Novos compostos supramoleculares de calixarenos com potenciais aplicações ionofóricas
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2020-12-18
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Universidade Federal de Goiás
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Calixarenes are macrocyclic organic molecules whose main characteristic is the host capacity and transport of ions and neutral molecules selectively. This work aims to synthesize new coordination compounds and supramolecular aggregates of calixarenes, thus providing new materials with potential application in analytical, environmental and technological chemistry. It is expected that the coordination pattern of self-organizing calixarenes to metal ions may present paramagnetic coupling properties different from the properties known so far. In addition, the objective is to elucidate these structures of acid and basic calixarenes, thus evaluating the formation of desired receptor-ligand complexes. In the preparation of six new crystalline samples, the solvents dimethylsulfoxide (DMSO) and dimethylformamide (DMF), the barium, copper and zinc metals salts, and the hexa(carboxymethoxy)calix[6]arene, tetra-p-fluoro-aminobenzylidene-tetrabutoxicalix[4]arene and tetra(carboxymethoxy)calix[4]arene. The compound hexa(carboxymethoxy)calix[6]arene 1 crystallized in the space group P with an entire macrocyclic molecule and five molecules of DMSO comprising the asymmetric unit, while the iminecalix[4]arene 2 was crystallized in the space group P21 with two molecules in the asymmetric unit using DMF as the solvent. Two dimers complexes of tetra-(carboxymethoxy)calix[4]arene were crystallized in DMSO in the space group P with Ba2+ 3, and in the space group P42bc with Cu2+ 4, which had paramagnetic properties. A new tetra(carboxymethoxy)calix[4]arene tetramer complex 5 was crystallized in the space group P with two distorted calix[4]tubes sharing two zinc ions. Another zinc hexameric supramolecular complex 6, formed by six tetra(carboxymethoxy)calix[4]arene ligands and 16 Zn2+, crystallized in the Ibam space group with coordination to a mixed inorganic core. The structure of 6 innovates research in supramolecular compounds and creates chemical inspiration in the search for complexes with a new structural center (core) inside the six calixarenes ligands. In conclusion, new coordination compounds of calix[4]areno-metal have been described, providing paramagnetic properties and new macromolecular platforms for coordination, opening new opportunities for the chemistry of calixarenes.
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SANTOS, F. M. Novos compostos supramoleculares de calixarenos com potenciais aplicações ionofóricas. 2020. 71 f. Tese (Doutorado em Química) - Universidade Federal de Goiás, Goiânia, 2020.