?Synthesis and characterization of cobalt complexes with ligands of natural origin?

Puerto Iguazú

Congreso; 6 th Latin American Symposium on Coordination and Organometallic Chemistry/6to Simposio Latinoamericano de Química de Coordinación, and Humboldt Kolleg: German-Latin American Symposium on Organometallic and Coordination Chemistry; 2017

6 th Latin American Symposium on Coordination and Organometallic Chemistry/6to Simposio Latinoamericano de Química de Coordinación, and Humboldt Kolleg: German-Latin American Symposium on Organometallic and Coordination Chemistry

The organometallic chemistry offers the possibility of synthesizing coordination compounds or complexes formed by organic molecules and metal centers1. The most widely used complexes come from noble metals with specific ligands. However, the synthesis of complexes with transition metals and sugars as ligands has allowed to obtain complexes with greater stability. Among the most used transition metals for the synthesis of these complexes are the iron (Fe), copper (Cu) and zinc (Zn) salts, among others2. Stable complexes3 have been synthesized with cyclodextrins that demonstrated catalytic activity4. The synthesis of complexes with the cyclodextrins (CD) and a second asymmetric type ligand was proposed, which, upon joining the metal salt center, have the capacity to improve both their catalytic activity and their stability.The complexes were characterized through techniques such as IR, TGA, Abs. Atomic, titration of halogens and UV-Vis RD. With the integration of these techniques it was possible to determine stoichiometries, in some cases it was possible to propose structures.The complexes between -CD, CoBr2 and a second asymmetric ligand are stable against moisture, modifications are observed in the formation of hydrogen bridges of CD. In addition, with UV.Vis spectroscopy RD, energies corresponding to octahedral splits characteristic of cobalt were determined.