Journal
MOLECULES
Volume 27, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/molecules27206926
Keywords
chirality; tetrathiafulvalene; chiroptical properties; crystal structure determination; DFT calculations; magnetic properties
Funding
- French Ministry of Foreign Affairs
- University of Angers
- Eiffel scholarship
- Babes-Bolyai University
- Erasmus+ Program
- Romanian Ministry of Research, Innovation and Digitalization, CNCS/CCCDI-UEFISCDI [PN-III-P4-ID-PCCF-2016-0088]
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Chiral bis(TTF) diamides were successfully synthesized from 1,2-cyclohexanediamine and the corresponding TTF acyl chlorides with good yields. The structural and chiroptical features of these new chiral TTF donors were characterized by experimental and computational methods.
Chiral bis(TTF) diamides have been obtained in good yields (54-74%) from 1,2-cyclohexane-diamine and the corresponding TTF acyl chlorides. The (R,R)-1 and (S,S)-1 enantiomers have been characterized by circular dichroism and the racemic form by single-crystal X-ray diffraction. The neutral racemic bis(TTF)-diamide shows the formation of a pincer-like framework in the solid state, thanks to the intramolecular S center dot center dot center dot S interactions. The chemical oxidation in a solution using FeCl3 provides stable oxidized species, while the electrocrystallization experiments provided radical cation salts. In particular, single-crystal resistivity measurements on the racemic donor with AsF6- as a counterion demonstrate semiconductor behavior in this material. The DFT and TD-DFT calculations support the structural and chiroptical features of these new chiral TTF donors.
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