The last unknown crystal structure among the alkali-metal dodecahydro- closo -dodecaborates (A 2 B 12 H 12 ), that of Na 2 B 12 H 12, was determined by powder X-ray diffraction. Compared to the structural symmetries of its neighboring, cubic, alkali-metal analogs, i.e., the lighter Li 2 B 12 H 12 ( Pa 3̅) and the heavier K 2 B 12 H 12 ( Fm 3̅), Na 2 B 12 H 12 displays an intermediate monoclinic ( P 2 1 / n ) structural arrangement. This result allows us to understand more thoroughly the effect of cation size on the observed structural behavior of this technologically relevant series of compounds.
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Her et al. (2009) studied this question.
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