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Open AccessArticle

Incorporating Methyl and Phenyl Substituted Stannylene Units into Oligosilanes. The Influence on Optical Absorption Properties

1
Institute for Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
2
Institute for Chemistry, Karl-Franzens-University Graz, Stremayrgasse 9, 8010 Graz, Austria
*
Authors to whom correspondence should be addressed.
Molecules 2017, 22(12), 2212; https://doi.org/10.3390/molecules22122212
Received: 14 November 2017 / Revised: 4 December 2017 / Accepted: 5 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Progress in Silicon and Organosilicon Chemistry)
Molecules containing catenated heavy group 14 atoms are known to exhibit the interesting property of σ-bond electron delocalization. While this is well studied for oligo- and polysilanes the current paper addresses the UV-absorption properties of small tin containing oligosilanes in order to evaluate the effects of Sn–Si and Sn–Sn bonds as well as the results of substituent exchange from methyl to phenyl groups. The new stannasilanes were compared to previously investigated oligosilanes of equal chain lengths and substituent pattern. Replacing the central SiMe2 group in a pentasilane by a SnMe2 unit caused a bathochromic shift of the low-energy band (λmax = 260 nm) of 14 nm in the UV spectrum. If, instead of a SnMe2, a SnPh2 unit is incorporated, the bathochromic shift of 33 nm is substantially larger. Keeping the SnMe2 unit and replacing the two central silicon with tin atoms causes shift of the respective band (λ = 286 nm) some 26 nm to the red. A similar approach for hexasilanes where the model oligosilane [(Me3Si)3Si]2(SiMe2)2max = 253 nm) was modified in a way that the central tetramethyldisilanylene unit was exchanged for a tetraphenyldistannanylene caused a 50 nm bathochromic shift to a low-energy band with λmax = 303 nm. View Full-Text
Keywords: stannaoligosilanes; σ-bond electron delocalization; UV-spectroscopy; single crystal diffraction analysis stannaoligosilanes; σ-bond electron delocalization; UV-spectroscopy; single crystal diffraction analysis
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Stella, F.; Marschner, C.; Baumgartner, J. Incorporating Methyl and Phenyl Substituted Stannylene Units into Oligosilanes. The Influence on Optical Absorption Properties. Molecules 2017, 22, 2212.

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