Baitalik, Sujoy ; Dutta, Bula ; Nag, Kamalaksha (2004) Spectroscopic and redox properties of RhIIIRuII and RuIIRuII complexes derived from 2,2'-bipyridine, pyrazole-3,5-bis(benzimidazole) and 1,2,4-triazole-3,5-dicarboxylic acid as bridging ligands Polyhedron, 23 (6). pp. 913-919. ISSN 0277-5387
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...
Related URL: http://dx.doi.org/10.1016/j.poly.2003.09.035
Abstract
The heterovalent heterodinuclear complex [(bpy)2RuII(H2pzbzim)RhIII(bpy)2](ClO4)4· 3H2O (1) and the isovalent homodinuclear complex [(bpy)2RuII(trzdc)RuII(bpy)2](ClO4)·5H2O (2), where H3pzbzim=pyrazole-3,5-bis(benzimidazole), H3trzdc=1,2,4-triazole-3,5-dicarboxylic acid and bpy=2,2'-bipyridine, have been synthesized and spectroscopically characterized. Complex 1 undergoes one electron oxidation at 1.20 V (versus Ag/AgCl) in acetonitrile, while for complex 2, two stepwise oxidations occur at 0.63 and 0.81 V with the comproportionation constant Kc, for the equilibrium RuIIRuII + RuIIIRuIII⇔2RuIIRuIII, equal to 1.11×103 at 298 K. The acid dissociation constants of the benzimidazole moieties of complex 1 have been determined in acetonitrile-water (3:2) by spectrophotometric titrations. Both complexes 1 and 2 exhibit luminescence spectra and the quantum yields obtained for methanol-ethanol (1:4) glass (at 77 K) are φ=3.1×10-2 for 1 and 3.5 × 10-2 for 2. The heterodinuclear complex [(bpy)2RuII(H2pzbzim)RhIII(bpy)2](ClO4)4· 3H2O and the homodinuclear complex [(bpy)2RuII(trzdc)RuII(bpy)2](ClO4)·5H2O have been synthesized and characterized by their IR, UV-Vis, luminescence and 1H NMR spectra. The redox behavior of the complexes has been studied.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Diruthenium(II); Rhodium(III) Ruthenium(II); Heterodinuclear Complexes; Polypyridine Complexes; Electrochemistry |
| ID Code: | 22746 |
| Deposited On: | 24 Nov 2010 07:56 |
| Last Modified: | 22 Jan 2011 17:55 |
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