Abstract
A novel mixed alkali metal hydrated borate NaCs[B10O14(OH)4] was synthesized under hydrothermal conditions. Its structure was determined by single-crystal X-ray diffraction and further characterized by FT-IR spectroscopy, TG-DTA, powder X-ray diffraction, and chemical analysis. NaCs[B10O14(OH)4] crystallizes in monoclinic space group P2/c with a = 7.6588(3) A, b = 9.0074(3) A, c = 11.8708(6) A, and β = 115.682(3)°. The crystal structure of NaCs[B10O14(OH)4] consists of Na–O, Cs–O polyhedral, and [B10O14(OH)4]2− polyborate anions. [B10O14(OH)4]2− units are connected together through common oxygen atoms forming a 1D helical chain-like structure, which are further connected by O–H···O hydrogen bonds forming a 3D supramolecular structure. Through a designed thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be −7888.6 ± 8.1 kJ mol−1 by using a heat conduction microcalorimeter.
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