Ruthenium(II/III) mediated transformation of 1,2-bis(2′-pyridylmethyleneimino)benzene (L) to 2-(2′-benzimidazolyl)pyridine (L′H) and its in situ formed complexes with Ru(II): X-ray structure of trans-[Ru(PPh3)2(L′H)2](ClO4)2 |
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| Authors: | Dipankar Mishra Raymond J Butcher |
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| Institution: | a Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah-711 103, India
b Department of Chemistry, University of Howard, 525 College Street, NW, Washington, DC 20059, USA |
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| Abstract: | A series of ruthenium (II) complexes of formulae trans-Ru(PPh3)2(L′H)2](ClO4)2 (1), Ru(bpy)(L′H)2](ClO4)2 (2), Ru(bpy)2(L′H)](ClO4)2 (3), cis-Ru(DMSO)2(L′H)2]Cl2 (4), and Ru(L′H)3](PF6)2 (5) (where L′H = 2-(2′-benzimidazolyl)pyridine) have been synthesized by reaction of the appropriate ruthenium precursor with 1,2-bis(2′-pyridylmethyleneimino)benzene (L). The complexes were characterized by elemental analyses, spectroscopic and electrochemical data. All the complexes were found to be diamagnetic and hence metal is in +2 oxidation state. The molecular structure of trans-Ru(PPh3)2(L′H)2](ClO4)2 has been determined by the single crystal X-ray diffraction studies. The molecular structure shows that Ru(II) is at the center of inversion of an octahedron with N4P2 coordination sphere. The ligand acts as a bidentate N,N′donor. The electronic spectra of the complexes display intense MLCT bands in the visible region.Cyclic voltammetric studies show quasi-reversible oxidative response at 0.99-1.32 V (vs Ag/AgCl reference electrode) due to Ru(III)/Ru(II) couple. |
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| Keywords: | Ruthenium 1 2-Bis(2&prime -pyridylmethyleneimino)benzene 2-(2&prime -benzimidazolyl)pyridine X-ray structure |
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