HYDROGEN BONDING TO AROMATIC PI SYSTEMS. Katherine N. Robertson, Pradip K. Bakshi, T. Stanley Cameron, and Osvald Knop. Department of Chemistry, Dalhousie University, Halifax NS, Canada B3H 4J3.
The preliminary investigation of the electron-density distribution in the
N-H...pi(phenyl) bond in dabco(BPh4)2 (reported at the
1995 ACA meeting in Montreal) has been followed up by a more thorough study (LT
data, multipole refinement) intended to demonstrate unambiguously the
existence, and describe the geometry, of the H...phenyl bond in this crystal.
Details are also reported of our recent determinations of the crystal
structures of the tetraphenylborates of the guanidinium (-60deg.C),
biguanidinium, 2,3-bis(2-pyridyl)pyrazinium,
1,2,3,4-tetrahydro-9-acridinammonium (tacrine),
[Ni(MeCN)2(N,N'-Me2-en)2]2+, and
[Ph3B-NH2(CH2)2-NMe2]