Synthesis and characterization of some iridium(III) complexes with N-donor ligands

Iridium(III) chloride is found to form complexes of types (LH)(2)[IrCl5L] and (L'H)[IrCL4L'(2) ] and (L''H)(3)[IrCl6](.)2H(2)O, where 2 L = 2-methylimidazole (2-Melm), 2-ethylimidazole (2-EtIm), I-methylimidazole (1-Melm), 1-n-butylimidazole (1-n-Bulm), 1,2-dimethylimidazole; L' = imidazole (Im), 1,2-dimethyl-5- nitroimidazole (1,2-Me-2-5-NO(2)Im) and L" = (alpha-picoline(alpha-pic), beta-picoline (beta-pic), gamma-picoline (gamma-pic). The compounds have been characterized by elemental analyses, molar conductance measurements and IR, UV-visible and H-1 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. 900degreesC in some cases.