A New Building Block for Polynuclear Complexes: the ion [Ru(CN)4(bptz)]2- (bptz = 3,6-Bis(2-pyridyl)-1,2,4,5-tetrazine)?

GARCÍA POSSE, MÓNICA E.; VERGARA, MÓNICA M.; FAGALDE, FLORENCIA; MELLACE, MARÍA G.; KATZ, NÉSTOR E.

Journal of the Argentine Chemical Society

Asociación Química Argentina

Lugar: Buenos Aires , Argentina; Año: 2004 vol. 92 p. 101 - 107

0365-0375

The synthesis and physicochemical properties of the new mononuclear ruthenium(II) complex, of formula Na2[Ru(bptz)(CN)4].4H2O (bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) are reported.  The IR and UV-vis spectral data, together with cyclic voltammetry measurements, indicate that the ligand bptz has a p-acceptor ability intermediate between dpp and bpz when coordinated to the tetracyanoruthenate(II) moiety (dpp = 2,3-bis(2?-pyridyl)pyrazine  ; bpz = 2,2?-bipyrazine). This complex can be used as a photosensitizer, since it emits at room temperature in alcoholic solutions, and as a building block for new polynuclear complexes, such as the symmetric  ion [(CN)4Ru(bptz)Ru(CN)4]4-, whose preparation and spectral properties in aqueous solutions are also described in this work