σ Bonds: Electronic structure, photophysics, and photochemistry of oligosilanes

Autor:	Roman Imhof, Heather A. Fogarty, Deborah L. Casher, Thorsten Schepers, David W. Rooklin, Josef Michl
Rok vydání:	2003
Předmět:	Chemistry General Chemical Engineering General Chemistry Electronic structure Electron Chromophore Photochemistry Electronic states Delocalized electron chemistry.chemical_compound Computational chemistry Disilane Luminescence Conformational isomerism
Zdroj:	Pure and Applied Chemistry. 75:999-1020
ISSN:	1365-3075 0033-4545
DOI:	10.1351/pac200375080999
Popis:	The making and breaking of σ bonds is an integral part of almost all photochemical reactions. Yet, the electronic states of σ electrons are not nearly as well understood as the states of π-electron systems. Efforts in our laboratory to enhance the current state of their understanding are described, using the specific example of oligosilanes. We address the intrinsically cyclic nature of σ delocalization and its dependence on chain length and conformation, both in terms of theory and spectroscopic experiments, from the simplest disilane chromophore to the spectral properties of the individual conformers of permethylated heptasilane. We also describe a new low-energy luminescence from certain conformers of permethylated oligosilanes.
Databáze:	OpenAIRE
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