Synthesis and characterization of some unique heterocyclic derivatives containing aluminium atoms in four-and six-coordination states-I. Bis (acetylacetonato) aluminium(III)-di-μ-isopropoxo-glycolato aluminium

Abstract

Some mixed ligand complexes of aluminium of the type [(acac)₂Al(μ-OPrⁱ)₂ Al(O-G-O)]_n have been prepared by the reactions of [Al(OPrⁱ)₂(acac)]₂ and glycols (HO---G---OH) in 1:1 molar ratio in refluxing benzene (where acac = CH₃COCHCOCH₃; G = (CH₂)₂, CH₂CH(CH₃), C(CH₃)₂CH₂CH(CH₃), CH₂CH(C₂H₅)CH(C₂H₇), (CH₂)₄, (CH₂)₅, (CH₂)₆; n =1 or 2). These are soluble in common organic solvents and show tetranuclear behaviour in chloroform except [(acac)₂ Al(μ-OPrⁱ)₂Al{OC(CH₃CH₂CH(CH₃)O)], which is dinuclear. These derivatives have been characterized by elemental analysis, IR, ¹H, ¹³C and ²⁷Al NMR spectral studies. Two types of aluminium sites, tetrahedral and octahedral, are present in the ²⁷Al NMR spectra of all these novel heterocyclic derivatives.