Journal
INORGANICA CHIMICA ACTA
Volume 359, Issue 8, Pages 2369-2374Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2006.02.037
Keywords
arene complexes; chloro complexes; aqua complexes; phenanthroline complexes; ruthenium; hydrogen transfer reduction; cyclic voltammetry
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The electrochemical properties of cationic complexes [(eta(6)-arene)Ru(N boolean AND N)Cl]Cl (arene/N boolean AND N = C6H6/1,10-phenanthroline (1), p-MeC6H4Pr'/1,10-phenanthroline (2), C6Me6/1,10-phenanthroline (3), C6W6/5-NO2-1,10-phenanthroline (4), and C6Me6/5-NH2-1,10-phenanthroline (5)) were studied by cyclic voltammetry in order to rationalize catalytic activity in transfer hydrogenation of the respective aqua complexes [(eta(6)-arene)Ru(N boolean AND N)(OH2)](BF4)(2) (6-10). Complexes 1-5 were chosen because the 'true' catalysts 6-10 are unstable under the conditions of the measurement. The electrochemical behaviour of 1-5 in acetonitrile solution is rather complicated due to consecutive and parallel chemical reactions that accompany electron transfer processes. Nonetheless, interpretation of the electrochemical data allowed to assess the influence of the structure and substitution on the redox and catalytic properties: the catalytic ability correlates with the reduction potentials, indicating the decisive role of the eta(6)-arene ring directly bonded to the catalytic centre (Ru). (c) 2006 Elsevier B.V. All rights reserved.
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