COORDINATION COMPLEXES OF METAL ALKOXIDES: PART II. METAL ALKOXIDE – ETHYLENEDIAMINE COMPLEXES

Abstract

Some complexes of titanium isopropoxide, titanium ethoxide, aluminum isopropoxide, tantalum isopropoxide, and zirconium isopropoxide with ethylenediamine (en) are described. Two complexes of titanium isopropoxide with ethylenediamine, i.e. Ti(OPr i ) 4 ,en and Ti 2 (OPr i ) 8 ,en, were established by cryoscopic, X-ray powder photograph, and phase rule studies. The structure and stability of these complexes is discussed. Also isolated were Ti 2 (OEt) 8 ,en; Zr 2 (OPr i ) 8 ,en; Ta 2 (OPr i ) 10 ,en, and Al 2 (OPr i ) 6 ,en. Cryoscopic studies on the aluminum complex suggested that an octameric complex, Al 8 (OPr i ) 24 , (en) 4 , is present in equilibrium with the dimer. The structural implications of the existence of these complexes are discussed.Phase studies on the binary systems containing titanium tetraisopropoxide and pyridine, diethylamine, or tert-butyl acetate gave no clear indication of complex formation.