PUMA publications for /user/b_schwederski/heterodinuclear%20ruthenium%20complex;molybdenum%20complex;copper%20complex;ruthenium%20transitionMon Jul 15 13:41:23 CEST 2019Inorganica Chimica Acta115--21Electronic structure of heterodinuclear complexes (bpy)2RuII(\textgreek{m}-bpym)MLn; bpy = 2,2'-bipyridine; bpym = 2,2'-bipyrimidine; MLn = Cu(PPh3)2, Mo(CO)4, Re(CO)3Cl1811991bipyridine ESR heterobinuclear complex;ruthenium heterobinuclear;rhenium electrochem complex metal complex;molybdenum heterodinuclear bipyrimidine transition ruthenium complex;redox complex;copper [(Bpy)2Ru(\textgreek{m}-bpym)Cu(PPh3)2](PF6)2 (bpy = 2,2'-bipyridine, bpym = 2,2'-bopyrimidine) and [(bpy)2Ru(\textgreek{m}-bypm)Mo(CO)4](PF6)2 were prepd. (Bpy)2Ru(\textgreek{m}-bpym)MLn (MLn = Cu(PPh3)2, Mo(CO)4, Re(CO)3Cl) were studied by cyclic voltammetry, absorption spectroscopy, and by ESR of their singly reduced forms. Comparison with the homodinuclear analogs reveals that the metal-centered occupied d orbitals show relatively little change on coordination of a second metal (weak interaction) whereas the bpym-centered lowest unoccupied MOs \textgreek{p}*1 and \textgreek{p}*2 are stabilized by effects coming from both metal fragments. Combinations of metal fragments with different \textgreek{p} donor/\textgreek{s} acceptor characteristics give rise to variable charge transfer energies for major transitions d(Ru) $\rightarrow$ \textgreek{p}*1, d(M) $\rightarrow$ \textgreek{p}*1, d(Ru) $\rightarrow$ \textgreek{p}*2; the appearance of spectra is further detd. by different widths and intensities of individual bands and by solvent dependence. [on SciFinder(R)]