly, Andrée Kirsch‐De Mesmaeker,

Lanthanide and Transition Metal Complexes

Abstract A new type of binuclear Ru(II) complex [Ru(TAP)2(TAP-TAP)Ru(TAP)2]4+ (1) (TAP-TAP=2,2′-bis(1,4,5,8-tetraazaphenanthrene)) produced by photo-reaction of Ru(TAP)32+ in the presence of 5′-guanosine-monophosphate (5′-GMP) has been isolated and characterised. The formation of 1 is proposed to proceed via mono-reduced Ru(TAP)32+, i.e. [Ru2+(TAP)2(TAP⋅−)]+. The emission lifetime of 1 is much greater than that of Ru(TAP)32+, consistent with an increased energy gap between the 3MLCT and 3MC states in 1. This arises because of stabilisation of its 3MLCT state due to the localisation of the excited state electron on the TAP-TAP ligand.