Síntese e caracterização estrutural de novos compostos organocalcogenoxanos contendo ítrio(III)

Abstract

This work describes the synthesis and structural characterization of new organochalcogenoxanes polymer and clusters compounds containing yttrium(III) ion. The synthetized compounds have structure of unidimensional coordination polymer [Y(C6H5SeO2)2(NO3)(CH3OH)]n (1) which grows along crystallographic axis a and macromolecular clusters [(C6H5Te)18O24{Y(NO3)(H2O)}216+] (2), [{(C6H5Te)18O24Y(NO3)(H2O)(C6H5SeO2)2}212+] (3) and [{(C6H5Te)18O24Y(NO3)(H2O)(C6H5SeO2)3}210+] (4). There is a lack of study of compounds containing organocalcogenoxanes (R-E-O, where R = aryl, E = Se, Te) and its known that they compose a great variety of compounds of interesting morphologies. So, knowing that yttrium(III) ion is one of the hardest species according to Pearson’s Theory, this property was utilized to synthetize compounds where this ion coordinates to oxygen, the hard atom of organocalcogenoxanes ligands. From the reaction of phenylseleninic acid with yttrium(III) salt, a coordination polymer was synthetized (1) and the versatility of coordination modes of this ligand can be observed. In the synthesis of compounds 2, 3 and 4, phenyltellurium(IV) triiodide was utilized, which doesn’t contain any oxygen originally, but suffer an in situ hydrolysis reaction producing phenyltellurinic acid. Due to the hypervalent character of the tellurium atom, half-spheres were formed interconnected by iodine rings in (2) or phenylseleninate bridges in (3) and (4). Yttrium(III) plays an important role in the formation of this clusters because it acts as a template, confirmed due the attempt to perform the same reaction without the presence of this ion, and the impossibility to get the same compounds. The compounds were characterized by X-ray diffraction, infrared spectroscopy, elemental analysis and mass spectrometry.