A NEW CLASS OF ALUMINUM CATIONS BASED UPON TETRADENTATE (N2O2) CHELATING LIGANDS

Herein are described the synthesis and characterization of the complex es of formula LAlR (where R = Cl and L = Salen (1), SalenCl (2), Acen (3) and where R = Me and L = Salen (4), SalenCl (5), Acen (6); Salen = N,N'-ethylenebis((2-hydroxyphenyl)methylimine, SalenCl = thylenebis(( 2-hydroxy-5-chlorophenyl)methylimine), Acen = N,N'-ethylenebis((2-hydr oxyphenyl)-1-ethylimine)). The LAlCl derivatives dissolve in water and MeOH to yield the cationic complexes [LAl(H2O)(2)]Cl-+(-) (L = Salen (7), SalenCl (8), Acen (9)) and [LAl(MeOH)(2)Cl-+(-) (L = Salen (10), SalenCl (11), Acen (12)), respectively. An alternative preparation of the cationic species involves the reaction of the LAlCl derivative wit h NaBPh(4). This leads to complexes of formula [LAl(MeOH)(2)](+)BPh(4) (-) (L = Salen (13), SalenCl (14), Acen (15)). Complexes 4-6 can be re acted with either MeOH or 4-chloro-3,5-dimethylphenol (Ph') to form co mplexes of general formula LAlOR (R = Me, L = Salen (16), SalenCl (17) , Acen (18); R = Ph', L = Salen (19), SalenCl (20), Acen (21)). All of the compounds were characterized by IR, melting points, elemental ana lyses, and, when soluble, NMR. Additionally, the crystal structures of 7, 13, 15, and 18 were obtained.