A series of Aluminum-diimine ligand complexes exhibiting multi-electron redox chemistry have been prepared. a-Diimine ligands of the type Ar-NC(Me)C(Me)N-Ar (Ar = substituted aromatic) were synthesized and their coordination chemistry to aluminum was investigated. Singly ((diimine1-)AlCl2) and doubly ((diimine2-)AlCl(THF)) reduced a-diimine complexes of aluminium were prepared for ligands incorporating substitution in the ortho positions of the aromatic side groups. Complexes were characterized by 1H NMR spectroscopy, X-ray diffraction, and DFT. The redox behaviour of the complexes were investigated using electrochemistry and the cyclic voltamograms showed rich redox behaviour. Aluminum complexes with a-diimine ligands lacking ortho substitution incorporated two ligands: The fully neutral ligand compounds ([(diimine)2AlCl2][AlCl4]) and the fully reduced ligand complexes M[(diimine2-)2Al] (M = alkali metal) were both prepared and characterized and the redox behavior was investigated.

Aluminum-a-diimine complexes: Redox-active aluminum systems

247th National Meeting (2014)

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