[Ph₃PH][nido-B₁₁H₁₄]

The structure of the tetradecahydro-nido-undecaborate(1-) anion, as its triphenylphosphonium salt, is reported (C₁₈H₁₆P⁺.B₁₁H₁₄^-). The borane anion has the expected icosahedral fragment geometry, with crystallographically imposed mirror symmetry.

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