Taqui Khan, M. M. ; Mizra, S. A. ; Shaikh, Z. A. ; Sreelatha, Ch. ; Paul, P. ; Shukla, R. S. ; Srinivas, D. ; Prakash Rao, A. ; Abdi, S. H. R. ; Bhatt, S. D. ; Ramachandraiah, G. (1992) Dioxygen affinities of some ruthenium(III) schiff base complexes Polyhedron, 11 (14). pp. 1821-1827. ISSN 0277-5387
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0277-5387(00)83245-3
Abstract
The synthesis and dioxygen affinities of some ruthenium(III) Schiff base complexes in DMF solution in the presence of different axial bases are reported. The ligands used are bis(salicylaldehyde)ethylenediimine (salen), bis(salicylaldehyde)diethylenetriimine (saldien), bis(picolinaldehyde)-o-phenylenediimine (picoph), bis(picolinaidehyde)ethylenediimine (picen) and bis(picolinaldehyde)diethylenetriimine (picdien). The axial ligands employed are chloride (Cl−), imidazole (Im) and 2-methylimidazole (2-MeIm). From the oxygenation constants it is found that electron donating substituents on the Schiff bases increase the affinity for dioxygen. Equilibrium dioxygen uptake measurements at 278, 288 and 303 K provide values of ΔH° and ΔS° of oxygenation that fall in the range -6.1 to -13.3 kcal mol−1 for ΔH° and -10 to -31 cal deg−1 mol−1 for ΔS°. The dioxygen adducts of RuIII were characterized by electrochemistry, UV-vis, IR and EPR techniques as RuIV superoxo complexes.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
ID Code: | 58539 |
Deposited On: | 31 Aug 2011 12:22 |
Last Modified: | 31 Aug 2011 12:22 |
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