Benzyltrimethylammonium Tetramethoxoborate

In the title compound, C₁₀H₁₆N⁺.C₄H₁₂BO₄^- or [PhCH₂NMe₃][B(OMe)₄], the anion has essentially 2m (D_2 d) symmetry, with a tetragonal elongation to give two opposite O-B-O angles markedly smaller than the other four. Comparison with the structures of other salts indicates that this is an intrinsic property of the anion rather than the result of specific interionic or intermolecular interactions.

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