Protected building blocks for lurrrinescent and redox-active dendritic metal complexes. Excited state properties and electrochemical behavior

The mononuclear complexes (Ru(2,3-~edpp)~) ~~, (~u(2,3-~edp~)~( bp~))~', and (Ru(2,3- ~edpp)(bp~)~)~+ and the dinuclear complex ((2,3-~ed~~)~~u( p-2,3-d~~)~u(2,3 -~ed~~)~)~ (bpy = 2,2'- bipyridine; 2,3-dpp = 2,3-bis(2-pyridy1)pyrazine; 2,3-Medpp' = monomethylated 2,3-bis(2-pyridy1)pyrazine) have been synthesized. Their absorption spectra, luminescence properties, and electrochemical behavior have been investigated and compared with those of the mononuclear (~u(bp~)~)~+, (~u(2,3-dpp)~)~+ , (Ru(2,3- dpp)2(bpy))2', and (~u(2,3-dpp)(bp~ )~)~ and the dinuclear ((bpy)2~u(p-2,3-dpp)~u(bpy)2)4+ parent (~u(2,3-~edp~)~( bp~))~+ et (~u(2,3-~edp~)(b py),)~' et le complexe dinucltaire ((2,3-~ed~~)~~u( p-2,3-d~~)~u(2,3 -~ed~~)~)~ (bpy = 2,2'-bipyridine; 2,3-dpp = 2,3-bis(2-pyridy1)pyrazine; 2,3-Medppf = 2,3-bis(2-pyridy1)pyrazine monomCthylC). On a examink leurs spectres d'absorption, leurs propriCtCs de luminescence et leurs comportements Clectrochimiques et on les a comparCs aux propriCtCs correspondantes des complexes parents mononuclCaires (~u(bp~)~)~~, (~u(2,3-dpp)~)~' , (~u(2,3-dpp)~(bp ~))~~ et (~u(2,3-dpp)(bp~ )~)~+ et dinuclCaire ((bpy)2~u(p-2,3-dpp)~u(bpy)2)4+. Les complexes CtudiCs sont les unitCs fondamentales dans la synthkse de complexes mttalliques polynuclCaires de structure dendrimtrique et de grosseur du nanomktre. Mots clis: luminescence, complexes du ruthCnium, dendrimkres, tlectrochimie, photochimie.

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