Reactions of ‘GaI’ with organometallic transition metal halides
摘要:
Two approaches towards the synthesis of phosphine ligated half-sandwich complexes [(eta(x)-CxHx)M(PR3)(2)GaI2](n) containing diiodogallyl ligands have been investigated. Insertion. of 'Gal' into the Mo - I bond of (eta(7)-C7H7)Mo(CO)(2)I has been shown to yield the crystallographically characterized dimeric complex [(eta(7)-C7H7)Mo(CO)(2)GaI2](2) (2). Attempts to substitute the carbonyl ligands by the phosphine ligand dppe [dppe = bis(diphenylphosphino)ethane] have been shown instead to yield the sparingly soluble complex [(eta(7)-C7H7)Mo(CO)(2)GaI2](2)(mu-dppe) (3) in which the phosphine bridges two [(eta(7)-C7H7)Mo(CO)(2)GaI2] units via a pair of P -> Ga donor/acceptor bonds. By contrast, attempts to insert 'Gal' directly into the metal-halogen bond of phosphine ligated complexes such as (eta(5)-C5H5)Ru(PPh3)(2)Cl or (eta(5)-C5H5)Ru(dppe)Cl have been shown to result in the formation of the tetraiodogallate species (eta(5)-C5H5)Ru(PPh3)(2)(mu-I)GaI3 (5) and [(eta(5)-C5H5)Ru(dppe)](+)[GaI4](-) (7). (c) 2007 Elsevier B.V. All rights reserved.