A series of a-diimine ligands of the type Ar-NC(Me)C(Me)N-Ar (Ar = 2,6-diisopropylphenyl (1  ), Ar = 2,4,6-trimethylphenyl (2  ), and Ar = 3,5-bistrifluoromethylphenyl (3  )) were prepared on multi-gram scale in 59-98% yield. Ligands were characterized by 1H NMR spectroscopy. The redox behavior of the ligands was investigated using electrochemistry.The coordination chemistry of ligand 1  to aluminum was investigated across the three available oxidation states of the ligand. Reaction of neutral ligand with aluminum trichloride affords the coordination complex (diimine)AlCl3 (Al-I  ). Reaction of the singly reduced and doubly reduced a-diimine ligand with AlCl3 affords the analogous (diimine-1)AlCl2 (Al-II  ) and (diimine-2)AlCl (Al-III  ) complexes, respectively. The complexes were characterized by X-ray diffraction. The redox behavior of the complexes was investigated using electrochemistry.

Synthesis of a series of aluminum a-diimine complexes: Progress toward redox-active aluminum systems

244th National Meeting (2012)

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