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- W1977486885 abstract "Abstract New TCNQ anion radical salts with various 1.2-dithiolylium and the bi(3.5-dimethylamino) 1.2-diselenolylium cations have been prepared. The conductivity values, determined on compacted powder are about 10−1 - 10−4 (Ω cm)−1 for 1 : 1 stoichiometry salts and about 0,5 (Ω cm)−1 for complex salts whose optical spectra exhibit a peak around 3000 cm−1 characteristic of monodimensional organic conductors. Optical conductivity, from reflectivity measurements, for bi(3,5-dimethylamino)-1,2-diselenolylium-TCNQ 1 : 2 is equal to 385 (Ω cm)−1. RX structures of 5-t-butyl-3-methylthio-1,2-dithiolylium-TCNQ 1 : 2 and 3-p-methoxyphenyl-1,2 dithiolylium-TCNQ 2 : 3 show segregated stacks for counterion and TCNQ molecules with zig-zag chains for 1 : 2 salts and triadic chains for 2 : 3 salt. The room temperature value of stack axis conductivity of 5-t-butyl-3-methylthio-1,2-dithiolylium-TCNQ 1 : 2 is 4 (Ω cm)−1. The temperature dependence of the conductivity of simple crystal correspond to a semi-conductor material, ΔE = 0,185 eV. The temperature dependence of the magnetic susceptibility has been determined. The results seem to be characteristic of a regular spin-chain with a Spin-Peierls transition at 4K." @default.
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- W1977486885 date "1986-03-01" @default.
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- W1977486885 title "Conducteurs Organiques: Synthèse, structure et études physiques de sels de l'anion radical du tétracyanoquinodiméthane avec des cations dithiole-1, 2 ylium et disélénole-1, 2 ylium" @default.
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