Synthesis, Solution and Solid State Structure of Titanium-Maltol Complex.

Inorganica Chimica Acta
José LamboyEnrique Meléndez

Abstract

The reaction of Cp(2)TiCl(2) with two equivalents of maltol (3-hydroxy-2-methyl-4-pyrone) in water, at room temperature and pH of 5.4, leads to a complete replacement of Cp and chloride ligands affording, Ti(maltolato)(2)(OH)(2.) The complex has been characterized by IR, NMR and ESI-MS spectroscopic and cyclic voltammetry methods. In DMSO-d(6) solution, the complex shows two isomers in a ratio of 4:1, in which one OH signal can be identified per isomer. This suggests that in solution the complex is monomeric, most likely a chiral cis-Ti(maltolato)(2)(OH)(2) and trans-Ti(maltolato)(2)(OH)(2). The monomeric nature of the complex (in water/methanol 1:1) was verified by ESI-MS spectroscopy, showing a parent peak at 329 m/z. Electrochemical behavior of Ti(maltolato)(2)(OH)(2) using cyclic voltammetry experiments showed the complex undergoes irreversible reduction in aprotic solvents. In D(2)O solution, at pH of 8.4, the (1)H NMR spectrum of the complex shows a mixture of monomer and tetramer Ti(IV)-maltol complexes in a ratio of 1:1. The crystallization of Ti(maltolato)(2)(OH)(2) at pH of 8.4 leads to the formation of [Ti(4)(maltolato)(8)(μ-O(4))]•18H(2)O. A single crystal of [Ti(4)(maltolato)(8)(μ-O(4))]•18H(2)O was analyzed by X-r...Continue Reading

Citations

Nov 15, 2011·Chemical Reviews·Katherine M Buettner, Ann M Valentine
Jun 15, 2007·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Li Ming GaoEnrique Meléndez
Feb 22, 2008·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Ramón HernándezEnrique Meléndez
Nov 5, 2011·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Lei LiShu-Yun Niu
Oct 12, 2010·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Beatriz S Parajón-Costa, Enrique J Baran
Sep 24, 2009·Toxicology in Vitro : an International Journal Published in Association with BIBRA·Ramón HernándezEnrique Meléndez

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