AKIS-(3,5-DIMETHYL-1-PYRAZOLYL)CYCLOTRIPHOSPHAZENE AS CARRIER FOR HETEROBIMETALLIC COMPOUNDS

Mononuclear and heterodinuclear complexes of the title ligand, L, with Cu(II), Ni(II), Co(II) and Pd(II) have been synthesised and character ised with the aid of elemental analyses, conductivity and magnetic sus ceptibility measurements, IR and W-Vis spectroscopy. The ligand L acts as a tridentate in all mononuclear complexes. The amido nitrogen (P-N IF) of the spirocyclic ring, pyrazolyl pyridinic nitrogen and cyclotri phosphazene ring nitrogen are involved in coordination. This ligand be haves as a pentadentate in the dinuclear complexes where additional co ordination is achieved by the two geminal pyrazolyl pyridinic nitrogen s at the 3rd phosphorus atom of the phosphazene ring. All mononuclear complexes with Cu(II), Ni(II), Co(II) form trigonal bipyramidal coordi nation. In the heterodinuclear complexes the palladium prefers square- planar geometry.