Control of electronic state in the 2D hydrogen-bonded system: β″-(CnDT-EDO-TTF) 2(PF 6) x ( n = 5, 6, 7, 8)

• Published in: Synthetic metals Vol. 144; no. 1; pp. 89 - 95
• Main Authors: Suzuki, Hideaki, Yamashita, Kazuki, Suto, Miyuki, Maejima, Tomoko, Kimura, Shinya, Mori, Hatsumi, Nishio, Yutaka, Kajita, Kohji, Moriyama, Hiroshi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 08.07.2004; Amsterdam Elsevier Science; New York, NY
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity of specific materials; Control of electronic state; Electronic transport in condensed matter; Exact sciences and technology; Hydrogen-bonded network; Organic donor; Physics; Polymers; organic compounds (including organic semiconductors); Steric hindrance; TTF; Hydrogen-bonded network; Control of electronic state; Steric hindrance; TTF; Organic donor; Band structure; Electronic structure; Electrical conductivity; Synthesis; Hydrogen bonds; Organic conductors; Crystal structure
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2004.02.011

A new series of CnDT-EDO-TTF [ n=5, 6, 7, 8; ( cis-1,2-cycloalkylene-1,2-dithio)ethylenedioxytetrathiafulvalene] donors containing cycloalkylene and ethylenedioxy groups as a source of intermolecular hydrogen bonds and the steric hindrance has been synthesized. The charge transfer (CT) salts, β″-(CnDT-EDO-TTF) 2(PF 6) x ( n=5, 6, 7, 8), have the similar β″-type donor arrangements owing to the intermolecular hydrogen-bonded network (CH⋯O) in the two-dimensional (2D) plane. The steric hindrance of cycloalkylene groups enlarges the intermolecular distance in the order from n=5, 6, 7, to 8 salt. The calculated bandwidth, however, decreases in the different order from n=8, 5, 7, to 6 salt in consideration of the 2D interactions. All salts, β″-(CnDT-EDO-TTF) 2(PF 6) x , show a metallic feature down to 1.5 K, and the temperature dependences indicate the negative chemical pressure effect from n=8, 5, 7, to 6 salt in the same order of the calculated bandwidth.