| Abstrakt: |
A potentially tridentate ligand, Phensal(tBu)H3, was prepared by the condensation of 1 equiv of phenylenediamine with 3,5-di-tert-butylsalicylaldehyde. When 1 equiv of this new ligand is added to AlMe3, [[Phensal(tBu)HAlMe]]2 (1) results. In contrast, this reaction with GaMe3 produces [Phensal(tBu)H2]GaMe2 (2). When 1 or 2 equiv of Phensal(tBu)H3 is combined with Et2AlCl, the complex [Phensal(tBu)]2AlCl (3) forms. However the same reaction with Me2GaCl leads to [Phensal(tBu)H2]Ga(Me)Cl (4). A cationic complex, {[Phensal(tBu)]2Al}+Cl- (5), is formed when 3 is dissolved in MeOH. The MeOH apparently mediates the formation of the cation but does not coordinate the cationic metal. When the solvent is removed, 5 reverts back to neutral 3. When 3 is combined with GaCl3 in toluene, another cationic complex, {[Phensal(tBu)H2]2Al}+GaCl4- (6), is formed. In a similar manner, {[Phensal(tBu)H2]2Al}+Me2AlCl2- (7) is formed by adding Me2AlCl to 3. The compounds were characterized by mp, elemental analyses, IR, 1H and 27Al NMR, and in the case of 2, 5, and 6 single-crystal X-ray analysis. |
