Electronic Conductivity of 7,7,8,8-Tetracyanoquinodimethane Salts Containing Cation Derived from Piperadinium Ring and p-Xyiene -α, α′-diyl Group

Abstract

7, 7, 8, 8-Tetracyanoquinodimethane (CQ) salts containing cation derived from piperadinium ring and p-xylene-α, α′-diyl (p-xyiylene) group were pnepared, and specific resistances p and activation energies E2 of cation-CQ salts were measured. The p-valuse of simple salts were almost ca. 107 Ω·cm, and when neutral CQ(CQ°) was added to simple salts, the p-values decreased markedly as follows; The solubility of simple salts in N, N′-dimethylformamide (DMF) and acetonitrile, which was important for the preparation of CQ complex salts, decreased as follows; As a result, decrease in the resistivity by adding CQ° molecules was considered to be caused by both piperadinium ring and p-xylylene group. It was presumed that p-xylylene group was effective for keeping the distance between ionic sites, increasing solubility of CQ simple salt, and forming the complexes of CQ° and CQ7 molecules, and piperadinium ring was effective for incresing electronic conduction by controlling [the CQ°·CQ7 arrangement against the cation. © 1974, The Chemical Society of Japan. All rights reserved.