Síntese, caracterização e estrutura cristalina de redes metalorgânicas com ligantes mistos N- e O- doadores

Abstract

The aim of this work was the synthesis of MOFs with mixed ligands N- and O- donors from some metal cations of first series transition, as connectors of the net. In this work has been obtained coordination networks CoPDC2D and ZnPDC2D, that are iso-structures, which extend two-dimensionally forming loops with 16-shortest circuits, including the ligand 2,5-pyridinedicarboxylate 2,5-pdc and the Co2+ and Zn2+ cations, respectively. Both structures were recently published, however there some differences between the syntheses and the yield. Moreover, this work reports briefly the topological study of these two-dimensional networks. Additionally, were obtained a new coordination network ZnPDC1D, including loops formation, which extend one-dimensionally containing the cation Zn2+ and 2,5-pdc ligand. Here, were reported a series of new complexes CuPDC0D, MnPDC0D, CuPDC0Dq and CuPDC0Dr, anionic, including just the 2-5-pdc ligand and some this having Cu2+ e Mn2+ ions. This systems are monomers MnPDC0D and CuPDC0Dr or oxometalates dimmers CuPDC0D and CuPDC0Dq, including etilenodiamine on the crystalline network and, in some cases, participating on coordination CoPDC0Dq. Finally, are discussed about the nitrogenous ligands 1,2-bis(2-pyridil)etilenediamine 2-bpen and 1,2-bis(4-pyridil)etilenediamine 4-bpen, that were synthesized and characterized but not was observed the coordination in any system here reported. This has been attributed to the hydrolysis of nitrogenous ligands and, therefore, was proposed a mechanism for hydrolysis of these systems. The crystal structure of ligand 2-bpen, not yet reported in literature, was discussed.