Electrochemical probing of ground state electronic interactions in polynuclear complexes of a new heteroditopic ligand

The synthesis and electronic properties of dinuclear ([(bipy)(2)Ru(I)M(terpy)][PF6](4)(bipy = 2,2`-bipyridine, terpy = 2,2`: 6`, 2``-terpyridine; M = Ru, Os)) and trinuclear ([(bipy)(2)Ru(I)(2)M][PF6](6) M = Ru, Os, Fe, Co) complexes bridged by 4`-(2,2`-bipyridin-4-yl)-2,2`: 6`, 2``-terpyridine (I) have been investigated and are compared with those of mononuclear model complexes. The electrochemical analysis using cyclic voltammetry and differential pulse voltammetry reveals that there are no interactions in the ground state between adjacent metal centres. However, there is strong electronic communication between the 2,2`-bipyridine and 2,2`: 6``

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