Pramanik, Nimai Chand ; Bhattacharya, Samaresh (1999) Synthesis, characterization and redox properties of mono- and bis-β-diketonate ruthenium complexes Transition Metal Chemistry, 24 (1). pp. 95-99. ISSN 0340-4285
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Official URL: http://www.springerlink.com/content/n721241281rv84...
Related URL: http://dx.doi.org/10.1023/A:1006954015738
Abstract
Complexes of the type [RuIII(L)Cl2(PPh3)2] and [RuII(L)2(PPh3)2] (HL=benzoylacetone or acetylacetone) have been synthesized by the reaction of [RuCl2(PPh3)3] with HL under various experimental conditions. The [RuIII(L)Cl2(PPh3)2] complexes are one-electron paramagnetic species and, in solution, they show intense LMCT transitions in the visible region together with weak ligand-field transitions at lower energies. The [RuII(L)2(PPh3)2] complexes are diamagnetic and their solutions show sharp 1H n.m.r. signals and also show intense MLCT transitions in the visible region. In MeCN solution, the [RuIII(L)Cl2(PPh3)2] complexes show a reversible RuIII-RuII reduction near -0.3V and an irreversible RuIII- RuIV oxidation near 1.2 V versus s.c.e. A reversible RuII-RuIII oxidation is displayed by the [RuII(L)2(PPh3)2] complexes in MeCN solution near 0.3 V versus s.c.e. followed by another reversible RuIII-RuIV oxidation near 1.1 V versus s.c.e. The [RuII(L)2(PPh3)2] complexes have been oxidized to the corresponding [RuIII(L)2(PPh3)2]+ analogues and isolated as ClO4- salts in the solid state. The oxidized complexes are one-electron paramagnetic. They are 1¦1 electrolytes in solution and show intense LMCT transitions in the visible region along with weak ligand-field transitions at lower energies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Springer-Verlag. |
| ID Code: | 1972 |
| Deposited On: | 08 Oct 2010 09:39 |
| Last Modified: | 21 Jan 2011 11:26 |
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