Syntheses and Characterization of Two Novel Inorganic-Organic Hybrid Materials Based on Polyoxotungstoborate: [L-C2H5NO2-H]3[H2BW12O40].5H2O and [CH4N2O-H]2[H3BW12O40].5H2O (C2H5NO2 = Glycine; CH4N2O = Urea),

Abstract

Two novel hy drated in or ganic-or ganic hy brids, namely [L-C2H5NO2-H]3[H2BW12O40]·<br><br>·5H2O (1) and [CH4N2O-H]2[H3BW12O40]·5H2O (2), where C2H5NO2 and CH4N2O are<br><br>glycine and urea, re spec tively, have been syn the sized and char ac ter ized by CHN<br><br>microanalysis, IR, UV, and 1H NMR spectroscopies. Ac cord ing to the ob tained re sults,<br><br>mo lec u lar struc ture of 1 con sists of tungstoborate an ions linked to glycinium cat ions via<br><br>van der Waals in ter ac tions and hy dro gen bond ing. Three [L-C2H5NO2-H]+ moi eties en -<br><br>com pass each [H2BW12O40]3– and, al most cer tainly, the same is true for 2. The O at oms<br><br>of polyoxometalates and wa ter, as well as the N at oms of L-glycine and urea are in volved<br><br>in hy dro gen bond ing. Char ac ter is tic UV bands of the Keggin an ion, a-H5[BW12O40]·<br><br>·19H2O, are ob served at 257 nm, as would be ex pected.