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σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes

In order to evaluate the influence of germanium atoms in oligo- and polysilanes, a number of oligosilane compounds were prepared where two or more silicon atoms were replaced by germanium. While it can be expected that the structural features of thus altered molecules do not change much, the more in...

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Autores principales: Hlina, Johann, Zitz, Rainer, Wagner, Harald, Stella, Filippo, Baumgartner, Judith, Marschner, Christoph
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier Sequoia [etc.] 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236089/
https://www.ncbi.nlm.nih.gov/pubmed/25431502
http://dx.doi.org/10.1016/j.ica.2014.07.005
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author Hlina, Johann
Zitz, Rainer
Wagner, Harald
Stella, Filippo
Baumgartner, Judith
Marschner, Christoph
author_facet Hlina, Johann
Zitz, Rainer
Wagner, Harald
Stella, Filippo
Baumgartner, Judith
Marschner, Christoph
author_sort Hlina, Johann
collection PubMed
description In order to evaluate the influence of germanium atoms in oligo- and polysilanes, a number of oligosilane compounds were prepared where two or more silicon atoms were replaced by germanium. While it can be expected that the structural features of thus altered molecules do not change much, the more interesting question is, whether this modification would have a profound influence on the electronic structure, in particular on the property of σ-bond electron delocalization. The UV-spectroscopic comparison of the oligosilanes with germanium enriched oligosilanes and also with oligogermanes showed a remarkable uniform picture. The expected bathochromic shift for oligogermanes and Ge-enriched oligosilanes was observed but its extent was very small. For the low energy absorption band the bathochromic shift from a hexasilane chain (256 nm) to a hexagermane chain with identical substituent patterns (259 nm) amounts to a mere 3 nm.
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spelling pubmed-42360892014-11-25 σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes Hlina, Johann Zitz, Rainer Wagner, Harald Stella, Filippo Baumgartner, Judith Marschner, Christoph Inorganica Chim Acta Article In order to evaluate the influence of germanium atoms in oligo- and polysilanes, a number of oligosilane compounds were prepared where two or more silicon atoms were replaced by germanium. While it can be expected that the structural features of thus altered molecules do not change much, the more interesting question is, whether this modification would have a profound influence on the electronic structure, in particular on the property of σ-bond electron delocalization. The UV-spectroscopic comparison of the oligosilanes with germanium enriched oligosilanes and also with oligogermanes showed a remarkable uniform picture. The expected bathochromic shift for oligogermanes and Ge-enriched oligosilanes was observed but its extent was very small. For the low energy absorption band the bathochromic shift from a hexasilane chain (256 nm) to a hexagermane chain with identical substituent patterns (259 nm) amounts to a mere 3 nm. Elsevier Sequoia [etc.] 2014-10-01 /pmc/articles/PMC4236089/ /pubmed/25431502 http://dx.doi.org/10.1016/j.ica.2014.07.005 Text en © 2014 The Authors https://creativecommons.org/licenses/by/3.0/This work is licensed under a Creative Commons Attribution 3.0 Unported License (https://creativecommons.org/licenses/by/3.0/) .
spellingShingle Article
Hlina, Johann
Zitz, Rainer
Wagner, Harald
Stella, Filippo
Baumgartner, Judith
Marschner, Christoph
σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title_full σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title_fullStr σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title_full_unstemmed σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title_short σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
title_sort σ-bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236089/
https://www.ncbi.nlm.nih.gov/pubmed/25431502
http://dx.doi.org/10.1016/j.ica.2014.07.005
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