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High pressure behaviour of the organic semiconductor salt (TTF-BTD)2I3.


ABSTRACT: This study focuses on the effect of structure compression and cooling on the stereoelectronic properties of the planar π-conjugated TTF-BTD (TTF = tetrathiafulvalene; BTD = 2,1,3-benzothiadiazole) molecule, a prototypical example in which an electron-donor moiety is compactly annulated to an electron-acceptor moiety. Its partially oxidised iodine salt (TTF-BTD)2I3 is a crystalline semiconductor featuring segregated columns of TTF+0.5 units stacked via alternating short and long π-π interactions. We studied TTF-BTD at temperatures ranging from 300 K to 90 K and at pressures up to 7.5 GPa, using both X-ray diffraction and Raman spectroscopy to determine the properties of the compressed samples. Periodic DFT calculations and several theoretical tools were employed to characterize the calculated structural modifications and to predict the structural changes up to 60 GPa. The existence of an unprecedented new phase is predicted above 20 GPa, following a covalent bond formation between two neighbouring TTF-BTD units.

SUBMITTER: Montisci F 

PROVIDER: S-EPMC10664187 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature

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High pressure behaviour of the organic semiconductor salt (TTF-BTD)<sub>2</sub>I<sub>3</sub>.

Montisci Fabio F   Lanza Arianna A   Fisch Martin M   Sonneville Camille C   Geng Yan Y   Decurtins Silvio S   Reber Christian C   Liu Shi-Xia SX   Macchi Piero P  

Physical chemistry chemical physics : PCCP 20231122 45


This study focuses on the effect of structure compression and cooling on the stereoelectronic properties of the planar π-conjugated TTF-BTD (TTF = tetrathiafulvalene; BTD = 2,1,3-benzothiadiazole) molecule, a prototypical example in which an electron-donor moiety is compactly annulated to an electron-acceptor moiety. Its partially oxidised iodine salt (TTF-BTD)<sub>2</sub>I<sub>3</sub> is a crystalline semiconductor featuring segregated columns of TTF<sup>+0.5</sup> units stacked <i>via</i> alte  ...[more]

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