Synthesis and characterization of some unique heterocyclic derivatives containing aluminium(III) atoms in different co-ordination states. I. Reactions of bis(β-diketonato)-aluminium(III)-di-μ-isopropoxo-di-isopropoxoaluminium(III) with 2-pyridylmethanol

Abstract

Reactions of bis(β-diketonato)aluminium(III)-di-μ-isopropoxo-di-isopropoxoaluminium(III), [(CH₃COCHCOR)₂Al-(μ-OPr-i)₂Al(OPr-i)₂] with 2-pyridylmethanol, (C₅H₄N-2-CH₂OH) in 1:1 and 1:2 molar ratios in refluxing anhydrous benzene resulted in the synthesis of [(CH₃COCHCOR)₂Al (μ-OPr-i)₂Al(OCH₂-2-C₅H₄N)(OPr-i)] [where R=CH₃ (1), -OC₂-H₅ (3), and -C₆H₅ (5)] and [(CH₃COCHCOR)₂Al (μ-OPr-i)₂Al (OCH₂-2-C₅H₄N)₂] [where R=CH₃ (2), -OC₂H₅ (4), and -C₆H₅ (6)], respectively. All of these compounds are sharp melting solids and are soluble in a variety of organic solvents (e.g., benzene, chloroform and dimethyl sulfoxide) except [(CH₃COCHCOOC₂H₅)₂Al(μ-OPr-i)₂ Al(OCH₂-2-C₅H₄N)₂], which is insoluble in benzene but soluble in chloroform and dimethylsulfoxide. All of these derivatives show a dinuclear structure in benzene. All of the above derivatives have been characterized by elemental analyses, molecular weight determinations, IR and NMR (¹H, ¹³C and ²⁷Al) and FAB mass spectral studies.