Synthesis and characterization of some unique heterocyclic derivatives containing aluminium (III) atoms in different coordination states--4. Reaction of bis (β- diketonato) aluminium(III)-di-μ-isopropoxo-di-isopropoxo aluminium(III) with 8-hydroxyquinoline

Abstract

Reactions of bis(β-diketonato)aluminium(III)-di-μ-isoproxo-di-isopropoxo aluminium(III), [(CH₃COCHCOR)₂Al(μ-OPrⁱ)₂Al(OPrⁱ )₂] with 8-hydroxyquinoline, C₉H₆NOH in 1:1 and 1:2 molar ratios, have resulted in the synthesis of [(CH₃COCHCOR)₂Al(μ-OPrⁱ)₂Al(ONC₉ H₆)(OPrⁱ)] and [(CH₃COCHCOR)₂Al(μ-OPrⁱ)₂Al(ONC₉ H₆)₂], respectively. These are soluble in a variety of organic solvents (e.g. benzene, chloroform and dimethylsulfoxide), except [(CH₃COCHCOCH₃)₂Al(μ-OPrⁱ)₂ Al(ONC₉H₆)₂] and [(CH₃COCHCOOC₂H₅)₂Al(μ-OPrⁱ)₂Al(ONC₉H₆)₂], which are insoluble in benzene but soluble in chloroform and dimethylsulfoxide. These derivatives show dinuclear behaviour in chloroform. Plausible structures have been proposed on the basis of elemental analyses, molecular weight measurements, IR and NMR (¹H, ¹³C and ²⁷Al) spectral studies. ²⁷Al NMR spectra show the presence of six and four/five coordinated aluminium sites.