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Oligothienyl catenated germanes and silanes: synthesis, structure, properties

Oligothienyl catenated germanes and silanes: synthesis, structure, properties

Lam, Kevin ORCID: 0000-0003-1481-9212 (2018) Oligothienyl catenated germanes and silanes: synthesis, structure, properties. Dalton Transactions, 2018 (15). pp. 5431-5444. ISSN 1477-9226 (Print), 1477-9234 (Online) (doi:https://doi.org/10.1039/C8DT00256H)

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Abstract

The synthesis of two new groups of oligothienyl catenated silanes and germanes, Me5M2Thn (1a-b), Me5M2ThnM2Me5 (2ac) (terminal), and ThnM2Me4Thn (3a-d) (internal) (M= Si, Ge; n= 2, 3; Th= 2- or 2,5-thienyl) is reported. The study of their structural parameters as well as of their spectral (NMR), electrochemical (CV) and optical (UV/vis absorbance, luminescence) properties has been performed in detail; in addition, the unexpected compound [Th2Si2Me4Th]2 (3a’) is also studied. Theoretical investigations have been performed for model compounds in order to establish structure – property relationships. The molecular structures of 2a (Me5Si2Th2Si2Me5), 2b (Me5Ge2Th2Ge2Me5), 3a (Th2Si2Me4Th2) and 3b (Th2Ge2Me4Th2) have been investigated by X-ray diffraction analysis. An effective conjugation with flattening of both Th planes in terminal 2a and 2b was observed. The main trends in the dependence of the optical and electrochemical properties on the structural parameters have been established. All of the compounds studied exhibit a strong emission within the 378-563 nm range, the maximal quantum yield (up to 77 %) is observed for the Si derivative 3a’. For the majority of the compounds the quantum yields (20-30 %) are significantly larger than for 2,2’-bi- and 2,2’:5’,5’’- terthiophenes. Due to their good emission properties, these compounds could be used to develop new materials with specific spectral properties.

Item Type: Article
Uncontrolled Keywords: Germanium, electrochemistry, catenated compounds, semi conductors
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 15 Mar 2019 01:38
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: GREAT e
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/19453

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