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

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