Abstract
A new microporous galloborate of Rb2[Ga(B5O10)]·4H2O has been synthesized under mild hydrothermal conditions, which was characterized by chemical analysis, powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), differential thermal analysis/thermogravimetry (DTA-TG), and single crystal X-ray diffraction. Its structure possesses a 3D open framework with 11-ring channels constructed by B5O10 clusters and GaO4 units. The enthalpies of solution of RbCl(s), KCl(s), K2[Ga(B5O10)]·4H2O(s), and Rb2[Ga(B5O10)]·4H2O(s) in the solvents at 298.15 K were measured, respectively. By using the standard molar enthalpies of formation for RbCl(s), KCl(s), and K2[Ga(B5O10)]·4H2O(s), ΔfHmo of Rb2[Ga(B5O10)]·4H2O(s) was obtained as –(5762.9 ± 9.1) kJ·mol–1 on the basis of the appropriate thermochemical cycle. Moreover, ΔfHmo ([Ga(B5O10)]2–) of –(4100.8 ± 9.1) kJ·mol–1 has also estimated by a group contribution method, which can be used to predict the standard molar enthalpies of formation of other galloborates co...
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