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

doi:10.3390/ma3010503

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

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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

Yuki Mouri, Yoshitaka Sakai, Yoshitaka Kobayashi, Shoko Yoshida and Kenji Nomiya *

Department of Materials Science, Faculty of Science, Kanagawa University, Hiratsuka, Kanagawa 259-1293, Japan

* Author to whom correspondence should be addressed.

Received: 27 November 2009; in revised form: 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)]₂^6- (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

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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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