Synthesis and characterization of mesitylgallium chloride compounds including the crystal and molecular structure of dichloromesitylgallium(III), an inorganic polymer

Abstract

Abstract : The mesitylgallium chloride compounds, GaMes2Cl and GaMesCl2, have been prepared and fully characterized by melting point data, elemental analyses, solubility properties, IR and Hydrogen 1 and Carbon 13 NMR spectroscopic data and Lewis acidity studies. Cryoscopic molecular weight studies of GaMes2Cl in benzene solution are consistent with the presence of dimeric molecules. Lewis bases such as Ethylene Oxide and Tetrahydrofuran (THF) react with (GaMes2Cl)2 in benzene to establish two equilibria which are consistent with the presence of the dimer, a monochloride bridged 2:1 adduct ((GaMes2Cl)2-base) and the 1:1 adduct. The dichloro derivative GaMesCl2 is an unusually high melting solid which is insoluble in hydrocarbon solvents and crystallizes in the centrosymmetric monoclinic space group. Dichloromesitylgallium(III) is a one-dimensional polymer in which planar Ga(mesityl)Cl units are linked by bridging chloride ligands.