Indium complexes of 1,3-diphenyltriazene
Abstract
The reaction of InCl3 with 1,3-diphenyltriazene (Hdpt) in the presences of NEt3 gives the six-co-ordinate indium complex [NHEt3][InCl2(dpt)2]1a. The interaction of 1a with [NEt4]Cl and [N(PPh3)2]Cl allows for the isolation of the appropriate salts, [NEt4][InCl2(dpt)2]1b and [N(PPh3)2][InCl2(dpt)2]1c. Reaction of Lewis bases, L, with 1a yields [InCl2(dpt)L2], L = pyridine 2, 3,5-dimethylpyridine 3, PEt34, L2= 2,2′-bipyridine 5, 1,10-phenanthroline 6, Me2PCH2CH2PMe27 or Et2PCH2CH2PEt28. The mechanism for these reactions is discussed. No reaction is observed between 1b and 3,5-dimethylpyridine. The X-ray structures of 1a, 3, 4 and 5 have been determined. Compounds 2–4 are readily soluble in aromatic hydrocarbon solvents, while 5–8 are insoluble as a consequence of the presence of a supramolecular architecture involving dipolar In–Cl ⋯ N interactions in the solid state. All new compounds have been characterised by 1H, 13C-{1H} and 31P-{1H} NMR and IR spectroscopy.