Abstract
AbstractDifferential scanning calorimetry (DSC) and X‐ray diffraction measurements have been performed on pentasodium trihydrogen tetraselenate dihydrate Na5H3(SeO4)4·2H2O and deuterated Na5D3(SeO4)4·2D2O crystals. Any distinct anomaly around 428 K in the DSC curves for both crystals is suggested to be caused by a chemical reaction of thermal decomposition with hydrolysis at high temperature. The space group symmetry (triclinic P$ \bar 1 $) and the structure parameters are determined at room temperature. The hydrogen atom in the centrosymmetric O‐H(D)‐O hydrogen bond of both crystals is found to be equally distributed at two equivalent sites in the bond. The expansions of two O‐H‐O hydrogen bonds by the substitution of deuterium are observed to be 0.016(6) and 0.011(4) Å. The geometric isotope effect on hydrogen bonds is confirmed to be existed in Na5H3(SeO4)4·2H2O. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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