¦Ì-Halo bridged binuclear ruthenium(III) complexes featuring pyridazine ligands: Synthesis, structure, spectral and electrochemical properties
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- 作者：Devaraj Pandiarajan ; Rengan Ramesh ; ramesh_bdu@yahoo.com
- 关键词：Binuclear ruthenium(III) ; Pyridazine ligand ; Crystal structure ; Redox behavior
- 刊名：Polyhedron
- 出版年：2012
- 出版时间：28 February, 2012
- 年：2012
- 卷：34
- 期：1
- 页码：136-142
- 全文大小：478 K
文摘
The reaction of [RuX3(AsPh3)3] and N,N-disubstituted pyridazine-3,6-diamine in benzene under reflux afford novel binuclear, halo-bridged, ruthenium(III) complexes with the general formula [Ru2(AsPh3)2(¦Ì-X)2X4(L)] (X = Cl or Br; L = N,N-disubstituted pyridazine-3,6-diamine). All the complexes have been characterized by elemental analysis, spectral (UV-Vis, EPR) and electrochemical methods (CV, DPV). The electronic spectra of the complexes indicate the presence of d-d and intense LMCT transitions in the visible region. The molecular structure of one of the complexes (2) has been determined by X-ray crystallography, which indicates the bridging coordination of the pyridazine in these binuclear complexes. In complex (2) each metal has a distorted octahedral NCl4As coordination sphere constituted by the two exogenous bridging chlorides. The complexes are paramagnetic (low spin, d5) in nature and all the complexes at 77 K show rhombic distortion around the ruthenium ion with three different ?em>g?values (gx ?#xA0;gy ?#xA0;gz). All the complexes exhibit two quasi-reversible one electron reductive responses (RuIII-RuIII/RuII-RuIII; RuII-RuIII/RuII-RuII) within the E1/2 range of ?.68 to ?.78 V and ?.25 to ?.33 V, respectively, versus SCE.