Effect of ion coordination on the conformational and electronic structure of 3,4-Bis(alkylthio)thiophenes

Fransesca Goldoni, Luciano Antolini, Geoffrey Pourtois, Albertus P.H.J. Schenning, René A.J. Janssen, Roberto Lazzaroni, Jean Luc Brédas, E. W. Meijer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A joint experimental and theoretical approach is used to study the coordination of soft transition metal ions with 3,4-bis(alkylthio)thiophenes. The synthesis of [PdCl2{3,4-bis(3-methylbutylthio)thiophene}], [PtCl2{3,4-bis(3-methylbutylthio)thiophene}] and [PdCl2{3′,4′-bis[2-(S)-methylbutylthio]- 2,2′:5′,2″-terthiophene}] by exchange of the benzonitrile ligands in [PdCl2(PhCN)2] and [PtCl2(PhCN)2] for the thiophene derivatives with thioether side chains is described. Changes in the conformational and electronic structure of the molecules were studied by X-ray diffraction, cyclic voltammetry, and optical and NMR spectroscopy; these experimental data are interpreted with the help of quantum mechanical calculations based on density functional theory. The complexes crystallize in a mixture of diastereoisomers, these stereoisomers are in equilibrium in solution, as observed by variable-temperature NMR spectroscopy. The complexation diminishes the electron-donor ability of the sulfur to the thiophene ring, as observed from the blueshift of the absorption maximum and from the absence of an oxidation wave in the positive potential regime for monomeric 3,4-bis(alkylthio) thiophenes. In this way it is possible to tune the properties of thiophene derivatives by ion coordination.

Original languageEnglish (US)
Pages (from-to)821-828
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number3
DOIs
StatePublished - Jan 1 2001

Keywords

  • Density functional calculations
  • S ligands
  • Sulfur heterocycles
  • Transition metals

ASJC Scopus subject areas

  • Inorganic Chemistry

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