Synthesis and Characterization of Some Iridium(III) Complexes with N-donor Ligands

Abstract

Iridium(III) chloride is found to form complexes of types (LH)₂[IrCl₅L] and (L'H)[IrCl₄L'₂] and (L"H)₃[IrCl₆]·2H₂O, where L = 2-methylimidazole (2-MeIm), 2-etbylimidazole (2-EtIm), 1-methylimidazole (1-MeIm), 1-n-butylimidazole (1-n-BuIm), 1,2-dimethylimidazole; L' = imidazole (Im), 1,2-dimethyl-5-nitroimidazole (1,2-Me₂-5-NO₂Im) and L" = α-picoline (α-pic), β-picoline (β-pic), γ-picoline (γ-pic). The compounds have been characterized by elemental analyses, molar conductance measurements and IR, UV-visible and ¹H NMR spectral studies. The compounds have octahedral geometry with pyridine nitrogen of imidazoles and picolines as donor site. Thermal studies indicate continuous loss of ligands with formation of Ir-metal at ca. 900°C in some cases.