Synthesis and characterization of some mixed ligand heterocyclic compounds of aluminium(III) containing acetylacetone and glycol moieties

Abstract

The reaction of [Al(CH₃COCHCOCH₃)₂(Opr-i)]₂ with glycols (HO-G-OH) in 1:2 molar ratio in refluxing benzene yields H[(CH₃COCHCOCH₃)₂Al(O-G-O)][where G=G¹=-C(CH₃)₂CH₂CH(CH₃)- or G²=-C(CH₃)₂C(CH₃)₂-]. These derivatives are soluble in benzene, chloroform and dimethyl sulfoxide and are monomeric in chloroform. Further reaction of H[(CH₃COCHCOCH₃)₂Al(O-G-O)Al(O-G-O) with alkali metal methoxide (MOCH₃) in 1:1 molar ratio in methanol yields the bimetallic heterocyclic derivatives of the type [(CH₃OH)M] [(CH₃COCHCOCH₃)₂] Al(O-G-O) (where M = Li, Na and K). Also these are soluble in methanol and dimethyl sulfoxide and are monomeric. These complexes show slight ionic character in 0.001M methanol solution. All derivatives have been characterized by elemental analyses, IR, ¹H, ¹³C and ²⁷Al NMR spectral studies. The ²⁷Al NMR spectra show the presence of octahedrally coordinated aluminium atoms.