title: σ-Bond Electron Delocalization in Oligosilanes as Function of Substitution Pattern, Chain Length, and Spatial Orientation.
abstract: Polysilanes are known to exhibit the interesting property of σ-bond electron delocalization. By employing optical spectroscopy (UV-vis), it is possible to judge the degree of delocalization and also differentiate parts of the molecules which are conjugated or not. The current study compares oligosilanes of similar chain length but different substitution pattern. The size of the substituents determines the spatial orientation of the main chain and also controls the conformational flexibility. The chemical nature of the substituents affects the orbital energies of the molecules and thus the positions of the absorption bands.
authors.affiliation: Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria. johann.hlina@tugraz.at.
authors.forename: Johann
authors.initials: J
authors.lastname: Hlina
authors.affiliation: Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria. filippo.stella@unipd.it.
authors.forename: Filippo
authors.initials: F
authors.lastname: Stella
authors.affiliation: Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria. m.meshgi@ucc.ie.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Aghazadeh Meshgi
authors.affiliation: Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria. christoph.marschner@tugraz.at.
authors.forename: Christoph
authors.initials: C
authors.lastname: Marschner
authors.affiliation: Institut für Chemie, Karl Franzens Universität Graz, Stremayrgasse 9, 8010 Graz, Austria. baumgartner@tugraz.at.
authors.forename: Judith
authors.initials: J
authors.lastname: Baumgartner
mesh_terms: D004583:Electrons; D008958:Models, Molecular; D008968:Molecular Conformation; D000072458:Orientation, Spatial; D011789:Quantum Theory; D012821:Silanes / Q000737:chemistry*
chemical_list: D012821:Silanes
keywords: UV-spectroscopy; oligosilanes; single crystal diffraction analysis; σ-bond electron delocalization