title: Neutral hexa- and pentacoordinate silicon(IV) complexes with SiO(6) and SiO(4)N skeletons.
abstract: The neutral heteroleptic hexacoordinate silicon(IV) complexes 4 and 5 (SiO(6) skeletons) and the neutral pentacoordinate silicon(IV) complexes 7-9 (SiO(4)N skeletons) were synthesized, starting from the hexacoordinate precursor 2 and the pentacoordinate precursor 6, respectively. In these reactions, two monoanionic cyanato-N ligands are replaced by one dianionic bidentate O,O-chelate ligand. Compounds 4, 5, and 7-9 were characterized by single-crystal X-ray diffraction and solid-state and solution NMR spectroscopy. The chiral silicon(IV) complexes 4, 5, 7, and 8 were obtained as racemic mixtures, whereas 9 was isolated as a cocrystallizate consisting of the two diastereomers, (C,S)-9 and (A,S)-9 (ratio 1:1). The stereodynamics of 5 and 8 were studied by variable-temperature (1)H NMR experiments.
authors.affiliation: Universität Würzburg, Institut für Anorganische Chemie, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Seiler
authors.forename: Christian
authors.initials: C
authors.lastname: Burschka
authors.forename: Tassilo
authors.initials: T
authors.lastname: Fenske
authors.forename: Dennis
authors.initials: D
authors.lastname: Troegel
authors.forename: Reinhold
authors.initials: R
authors.lastname: Tacke