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Synthesis, Spectral and Electrochemical Properties and DFT Studies of Two Complexes of Ruthenium with Bis-2,3-(2-Pyridyl)Pyrazine and 4-Picoline

By Chhandasi Guharoy Sarkar


Reaction of bis-2,3-(2-pyridyl)pyrazine (L) with [Ru(dmso)4Cl2] in presence of 4-picoline (L1) affords mixed- ligand complexes of the type [Ru2L(L1)4Cl4] in which ligand, L binds to the metal center in the bridging, bidentate N,N fashion forming two five-membered chelate rings. Along with [Ru2L(L1)4Cl4], another complex of the type [Ru(L1)2(dmso)2Cl2] is formed. All the complexes are diamagnetic, and show characteristic 1H NMR signals and intense MLCT transitions in the visible region. DFT studies reveal that the HOMO of the complexes is mostly based on the metal center while the LUMO has maximum contribution from the bonded 4-picoline ligand. Cyclic voltammetry on these complexes shows a Ru(II)-Ru(III) oxidation on the positive side of SCE followed by a reduction of the coordinated 4-picoline ligand on the negative side of SCE.\ud \u

Topics: bis-2;3-(2-pyridyl)pyrazine, [Ru(dmso)4Cl2], spectral and electrochemical properties, DFT studies, Chemistry, QD1-999, Science, Q
Publisher: Oriental Scientific Publishing
Year: 2016
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