Crystal Research and Technology
Cryst. Res. Technol. 43, 214 (2008) - Abstract -

Synthesis and characterization of tetraprolinium silicotungstic acid tetra-hydrate, a new organic-inorganic hybrid based on polyoxometallates

M. H. Alizadeh, R. Tayebee*, and M. Mirzaei

Department of Chemistry, Ferdowsi University, Mashhad, P. O. Box 91779-1436, Iran
*Department of Chemistry, Sabzevar Teacher Training University, Sabzevar, P. O. Box 397, Iran

Keywords polyoxometallate, amino acid, L-proline, hydrogen bonding, organic-inorganic compound
PACS 61.66.Hq
DOI 10.1002/crat.200710963

A new solvated polyoxometallate bearing an amino acid, (I), has been prepared for the first time by the reaction of 0.16 mmol á-H4SiW12O40.15H2O with 0.78 mmol of L-proline in hydrochloric acid at pH 3. The structure of (I) was substantially characterized by some physical approaches, such as elemental analysis, infrared spectroscopy, and 1H-NMR. Our findings proved that (I) could be formulated as [L-C5H10NO2]4[SiW12O40].4H2O. It is believed that the electrostatic attractions and hydrogen bonding between tungstosilisic acid and the prolinium cation affected the structure of (I). It is evident that the polyoxometallates moieties were arranged in good order to form large holes in the structural backbone. These cavities were occupied by the prolinium cations and water molecules.




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