Síntese e caracterização do metano-sulfonato de índio(III) tri-hidratado.

Abstract

Indium(lIl) methanesulfonate, as a compound of the type In(CH3SO3)3.xH2O has been prepared by reaction of indium hydroxide with the methanesulfonic acid in aqueous solution. The white solid compound is higroscopic, non-electrolyte, soluble in water and insoluble in organic solvents. The compound has been characterized by analytical determination of indium, infrared absorption spectra, thermogravimetric analysis and x-ray Difraction. Infrared spectrum(4000-400 cm-1) have been recorded using KBr pellets. The splittings and shifts observed in vibrations νas(SO2) and δas(SO2) attributed to the methanesulphonate anion are interpreted in terms of a lowering of its C3v simmetry to C, and that the methanesulphonate anion is coordinated (monodentade) to the tripositive indium. The bands νas(OH) and νs(OH) are relative the lattice water. The band in 541 cm-1 suggests the presence of coordination water. The thermogravimetric curves have been obtained in air atmosphere at heating rates of 10 and 150°C/min and nitrogen atmosphere at 10°C/min.The decomposition in air occured in two steps while in nitrogen, occured in three steps. The curves showed that the x-ray difratogram by powder method indicated the presence of a crystalline compound.