Study On The Synthesis And Property Of The New Coordination Comlexes Dealing With Nitrogenous Aromatic Ring Heterocycle Compounds As Ligands

In this dissertation five novel coordination complexes have been designed and synthesized dealing with the 2-(3,5-dimethyl-1H-pyrazol-1-yl)-1,10-phe- nanthroline (L) as ligands and the five complexes include the mononuclear manganese(II) complex [Mn(L)(NCS)₂] (1);the mononuclear copper(II) complex [Cu(L)(L₁)Br](ClO₄)(H₂O) (2) (L₁=3,5-dimethyl-1H-pyrazol-1-yl) and the three mononuclear cadmium(II) complexes, namely, [Cd(L)(NCS)₂] (3), [Cd(L)Cl₂] (4) and [Cd(L)(O₂N)Cl] (5).The five complexes were characterized by infrared spectra and their crystal structures determined by X-ray crystallographic analysis. The study on the correlation between the structures of ligands and the coordination characters has been made and some correlation factors has been obtained. The varied-temperature magnetic susceptibilities were measured on complex (1) in the 2-300 K temperature range and the fitting with formula of a binuclear Manganese(II) has been processed based on the data of the susceptibilities and some correlation factors between theÏ€-Ï€stacking and the magnetic coupling have been obtained, which indicates that theÏ€-Ï€stacking resulted in a weak anti-ferromagnetic interaction between the neighbor mangase(II) ions. The obtained results will benefit the understanding of magnetic coupling mechanism forÏ€-Ï€stacking and the preparation for ideal molecular magnets. The obtained results also will play an important role in understanding of coordination characters and structure specialties for complexes with the derivatives of 1,10-phenanthroline as ligands.