Abstract
HETEROLEPTIC TRIS CHELATES OF RUTHENIUM(II): RU-1,10-PHENANTHROLINE-OXINE-RAAIR: THE SYNTHESIS, SPECTRAL STUDY AND ELECTROCHEMISTRY OF (8-QUINOLINOLATO)-(1,10-PHENANTHROLINE)-{1-ALKYL-2-(ARYLAZO)IMIDAZOLE} RUTHENIUM(II) HEXAFLUOROPHOSPHATE

Prithwiraj Byabartta*

ABSTRACT

The reaction of [Ru(OH2)2(RaaiR/)(1,10-phenanthroline)]2+ [RaaiR/ = 1-alkyl-2-(arylazo)imidazole, p-R-C6H4-N=N-C3H2NN(1)-R/, R = H (1), Me (2), Cl (3); R/ = Me (a), Et (b), CH2Ph (c)] with 8-quinolinol (HQ) in acetone solution followed by the addition of NH4PF6 has afforded violet coloured mixed ligand complexes of the composition [Ru(Q)(RaaiR/)(1,10-phenanthroline)](PF6). The structure of [Ru(OXINE)(MeaaiMe)(1,10-phenanthroline](PF6) (2a) has been confirmed. The solution electronic spectra exhibit a strong MLCT band at 560-580 nm in MeCN. Cyclic voltammograme show a Ru(III)/Ru(II) couple at 1.0-1.1 V versus SCE along with three successive ligand reductions. The electronic properties are correlated with EHMO results.

Keywords: Ruthenium(II); 1-Alkyl-2-(arylazo)imidazole; 8-Quinolinol; Electrochemistry.


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