title: Neutral penta- and hexacoordinate silicon(IV) complexes containing two bidentate ligands derived from the alpha-amino acids (S)-alanine, (S)-phenylalanine, and (S)-tert-leucine.
abstract: The neutral hexacoordinate silicon(IV) complex 6 (SiO(2)N(4) skeleton) and the neutral pentacoordinate silicon(IV) complexes 7-11 (SiO(2)N(2)C skeletons) were synthesized from Si(NCO)(4) and RSi(NCO)(3) (R = Me, Ph), respectively. The compounds were structurally characterized by solid-state NMR spectroscopy (6-11), solution NMR spectroscopy (6 and 10), and single-crystal X-ray diffraction (8 and 11 were studied as the solvates 8 x CH(3)CN and 11 x C(5)H(12) x 0.5 CH(3)CN, respectively). The silicon(IV) complexes 6 (octahedral Si-coordination polyhedron) and 7-11 (trigonal-bipyramidal Si-coordination polyhedra) each contain two bidentate ligands derived from an alpha-amino acid: (S)-alanine, (S)-phenylalanine, or (S)-tert-leucine. The deprotonated amino acids act as monoanionic (6) or as mono- and dianionic ligands (7-11). The experimental investigations were complemented by computational studies of the stereoisomers of 6 and 7.
authors.affiliation: Universität Würzburg, Institut für Anorganische Chemie, Am Hubland, 97074 Würzburg, Germany.
authors.forename: Smaranda
authors.initials: S
authors.lastname: Cota
authors.forename: Matthias
authors.initials: M
authors.lastname: Beyer
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Bertermann
authors.forename: Christian
authors.initials: C
authors.lastname: Burschka
authors.forename: Kathrin
authors.initials: K
authors.lastname: Götz
authors.forename: Martin
authors.initials: M
authors.lastname: Kaupp
authors.forename: Reinhold
authors.initials: R
authors.lastname: Tacke
mesh_terms: D000409:Alanine / Q000737:chemistry*; D000596:Amino Acids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007930:Leucine / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D010649:Phenylalanine / Q000737:chemistry*; D017655:Silicon Compounds / Q000737:chemistry*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000596:Amino Acids; D008024:Ligands; D017655:Silicon Compounds; D010649:Phenylalanine; D007930:Leucine; D000409:Alanine