Bimetallic aluminum and gallium chelates with N2O2 ligands

A wide range of bimetallic aluminum molecules are formed in combinations be tween Salen Schiff base ligands and either AlR3 or AlR2Cl. They are of the general formulas L(AlR2)(2) and L(AlRCl)(2) with R = alkyl and L = Salen(Bu -t) ligand with relatively unusual "backbone" connections between the nitro gen atoms, 1,2-cyclohexylene (Salcen(Bu-t)), 1,4-butylene (Salben(Bu-t)), 1 ,5-pentylene (Salpten(Bu-t)), 1,6-hexylene (Salhen(Bu-t)), and 1,4-phenylen e (1,4-Salophen(Bu-t)). Additionally, previously unknown ligands were emplo yed with the "backbones" 1,4-bis(p-aminobenzyl)benzene (Salmaben(Bu-t)), 1- (m-aminobenzoyl)-4-(m-aminobenzyl)benzene (Salmabmaben(Bu-t)), and 4,4'-bis (m-aminobenzoyl)diphenylmethane (Salmadmen(Bu-t)). The ligands for these co mpounds were designed to feature two group 13 sites at long and varying dis tances from one another. The compounds were characterized by mp analyses, I F, and H-1 NMR, and X-ray structures were determined for the examples R,R'- Salcen(Bu-t){AlMe2}(2) (1), Salben(Bu-t){AlMe2}(2) (2), 1,4-Salophen(Bu-t){ GaEt2}(2) (7), R,R'-Salcen(Bu-t){AlMe2}(2) (11), Salben(Bu-t){AlMeCl}(2) (1 3), and Salhen(Bu-t){AlMeCl}(2) (14).