Pure ti-based mixed oxides prepared from the thermal decompositions of molecular precursors of peroxo complexes coordinated with tris(hydroxycarbonylmethyl)amine trivalent anion titanate(IV)
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Date
2004Author
ZHOU, Zhao-Hui
周朝晖
HONG, Qi-Ming
洪麒明
DENG, Yuan-Fu
邓远富
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- 化学化工-已发表论文 [14469]
Abstract
Different peroxo titanate (IV) complexes coordinated with tris(hydroxycarbonylmethyl) amine trivalent anion including ammonium, potassium, strontium and barium salts (NH4)(4)[Ti2O(O-2)(2)(ta)(2)]-4H(2)0 (1), K-4[Ti2O(O-2)(2)(ta)(2)]-6H(2)O (2), Sr-2[Ti2O(O-2)(2)(ta)(2)]-10H(2)O (3) and Ba-2[Ti2O(O-2)(2)(ta)(2)]-10H(2)O(4) were obtained directly from the triad system of TiCl4-H2O2-H(3)ta [H(3)ta = tris(hydroxycarbonylmethyl) amine] in pH 2.5 similar to 4.0. These complexes were characterized with elemental analysis, UV-vis and IR spectra. X-ray structural analysis shows that all complexes contain a similar dimeric anion structure, in which titanium atom is coordinated heptagonally by a peroxo group, a tetradenatate tris(hydroxycarbonylmethyl)amine trivalent anion ligand and a bridging oxygen atom. The cation Sr2+ and Ba2+ are coordinated enneahedrally and decagonally by water molecules and carboxyl groups of tris-(hydroxycarbonylmethyl)amine trivalent anion ligand respectively. The ammonium, strontium and barium salts can be decomposed stoichiometrically into the expected low-temperature phases of rutile TiO2, SrTiO3 and tetragonal BaTiO3 at the temperature of 600 degreesC respectively, which has been confirmed by XRD characterization.