Síntese e elucidação estrutural de quatro novos polímeros de coordenação bidimensionais utilizando a isoniazida e o 4-sulfobenzoato como ligantes

Abstract

This dissertation reports the synthesis and structural characterization of four novel coordination polymers, obtained through the combination of divergent organic ligands with sulfonate, carboxylate, hydrazide, and pyridine functional groups, with three distinct metal cations. The synthesized compounds, {[Cu2(H2O)2(PBS)2(INH)2].6H2O}n, {[Er2K(H2O)3(PBS)2(INH)].5/2H2O}n, {[Nd(H2O)2(PBS)2(H-INH)].H2O}n and {[Nd2(H2O)7(PBS)3(INH)].3H2O}n, where PBS = 4-sulfobenzoate and INH = isoniazid, were chemically characterized by infrared spectroscopy, CHNS elemental analysis, and thermogravimetric analysis. Single crystals suitable for X ray diffraction were obtained via slow evaporation and slow cooling techniques, and both single-crystal and powder X ray diffraction analyses were employed to elucidate the crystal structures. Structural analysis revealed that all coordination polymers exhibit two-dimensional network architectures. Topological investigations demonstrated the formation of two novel network topologies for the Cu(II) and Er(III) compounds, and the gek1 and fes topologies for the Nd(III)-based frameworks, {[Nd(H2O)2(PBS)2(H-INH)].H2O}n and {[Nd2(H2O)7(PBS)3(INH)].3H2O}n, respectively. Furthermore, the study provided insights into the coordination behavior of the ligands toward distinct metal centers, highlighting variations in coordination number, mode, and geometry in each condition.