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Ligand effects in cis-Ru-II(N-N)(2)L-2 species where N-N is a substituted 2,2 '-bisoxazoline and L is monodentate

Drew, M. G. B., Nag, S., Pal, P. K. and Datta, D. (2009) Ligand effects in cis-Ru-II(N-N)(2)L-2 species where N-N is a substituted 2,2 '-bisoxazoline and L is monodentate. Inorganica Chimica Acta, 362 (1). pp. 253-258. ISSN 0020-1693

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To link to this item DOI: 10.1016/j.ica.2008.02.003


Starting from previously reported cis-Ru(MeL)(2)Cl-2, where MeL is 4,4,4',4'-tetramethyl-2,2'-bisoxazoline, cis-Ru(MeL)(2)Br-2 (1), cis-Ru( MeL)(2)I-2 (2), cis-Ru(MeL)(2)(NCS)(2) center dot H2O (3), cis-Ru(MeL)(2)(N-3)(2) (4) and cis-[Ru(MeL)(2)(MeCN)(2)](PF6)(2) center dot (CH3)(2)CO (5) are synthesised. The X-ray crystal structures of complexes 1, 2, 3 and 5 have been determined. All the five new complexes have been characterized by FTIR, ESIMS and H-1 NMR. In cyclic voltammetry in acetonitrile at a glassy carbon electrode, the complexes display a quasireversible Ru(II/III) couple in the range 0.32-1.71 V versus NHE. The Ru(II/III) potentials yield a satisfactorily linear correlation with Chatt's ligand constants P-L for the monodantate ligands. From the intercept and by comparing the known situation in Ru(2,2'-bipyridine)(2)L-2, it is concluded that MeL, a non-aromatic diimine, is significantly more pi-acidic than 2,2'-bipyridine. (c) 2008 Elsevier B.V. All rights reserved.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11226
Uncontrolled Keywords:Ruthenium, Oxazoline, Crystal structures, Ligand constant, pi-Acidity, ELECTRON-TRANSFER, COMPLEXES, CONSTANTS, RUTHENIUM(III), RU(II), CATION

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