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Compounds formed by the tritertiary arsine ligand methylbis(3-dimethyl- arsinylpropyl)arsine (tas) with titanium tetrahalides (where the halide is F, Cl, Br, or I) and zirconium tetrabromide are described. Titanium and zirconium tetrabromide yield isomorphous crystals of the neutral diamagnetic complexes (MBr4 tas), which are believed to be seven- coordinate, The complexes [(TiF4)3 tas], [(TiCl4)2 tas], and [TiI3 tas]I have been isolated and their physical properties and possible structures are discussed.

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