A new type of two-dimensional organic conductors: Alkylammonium bis[1,2,5]thiadiazolotetracyanoquinodimethanides.
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概要
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Anion radical salts of bis[1,2,5]thiadiazolotetracyanoquinodimethan (BTDA) containing forty kinds of alkylammonium ions were prepared whose molar ratios are unique for each cation and changed from 1:1 (<B>2A–2L</B>) to 2:3 (<B>2M–2Z</B>), 1:2 (<B>2a–2m</B>), and 2:5 (<B>2n</B>) with elongation of the side chains. The electrical conductivities of the salts are largely affected by the molar ratio and the spatial requirement of cations (ρ<SUB>RT</SUB> 3.1 Ω cm for <B>2a</B> and 4.2×10<SUP>6</SUP> Ω cm for <B>2L</B>), and some of the salts exhibit high electrical conductivities (ρ<SUB>RT</SUB> 3.1–8.3 Ω cm for <B>2a–2e</B>) with small anisotropy (ρ<SUB>⁄⁄</SUB> 1.7 Ω cm, ρ<SUB>⊥</SUB> 21.6 Ω cm for a single crystal of <B>2g</B>). Three salts (<B>2A</B>, <B>2M</B>, and <B>2g</B>) showed semiconducting temperature dependence of electrical conductivity with the activation energies of 0.12–0.20 eV. The X-ray study of three kinds of the salts (<B>2A</B>, <B>2g</B>, and <B>2m</B>) revealed that two-dimensional networks are formed by S–N≡C interactions (3.12–3.33 Å) of BTDA anion radicals. The crystals of <B>2A</B> and <B>2g</B> showing higher conductivities consist of two-dimensionally expanded "ribbon" networks accompanied with equally spaced columnar stackings while molecules are pairing to form dyads in <B>2m</B> which exhibits lower conductivity.
- 公益社団法人 日本化学会の論文
著者
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Suzuki Takanori
Deparment Of Biological Science Graduate School Of Science Hiroshima University
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Yamashita Yoshiro
Department Of Biology Faculty Of Science Kumamoto University
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Mukai Toshio
Department Of Nuclear Engineering Faculty Of Engineering Kyushu University
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Miyashi Tsutomu
Department Of Chemistry Faculty Of Science Tohoku University
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SAITO Gunzi
Institute for Molecular Science
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Kabuto Chizuko
Instumental Analysis for Chemistry, Faculty of Science, Tohoku University
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Mukai Toshio
Department of Chemistry, Faculty of Science Tohoku University
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