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Title: Three new inorganic-organic hybrid materials based on inorganic cluster, [(PO<sub>4</sub>)M<sub>12</sub>O<sub>36</sub>].nH<sub>2</sub>O (M = Mo, W)
Authors: Yousefi, Mohammad
Eshtiagh-Hosseini, Hossein
Mirzaei, Masoud
Salimi, Ali R.
Nikpour, Mohsen
Keywords: Polyoxometalates
Inorganic-organic hybrids
Amino acids
Methyl urea
Issue Date: Jan-2011
Publisher: NISCAIR-CSIR, India
Abstract: Three new inorganic-organic hybrid materials based on heteropolyoxometalates, [L-C<sub>6</sub>H<sub>14</sub>NO<sub>2</sub>]<sub>3</sub>[(PO<sub>4</sub>)Mo<sub>12</sub>O<sub>36</sub>].3H<sub>2</sub>O (<b>1</b>), [L-C<sub>5</sub>H<sub>10</sub>NO<sub>2</sub>]<sub>3</sub>[(PO<sub>4</sub>)W<sub>12</sub>O<sub>36</sub>].H<sub>2</sub>O (<b>2</b>), and [C<sub>2</sub>H<sub>7</sub>N<sub>2</sub>O]<sub>3</sub>[(PO<sub>4</sub>)W<sub>12</sub>O<sub>36</sub>].4H<sub>2</sub>O (<b>3</b>), where C<sub>6</sub>H<sub>14</sub>NO<sub>2</sub>, C<sub>5</sub>H<sub>10</sub>NO<sub>2</sub>, and C<sub>2</sub>H<sub>7</sub>N<sub>2</sub>O are protonated l-leucine, l-proline, and methyl urea, respectively, have been synthesized and structurally characterized by some physico-chemical methods. Elemental analyses, IR, Raman, mass, UV, and <sup>1</sup>H NMR spectroscopies of the title hybrid materials indicate that there are van der Waals interactions between O atoms of the heteropolyoxometalates and water molecules, as well as the N and O atoms of the amino acids and methyl urea moieties. The molecular structures of synthesized hybrid materials contain discrete entities of l-leucinium, l-prolinium or methyluronium and water molecules that surround every [(PO<sub>4</sub>)M<sub>12</sub>O<sub>36</sub>]<sup>3-</sup> anion, over the extended crystalline network. The observed bands in Raman spectra of <b style="">(2) </b>and<b style=""> (3) </b>demonstrate that the [(PO<sub>4</sub>)W<sub>12</sub>O<sub>36</sub>]<sup>3-</sup> anion retains its “Keggin structure”. At <i>p</i>H = 4 – 7, the characteristic bands of the Keggin anion [(PO<sub>4</sub>)M<sub>12</sub>O<sub>36</sub>]<sup>3−</sup>(M = Mo, W) appear at 210 and 260 nm in the UV spectra, respectively.
Description: 51-54
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(01) [January 2011]

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