GROUP-13 ORGANOMETALLIC CHALCOGEN DERIVATIVES - THEIR STRUCTURES AND BEHAVIOR IN SOLUTION

The syntheses, structures and equilibria which occur for 13-16 organom etallic compounds are reviewed. The organoaluminum thiolates form dime rs, trimers, and tetramers with central (AlS)(2), (AlS)(3), and (AlS)( 4) rings in the solid state. The structures of the gallium and indium thio:lates are dominated by dimers, but a tetramer has been observed f or gallium and a trimer for indium. Only dimeric derivatives have been reported for the selenium and tellurium derivatives. In hydrocarbon s olutions, the aluminium thiolates establish equilibria between differe nt aggregates and conformations with dimers and trimers most common. I n the dimeric derivatives, [Me(2)Al(mu-SMe)](2) and [Me(2)Al(mu-SeMe)] (2), syn and anti conformations are observed in solution at low temper ature by NMR spectroscopy. In the trimeric derivatives, the chair conf ormation is observed in the solid state. In solution, a chair to chair inversion occurs with the rate dependent on the substituents bound to the sulfur.