Short N+--H...Ph hydrogen bonds in ammonium tetraphenylborate characterized by neutron diffraction
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Updated: Oct 16, 2026

Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
Published on: December 1, 2020
1Institut fur Chemie--Krisallographie, Freie Universitat Berlin, Germany. steiner@chemie.fu-berlin.de
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-H...Ph distances, H...M 2.067 and N...M 3.023 A, 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.
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