title: Dialkyl dichalcogen cations.
abstract: One electron oxidation of dialkyl diselenides and ditellurides is achieved with NO(+)CF(3)SO(3)(-). According to ab initio calculations the radical cations have a trans stucture. In the solid state they dimerize to rectangular units [R-Te](4)(2+) and [R-Se](4)(2+). The long SeSe and TeTe bond is obviously due to a pi*-pi* interaction.
authors.affiliation: Freie Universität Berlin, Institut für Chemie und Biochemie Fabeckstrasse 34-36, 14195, Berlin, Germany.
authors.forename: Birgit
authors.initials: B
authors.lastname: Mueller
authors.forename: Helmut
authors.initials: H
authors.lastname: Poleschner
authors.forename: Konrad
authors.initials: K
authors.lastname: Seppelt