title: New synthetic and structural aspects in the chemistry of alkylaluminum fluorides. The mutual influence of hard and soft ligands and the hybridization as rigorous structural criterion.
abstract: A general synthetic strategy starting from metal alkyls is reported based on the hydrogen difluoride anion as a suitable reagent for obtaining organometallic fluorides. The newly prepared compounds are [Me(4)N][(i-Bu)(2)AlF(2)] (1), [Ph(4)P][(i-Bu)(2)AlF(2)] (2), and [Ph(4)P][AlF(4)] (3), containing the tetrahedral anions [(i-Bu)(2)AlF(2)](-) and [AlF(4)](-). The actual structures are prototypes that allowed a comparison of inorganic and organometallic fluorides in the frame of the hard and soft acid and base principle, by means of ab initio calculations. A new theoretical model is designed to put in equation form the qualitative statements of the Bent rule. The model allows the rationalization of the tendencies of bond angle variation in [R(2)MX(2)] systems containing a main group metal (M), in terms of hybridization of the central atom and the reciprocal influence of hard and soft ligands.
authors.affiliation: Institut für Anorganische Chemie der Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany. mcimpoesu@yahoo.com
authors.forename: M
authors.initials: M
authors.lastname: Ferbinteanu
authors.forename: H W
authors.initials: HW
authors.lastname: Roesky
authors.forename: F
authors.initials: F
authors.lastname: Cimpoesu
authors.forename: M
authors.initials: M
authors.lastname: Atanasov
authors.forename: S
authors.initials: S
authors.lastname: Köpke
authors.forename: R
authors.initials: R
authors.lastname: Herbst-Irmer