Oligothienyl catenated germanes and silanes: Synthesis, structure, and properties

Kirill V. Zaitsev, Kevin Lam Georges, Oleg Kh Poleshchuk, Lyudmila G. Kuz'Mina, Andrei V. Churakov

Research output: Contribution to journalArticle

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Abstract

The synthesis of two new groups of oligothienyl catenated silanes and germanes, Me5M2Thn (1a-b), Me5M2ThnM2Me5 (2a-c) (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, and 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.

Original languageEnglish
Pages (from-to)5431-5444
Number of pages14
JournalDalton Transactions
Volume47
Issue number15
DOIs
Publication statusPublished - Jan 1 2018

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Silanes
Quantum yield
Electrochemical properties
X ray diffraction analysis
Molecular structure
Luminescence
Optical properties
Nuclear magnetic resonance
Derivatives
alpha-terthienyl

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Zaitsev, K. V., Lam Georges, K., Poleshchuk, O. K., Kuz'Mina, L. G., & Churakov, A. V. (2018). Oligothienyl catenated germanes and silanes: Synthesis, structure, and properties. Dalton Transactions, 47(15), 5431-5444. https://doi.org/10.1039/c8dt00256h

Oligothienyl catenated germanes and silanes : Synthesis, structure, and properties. / Zaitsev, Kirill V.; Lam Georges, Kevin; Poleshchuk, Oleg Kh; Kuz'Mina, Lyudmila G.; Churakov, Andrei V.

In: Dalton Transactions, Vol. 47, No. 15, 01.01.2018, p. 5431-5444.

Research output: Contribution to journalArticle

Zaitsev, KV, Lam Georges, K, Poleshchuk, OK, Kuz'Mina, LG & Churakov, AV 2018, 'Oligothienyl catenated germanes and silanes: Synthesis, structure, and properties', Dalton Transactions, vol. 47, no. 15, pp. 5431-5444. https://doi.org/10.1039/c8dt00256h
Zaitsev KV, Lam Georges K, Poleshchuk OK, Kuz'Mina LG, Churakov AV. Oligothienyl catenated germanes and silanes: Synthesis, structure, and properties. Dalton Transactions. 2018 Jan 1;47(15):5431-5444. https://doi.org/10.1039/c8dt00256h
Zaitsev, Kirill V. ; Lam Georges, Kevin ; Poleshchuk, Oleg Kh ; Kuz'Mina, Lyudmila G. ; Churakov, Andrei V. / Oligothienyl catenated germanes and silanes : Synthesis, structure, and properties. In: Dalton Transactions. 2018 ; Vol. 47, No. 15. pp. 5431-5444.
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