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• W2034722588 abstract "Sämtliche Homo- und Hetero-Zweikernkomplexe (LnM)(μ-bpym)(MLn)′, bpym = 2,2′-Bipyrimidin, MLn(MLn)′ = Mo(CO)4, Re(CO)3Cl, [Cu(PPh3)2]+ und [Ru(bpy)2]2+ wurden synthetisiert und mittels cyclischer Voltammetrie, Absorptions-Spektroskopie sowie durch Elektronenspinresonanz der reduzierten Stufen untersucht. Die Fähigkeit der einzelnen Metallfragmente, selbst oxidiert zu werden und die Reduktion des π-Acceptor-Liganden bpym durch Koordination zu erleichtern, führt in Kombination zu variablen Redoxpotential-Differenzen. Nach Berücksichtigung unterschiedlicher Franck-Condon-Faktoren und Absorptions-Intensitäten sowie weiterer niedrig liegender unbesetzter Molekülorbitale des Brückenliganden und der Lösungsmittelabhängigkeit werden die sehr unterschiedlichen Metall-Ligand-Charge-Transfer-Übergänge im Sichtbaren zugeordnet. Homo- and Heterodinuclear Complexes of the D2h-symmetric Bis(chelate) Ligand 2,2′-Bipyrimidine with Electron-Rich Metal Fragments Mo(CO)4, Re(CO)3Cl, [Cu(PPh3)2]+, and [Ru(bpy)2]2+ All homo- and heterodinuclear complexes (LnM)(μ-bpym)(MLn)′, bpym = 2,2′-bipyrimidine, MLn (MLn)′ = Mo(CO)4, Re(CO)3Cl, [Cu(PPh3)2]+, [Ru(bpy)2]2+, have been synthesized and studied by cyclic voltammetry, absorption spectroscopy, and by electron spin resonance of singly reduced forms. The individual capabilities of the low-valent metal fragments to undergo oxidation and to shift the reduction potential of the bpym π acceptor ligand on coordination combine to result in variable electrochemical potential differences. After consideration of different Franck-Condon factors, absorption intensities, additional low-lying unoccupied orbitals of the bridging acceptor ligand and solvatochromic effects, we have assigned the considerably varying metal-to-ligand charge transfer transitions in the visible." @default.
• W2034722588 created "2016-06-24" @default.
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• W2034722588 date "1991-02-01" @default.
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• W2034722588 title "Homo- und Hetero-Zweikernkomplexe des D2h-symmetrischen Bis(chelat)-Liganden 2,2?-Bipyrimidin mit den elektronenreichen Metallfragmenten Mo(CO)4, Re(CO)3Cl, [Cu(PPh3)2]+ und [Ru(bpy)2]2+" @default.
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• W2034722588 doi "https://doi.org/10.1002/zaac.19915930114" @default.
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