Synthesis, characterization and redox behavior of isometric [OsA₂L₂] [A=NO<img src='http://www.niscair.res.in/jinfo/two.gif' border=0>, SCN^- or N<img src='/image/spc_char/3_bar.gif' border=0> and L = 2-(arylazo)pyridine complexes

Abstract

Both blue-violet (<strong>2</strong>) and red-violet (<strong>3</strong>) isomers of [OsX₂L₂] where X=Cl or Br; and L (<strong>1</strong>) = 2-</p> (arylazo)pyridine react smoothly with A (A=NO, SCN^- or N) in boiling aqueous ethanol affording species of the type [OsA₂L₂] (<strong>4</strong> and <strong>5</strong>, respectively). From spectral data the stereoretentivity of the reaction is proposed. The new complexes are electro active and display one metal-centred oxidation and successive ligand-based reductions in MeCN solutions. Chemical reactivity of these species is also studied.