Acta Crystallographica Section B

Structural Science

Volume 56, Part 2 (April 2000)

research papers

Acta Cryst. (2000). B56, 254-260 [ doi:10.1107/S0108768199012318 ]

Short N⁺-HPh hydrogen bonds in ammonium tetraphenylborate characterized by neutron diffraction

T. Steiner and S. A. Mason

Abstract: The crystal structures of ammonium tetraphenylborate, NH₄⁺·BPh₄^-, are determined by neutron diffraction at 20 and 293 K. At both temperatures, all four N-H vectors of the ammonium ion are time-average-oriented at the midpoints of the phenyl rings of neighboring anions. The N-HPh distances, HM 2.067 and NM 3.023 Å, are exceptionally short (M = aromatic midpoint). Even at 20 K the ammonium ion performs large amplitude motions which allow the N-H vectors to sample the entire face of the aromatic system.

Keywords: Hydrogen bonds; Ammonium tetraphenylborate; Neutron diffraction.


	Structure factor file (CIF format) (37.7 kbytes) Contains datablock lt

	Structure factor file (CIF format) (21.9 kbytes) Contains datablock rt

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