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1743774 
Journal Article 
Transformation of Tri-Titanium(IV)-Substituted alpha-Keggin Polyoxometalate (POM) into Tetra-Titanium(IV)-Substituted POMs: Reaction Products of Titanium(IV) Sulfate with the Dimeric Keggin POM Precursor under Acidic Conditions 
Mouri, Y; Sakai, Y; Kobayashi, Y; Yoshida, S; Nomiya, K 
2010 
1 
Materials
ISSN: 1996-1944 
3 
1 
503-518 
WOS:000298240100028 
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 trititanium(IV)-substituted alpha-Keggin polyoxometalate (POM) subunits are described. Two novel titanium(IV)-containing alpha-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 alpha-Keggin POM subunits, i.e., [[{Ti(H(2)O)(3)}(2)(mu-O)](alpha-PW(9)Ti(2)O(38))](2)(6-) (1). The other product was a monomeric alpha-Keggin species containing the tetra-titanium(IV) oxide cluster and two coordinated sulfate ions, i.e., [{Ti(4)(mu O)(3)(SO(4))(2)(H(2)O)(8)}(alpha-PW(9)O(34))](3-) (2). Molecular structures of 1 and 2 were also discussed based on host (lacunary site)-guest (titanium atom) chemistry. 
Keggin polyoxometalate (POM); titanium(IV)-substitution; Ti-O-Ti bonding dimer; host-guest chemistry; three host-four guest coordination; sulfate coordination