Journal
CHIRALITY
Volume 25, Issue 8, Pages 466-474Publisher
WILEY
DOI: 10.1002/chir.22210
Keywords
chiral tetrathiafulvalenes; circular dichroism; crystalline structures; molecular conductors; theoretical calculations
Funding
- National Agency for Research (ANR) [09-BLAN-0045-01]
- COST Action D35
- CNRS (France)
- Spanish MEC [CTQ2011-26507]
- Generalitat Valenciana
- EPSRC [EP/C510488/1]
- Engineering and Physical Sciences Research Council [EP/C510488/1] Funding Source: researchfish
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The (S,S,S,S) and (R,R,R,R) enantiomers of tetramethyl-bis(ethylenedithio)-tetrathiafulvalene (TM-BEDT-TTF) show equatorial conformation for the four methyl groups in the solid state, according to the single-crystal X-ray analyses. Theoretical calculations at the Density Functional Theory (DFT) and time-dependent (TD) DFT levels indicate higher gas phase stability for the axial conformer than the equatorial one by 1.25kcal center dot mole-1 and allow the assignment of the UV-vis and circular dichroism transitions. A complete series of radical cation salts of 1:1 stoichiometry with the triiodide anion I3- was obtained by electrocrystallization of both enantiopure and racemic forms of the donor. In the packing the donors are organized in dimers that further interact through S center dot center dot center dot S intermolecular contacts and the triiodide anions lie parallel to pairs of oxidized donors. The conductivity of the racemate, which adopts the same, but disordered, structural type, is considerably lower, with much higher activation energy. Chirality 25:466-474, 2013.(c) 2013 Wiley Periodicals, Inc.
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