Synthesis and Characterization of Chromium(III), Molybdenum(II), Nickel(II), Palladium(II) and Platinum(II) Complexes, derived from Mixed Ligands of Pyrazole and 2,2-Bipyridine

The recent paper involves the synthesis and characterization studying of chromium(III), Molybdenum(II), nickel(II), palladium(II), and platinum(II) complexes with mixed bidentate ligands namely [3,5-dimethyl-1H-pyrazole-1-carnothioamide and 2,2-Bipyridine] which has been prepared by ring closure of acetylacetone with thiosemicarbazide, in acidified by 2-normality of hydrochloric acid. The new 2-pyrazoline based ligand was identified by mass spectra, NMR and FT-IR spectra. The optimization conditions of pH, time of reaction, and the molar ratio (M:L) were estimated in order to get the pure colored solid complexes chromium(III), molybdenum(II), nickel(II), palladium(II) and platinum(II) by the direct reactions of their metal chlorides in aqueous methanol with the ethanol solution of the ligand. The geometrical structures of the metal complexes were confirmed by measurements of electronic, IR spectra and the detection of magnetic susceptibility and molar conductivity measurements. The octahedral geometry for all complexes was suggested by the results obtained from elemental analyses and other spectral data except that palladium(II) complex which was square-planner in [PdL(bipy)]Cl2 formula.