title: Di-, tri-, and tetra(pentafluorophenyl) derivatives for oligotopic anion-π interactions.
abstract: The present study describes a series of pentafluorobenzyl ammonium salts with two, three, or four C6F5 units in order to investigate simultaneous interactions of several perfluorinated arenes with anions in the crystalline state. Most of the structures show multiple anion-π contacts. However, only 6·2HI reveals an effective encapsulation of the iodide ion by the aromatic units. For comparison, the structure of 4b is investigated because it offers two π-systems with inverse charge distribution to a bromide anion. Only the electron-deficient π-system of the pentafluorophenyl group interacts with the anion.
authors.affiliation: Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Giese
authors.forename: Markus
authors.initials: M
authors.lastname: Albrecht
authors.forename: Simon
authors.initials: S
authors.lastname: Steike
authors.forename: Anton
authors.initials: A
authors.lastname: Ackermann
authors.forename: Arto
authors.initials: A
authors.lastname: Valkonen
authors.forename: Kari
authors.initials: K
authors.lastname: Rissanen