title: Synthesis, characterization, electrochemical and photophysical properties of elbow-shaped trinuclear Ru(II) complexes, building blocks for novel supramolecular constructions.
abstract: Three trinuclear elbow-shaped Ru(II) complexes based on the non symmetrical bridging PHEHAT ligand (PHEHAT = 1,10-phenanthrolino[5,6-b]-1,4,5,8,9,12-hexaazatriphenylene) have been prepared and characterized by NMR, electrochemistry, absorption and emission spectroscopy. It is shown that the dichloro trinuclear complex 1 should behave as an excellent precursor for the synthesis of larger species. Indeed, it reacts easily with 1,10-phenanthroline (phen) and 1,4,5,8-tetraazaphenanthrene (TAP) and leads to the trinuclear compounds 2 and 3, respectively. The electrochemical and emission studies indicate that for 2 and 3, there is an intramolecular energy transfer from the center to the periphery of the elbow-shaped trinuclear complex, whereas for complex 1 the energy transfer takes place in the other direction.
authors: Service de Chimie Organique et Photochimie, CP 160/08, Université Libre de Bruxelles, (U. L. B.), 50 Avenue F.D. Roosevelt, B-1050, Bruxelles, Belgium.
authors: Arnaud
authors: A
authors: Boisdenghien
authors: Julien
authors: J
authors: Leveque
authors: Cécile
authors: C
authors: Moucheron
authors: Andrée
authors: A
authors: Kirsch-De Mesmaeker