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- W3137654426 abstract "A π-electron donor incorporating pyran-4-ylidene moiety, 2-(pyran-4-ylidene)-1,3-dithiole (PDT, 1a), and its derivatives (1b–e) have been synthesized. Cyclic voltammetry revealed that the derivatives of 1 exhibited two pairs of redox waves. Comparison of the first redox potentials (E1) indicated that the donating ability of PDT (E1 = −0.16 V vs. Fc/Fc+, in benzonitrile) is stronger than that of TTF (E1 = −0.09 V), but is weaker than the sulfur analog TPDT (E1 = −0.19 V). X-ray structure analyses of radical cation salts based on the ethylendithio derivative (1d)2X (X = ClO4, ReO4, and GaCl4) revealed that the donors form two-dimensional conducting sheets, in which the donors adopt the so-called β-type packing with a uniform head-to-tail stacking. Calculation of the overlap integrals of the HOMOs suggest that (1d)2X has a small intrastack overlap compared to the TTF-type conductors because of a head-to-tail stacking of the unsymmetrical π-electron framework. A tight-binding band calculation suggested that all the salts have quasi-one-dimensional Fermi surfaces. They exhibited relatively high conductivity of σrt = 0.79–20 S cm−1 on a single crystal and showed weak but metal-like temperature dependence of resistivity." @default.
- W3137654426 created "2021-03-29" @default.
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- W3137654426 date "2021-04-15" @default.
- W3137654426 modified "2023-09-27" @default.
- W3137654426 title "Organic Conductors with Narrow Bandwidth Based on 2-(Pyran-4-ylidene)-1,3-dithiole" @default.
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- W3137654426 doi "https://doi.org/10.1246/bcsj.20200406" @default.
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