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2020-02-05

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/184513

Combining chirality and hydrogen bonding in methylated ethylenedithio- tetrathiafulvalene primary diamide precursors and radical cation salts

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https://doi.org/10.1021/acs.cgd.9b01665

Abstract

Methyl- and dimethyl-ethylenedithio-tetrathiafulvalene ortho-diamide donors Me-EDT-TTF(CONH2)2 (1a) and DM-EDT- TTF(CONH2)2 (1b) have been prepared by the direct reaction of the corresponding diester precursors with aqueous ammonia solutions. The neutral (rac)-1a, (R)-1a, and (S,S)-1b donors have been characterized by single crystal X-ray diffraction. In the three compounds, which crystallized in the non-centrosymmetric monoclinic space group P21, the amide groups are disordered, yet they form the classical intra-molecular hydrogen bond for such an ortho-diamide motif. Electro- crystallization experiments afforded the mixed valence radical cation salts[(S,S)-1b]2XO4 and [(R,R)-1b]2XO4 (X = Cl, Re) containing four independent donors in the asymmetric unit, with the positive charge localized essentially on two donors, while the two others are neutral. The topology of the organic layer is of β′-type. Single crystal resistivity measurements show semiconducting behavior for [(S,S)-1b]2ClO4 and [(R,R)-1b]2ReO4, with a room temperature conductivity of 5 × 10−5 S cm−1 and activation energies Ea ≈ 3000 K. Tight-binding band structure calculations of extended Hückel type in combination with density functional theory calculations are in agreement with the semiconducting behavior and suggest a localized Mott type semiconductor rather than a band gap semiconductor.

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Semiconductors, Molècules, Sal

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Semiconductors, Molecules, Salt

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Articles publicats en revistes (Ciència dels Materials i Química Física)

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MROWEH, Nabil, et al. Combining chirality and hydrogen bonding in methylated ethylenedithio- tetrathiafulvalene primary diamide precursors and radical cation salts. Crystal Growth & Design. 2020. Vol. 20, num. 4, pags. 2516-2526. ISSN 1528-7483. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/184513

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