Titanium-based mixed oxides from a series of titanium(IV) citrate complexes

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.08.033· OSTI ID:21043738

Yuanfu, Deng ^[1]; Hualin, Zhang; Qiming, Hong; Weizheng, Weng; Huilin, Wan ^[1]

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1. Department of Chemistry and State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005 (China)

The isostructural hexaaquatransition-metal/titanium citrate complexes (NH{sub 4}){sub 2}[M(H{sub 2}O){sub 6}][Ti(H{sub 2}cit){sub 3}]{sub 2}.6H{sub 2}O [M(II)=Mn 1, Fe 2, Co 3, Ni 4, Cu 5, and Zn 6] (H{sub 4}cit=citric acid), which were synthesized by reacting titanium(IV) citrate with divalent metal salts in the 1.0-3.5 pH range, adopt hydrogen-bonded chain motifs. The crystal structures feature three bidentate citrate anions that chelate to the titanium atom through their negatively charged {alpha}-alkoxy and {alpha}-carboxy oxygen atoms; the chelation is consistent with the large downfield shifts of {sup 13}C NMR for carbon atoms for complex 6. The thermal decomposition of the complexes furnishes mixed metal oxides. The main-group magnesium analog when heated at 600 deg. C yielded MgTi{sub 2}O{sub 5} that is of the pseudobrookite type; the particle size is approximately 30 nm. - Graphical abstract: A series of heterobimetallic titanium citrate complexes with novel dodecameric water clusters were isolated and used as molecular precursors in an attempt to the preparations of mixed oxides MTi{sub 2}O{sub 5}.

• OSTI ID: 21043738
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CHELATES
CITRATES
COBALT COMPLEXES
COBALT OXIDES
COPPER COMPLEXES
COPPER OXIDES
CRYSTAL STRUCTURE
IRIDIUM COMPLEXES
IRON OXIDES
NICKEL COMPLEXES
NICKEL OXIDES
NUCLEAR MAGNETIC RESONANCE
PYROLYSIS
TEMPERATURE RANGE 0400-1000 K
TITANIUM COMPLEXES
TITANIUM OXIDES
ZINC COMPLEXES
ZINC OXIDES