Cage Structures for Polyborate Ions

Science  12 Aug 1966:
Vol. 153, Issue 3737, pp. 737-739
DOI: 10.1126/science.153.3737.737


Conventional concepts of chemical bonding appear inadequate to explain the structures of the anhydrous polyborates. A cage-type structure with occluded oxide ion is proposed for the octaborate, hexaborate, and tetraborate ions. The proposed structure is discussed in terms of the composition, x-ray diffraction patterns, and nuclear magnetic resonance spectra of the sodium polyborates.