Ghatak, Natun ; Bhattacharya, Samaresh (1994) Ruthenium picolinates. Synthesis, characterization and reactivities of some picolinate complexes of ruthenium(II) Polyhedron, 13 (21). pp. 2999-3004. ISSN 0277-5387
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...
Related URL: http://dx.doi.org/10.1016/S0277-5387(00)83420-8
Abstract
Reaction of Ru(PPh3)3X2 (X = Cl, Br) with equimolar picolinic acid (Hpic) in dichloromethane solution at ambient temperature gave diamagnetic [Ru(PPh3)2(pic)(H2O)X], which in solution showed intense absorption bands in the visible region assigned to MLCT transitions. Each complex displayed a reversible ruthenium(II)-ruthenium(III) oxidation near 0.60 V vs SCE. Reaction of [Ru(PPh3)2(pic)(H2O)X] with base eliminated a molecule of HX and then dimerized to produce the hydroxo-bridged [{Ru(PPh3)2(pic)(OH)}2] complex. In solution it showed intense MLCT transitions in the visible region. Two successive quasi-reversible ruthenium(II)-ruthenium(III) oxidations were observed in this dimer at 0.75 V and 1.01 V vs SCE. Reaction of Ru(PPh3)3X2 with two equivalents of Hpic in refluxing ethanol afforded [Ru(PPh3)2(pic)2]. This diamagnetic complex exhibited several intense MLCT transitions in solution. The ruthenium(II)-ruthenium(III) oxidation took place reversibly at 0.54 V vs SCE in this complex.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 1941 |
| Deposited On: | 08 Oct 2010 11:18 |
| Last Modified: | 24 Jan 2011 04:02 |
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