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Keywords:

  • Water;
  • Boron;
  • Structure elucidation;
  • Thermal analysis;
  • Hydrogen bonds

Abstract

Hydrates of the dihydronium salt of the superweak anion B12F122– have been synthesized and structurally characterized. The structure of (H3O)2B12F12·6H2O consists of a cubic close-packed (CCP) array of B12F122– anions intercalated with nonplanar, infinite networks of O6 rings composed of H3O+ ions and H2O molecules. Similar to other salts of B12F122–, (H3O)2B12F12·6H2O exhibits rapid structural modification, termed latent porosity, and reversibly desorbswater to form other hydrate phases: (H3O)2B12F12·4H2O,(H3O)2B12F12·2H2O, and (H3O)2B12F12. (H3O)2B12F12·6H2O is another example of the weak coordinating properties of the B12F122– anion.