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The programmed synthesis of salts containing polyoxoanions and organic cations is one of the interesting areas in chemistry, since it allows forming compounds with unique structures and properties.1–3 In this domain, single-enantiomer compounds have attracted attention due to potential applications in nonlinear optics and chiral catalysts.4 One approach for the synthesis of such compounds involves the use of single-enantiomer organic components such as single-enantiomer amino acids.4 Here, we report on the synthesis, spectroscopic characterization and single-crystal X-ray determination of the title salt, (C6H14NO2)3[PW12O40]·4.5(H2O), Fig. 1. The title salt was prepared by the following method: A solution of H3PW12O40 (5.76 g, 2 mmol) in water (40 ml) was added to a solution of L-iso-leucine (0.787 g, 6 mmol) in HCl (10 ml, 1 M) and stirred at room temperature for two hours; then, the resulting solution was filtered and kept until colorless crystals were obtained. 31P-NMR (D2O, 202.46 MHz, 85% H3PO4, dppm): –15.61(s). 1H-NMR (D2O, 500.13 MHz, TMS, dppm): 0.90 (t, CH3), 0.91 (d, CH3), 1.27 (m, CH), 1.44 (m, CH), 1.83 (m, CH), 3.81 (s, CH), 8.10 (s, NH3). 13C-NMR (D2O, 125.77 MHz, TMS, dppm): 11.61, 14.48, 25.15, 35.81, 56.27, 170.32. IR (KBr, cm–1): 3530, 2931, 1723, 1601, 1481, 1245, 1083, 984, 900, 804, 511. The crystallographic data are summarized in Table 1, and selected bond lengths and angles are given in Table 2. The asymmetric unit of the title salt contains two symmetrically independent [PW12O40] polyoxoanions, six L-iso-leucinium cations and nine solvent water molecules (Fig. 2). The [PW12O40] anion (Figs. 1S and 2S) shows a classical a-Keggin structure,5 which consists of a central PO4 tetrahedron surrounded by four vertex-sharing W3O13 groups. Each W3O13 X-ray Structure Analysis Online

x-ray structure analysis online

Synthesis and Crystal Structure of Tris(&lt;font size=-1&gt;L&lt;/font&gt;-&lt;i&gt;iso&lt;/i&gt;-leucinium(2&lt;i&gt;S&lt;/i&gt;,3&lt;i&gt;S&lt;/i&gt;))-dodecatungstophosphate 4.5 hydrate