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Materials 2010, 3(1), 503-518; doi:10.3390/ma3010503

Transformation of Tri-Titanium(IV)-Substituted α-Keggin Polyoxometalate (POM) into Tetra-Titanium(IV)-Substituted POMs : Reaction Products of Titanium(IV) Sulfate with the Dimeric Keggin POM Precursor under Acidic Conditions

Department of Materials Science, Faculty of Science, Kanagawa University, Hiratsuka, Kanagawa 259-1293, Japan
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Received: 27 November 2009 / Revised: 8 January 2010 / Accepted: 13 January 2010 / Published: 15 January 2010
(This article belongs to the Special Issue Polyoxometalate Compounds)
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Abstract

Reaction products of titanium(IV) sulfate in HCl-acidic aqueous solution with the dimeric species linked through three intermolecular Ti-O-Ti bonds of the two tri-titanium(IV)-substituted α-Keggin polyoxometalate (POM) subunits are described. Two novel titanium(IV)-containing α-Keggin POMs were obtained under different conditions. One product was a dimeric species through two intermolecular Ti-O-Ti bonds of the two tetra-titanium(IV)-substituted α-Keggin POM subunits, i.e., [[{Ti(H2O)3}2(μ-O)](α-PW9Ti2O38)]26- (1). The other product was a monomeric α-Keggin species containing the tetra-titanium(IV) oxide cluster and two coordinated sulfate ions, i.e., [{Ti4(μ-O)3(SO4)2(H2O)8}(α-PW9O34)]3- (2). Molecular structures of 1 and 2 were also discussed based on host (lacunary site)-guest (titanium atom) chemistry. View Full-Text
Keywords: Keggin polyoxometalate (POM); titanium(IV)-substitution; Ti-O-Ti bonding dimer; host-guest chemistry; three host-four guest coordination; sulfate coordination Keggin polyoxometalate (POM); titanium(IV)-substitution; Ti-O-Ti bonding dimer; host-guest chemistry; three host-four guest coordination; sulfate coordination
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Mouri, Y.; Sakai, Y.; Kobayashi, Y.; Yoshida, S.; Nomiya, K. Transformation of Tri-Titanium(IV)-Substituted α-Keggin Polyoxometalate (POM) into Tetra-Titanium(IV)-Substituted POMs : Reaction Products of Titanium(IV) Sulfate with the Dimeric Keggin POM Precursor under Acidic Conditions. Materials 2010, 3, 503-518.

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