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

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

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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.
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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

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(1):503-518.

Chicago/Turabian Style

Mouri, Yuki; Sakai, Yoshitaka; Kobayashi, Yoshitaka; Yoshida, Shoko; Nomiya, Kenji. 2010. "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 3, no. 1: 503-518.


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