Structural versatility of anion-pi interactions in halide salts with pentafluorophenyl substituted cations.
A series of pentafluorophenyl substituted ammonium, iminium, amidinium, and phosphonium halides are presented which show extensive anion-pi interactions. Hereby, the well-known anion-donor-pi-acceptor as well as "eta6" anion-pi-complex type interactions are observed. The latter is supported by fixation of the anion on top of the aromatic system through hydrogen bonding. This arrangement was investigated by theoretical methods showing a highly attractive anion-pi interaction. In addition an eta2-type coordination of the anions to only two C-atoms of the electron-deficient ring system is described.
Albrecht
Markus
M
Institut für Organische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany. markus.albrecht@oc.rwth-aachen.de
Wessel
Claudia
C
de Groot
Marita
M
Rissanen
Kari
K
Lüchow
Arne
A