Polimorfismo nos complexos de trietanolamina dos metais do quarto período
2012; Linguagem: Inglês
ISSN
2639-6459
Autores Tópico(s)Inorganic and Organometallic Chemistry
ResumoDue to contradictions in the literature as to the nature of the complexes of metals of the fourth period of the periodic table with the ligand tris(2hydroxyethyl) amine (triethanolamine) (TEAH3), a reinvestigation was made consisting in exploring the possibilities of the ligand to form dimers or even polymers with the property of polymorphism with salts of transition metals Co and Cu. With the metal representative Zn, the compounds did not show the property to crystallize in more than one different crystal structure. The complexs [MCl(TEAH2)] were prepared from mixtures of solution of MCl2 and TEAH3 in various proportions, and the products were characterized by infrared spectroscopy and X-ray diffraction (powder and single crystal). During attempts to obtain crystals of the complexes [MCl(TEAH2)] (M = Co, Cu, Zn) in isoamyl alcohol, was observed unusual oxidation of TEAH2 coordinated that yield derivatives of formula [M(bic)2] (M = Co, Cu, Zn). The determination of crystal and molecular structure of the single crystal of [Cu(bic)2] obtained was carried out by Professor. Dr. Carlos B. Pinheiro, Universidade Federal de Minas Gerais (UFMG).
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