Chiral diethyl-EDT-TTF and tetraethyl-BEDT-TTF: synthesis, structural characterization, radical cation salt and charge transfer complexes - Aix-Marseille Université Access content directly
Journal Articles CrystEngComm Year : 2022

Chiral diethyl-EDT-TTF and tetraethyl-BEDT-TTF: synthesis, structural characterization, radical cation salt and charge transfer complexes

Nabil Mroweh
  • Function : Author
Thomas Cauchy
Narcis Avarvari

Abstract

The chiral electroactive precursors diethyl-ethylenedithio-tetrathiafulvalene (DE-EDT-TTF 1) and tetraethyl-bis(ethylenedithio)-tetrathiafulvalene (TE-BEDT-TTF 2) have been synthesized in the racemic form and separated in pure enantiomers, together with the meso form of 2, by chiral HPLC. All the neutral forms (rac)-, (S)- and (R)-1, (rac)-, (S)-, (R)- and (meso)-2 have been structurally characterized by single crystal X-ray diffraction analysis. In all the structures the ethyl substituents are in axial positions, in agreement with the results of the DFT calculations, which indicate that the axial conformation of the ethyl substituents of 1 is more stable by 0.95 kcal mol−1 than the equatorial conformation in the gas phase. Circular dichroism measurements combined with TD-DFT calculations are also in favour of the predominance of the axial conformers in solution. The crystalline radical cation salt [(S)-1]PF6 and charge transfer complexes [(R)-1]TCNQF4 and [(meso)-2]TCNQF4 have been structurally characterized. A segregated donor–acceptor structure is observed for [(R)-1]TCNQF4, while in [(meso)-2]TCNQF4 donors and acceptors alternate in the stacks.

Domains

Cristallography
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Dates and versions

hal-03855125 , version 1 (16-11-2022)

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Nabil Mroweh, Thomas Cauchy, Nicolas Vanthuyne, Narcis Avarvari. Chiral diethyl-EDT-TTF and tetraethyl-BEDT-TTF: synthesis, structural characterization, radical cation salt and charge transfer complexes. CrystEngComm, 2022, 24 (35), pp.6187-6197. ⟨10.1039/D2CE00857B⟩. ⟨hal-03855125⟩
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