The Syntehesis and Ligand Properties of Potassium Hydrotris- and Tetrakis (5-Nitroindazolyl) Borates

Abstract

The synthesis and characterization of two new ligands, potassium hydrotris (5-nitroindazolyl) borate (2) have been achieved. Complexes of (1) with the first row divalent transition metal ions chromium through copper, as well as with palladium and platinum have been prepared, while for (2) complexes with divalent nickel, palladium and tetravalent platinum have been synthesized. All these complexes were formed in 1:2 metal:ligand molar ratio excepting for nickel with ligand (2) which yields a 1:1 complex. These complexes were all non-electrolytes in DMF, the only solvent in which they were soluble. Magnetic susceptibility measurements and ligand field spectral studies indicate an octahedral geometry for all the complexes excepting those of platinum (II) and palladium (II) which have been shown to have a square planar geometry. Some ligand field parameters have been evaluated for a few of these complexes with the help of Tanabe-Sugano diagrams.