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- Title
Electrical Properties and Structure of the Organic Metallic Compound bis (tetraselenotetracene)-iodide, (TSeT)<sub>2</sub>-I.
- Authors
Hilti, Bruno; Mayer, Carl W.; Rihs, Grety
- Abstract
The preparation of the new organic metallic compound (TSeT)2-I is reported. The crystal structure of the free donor, TSeT, is discussed and compared with the crystal structure of (TSeT)2-I. The latter has the orthorhombic space group P21212 and hence is not isomorphous with the analogous compounds (TSeT)2-Cl and (TSeT)2-Br, described by Shchegolev et al. [4]. In contrast to those complexes (TSeT)2-I consists of only one set of crystallographically equivalent chains and therefore its transition to the low-temperature conducting state ( Fig. 6) is also of different type. The d. c. resistivity at 300 K ranges from 10−3 to 1.5 ·. 10−4 Ω cm. The temperature dependence of the d.c. resistivity of the title compound is given: in the temperature range from 300 to 80 K the normalized d.c. resistivity is described by ρ(T)/ρ(300) ∝ T1.7. Between 80 and 70 K a slight deviation from the above law has been detected which is taken as an indication of a phase transition; its nature is, however, not yet definable. The low-temperature conducting state reached at about 70 K shows an almost constant resistivity in the interval 60 K to 45 K. Its normalized d.c. resistivity in the range 4.5 K-50 K is described by ρ(T)/ρ(300) ∝ (T−Tm)3, with Tm = 50 K. The value of the normalized resistivity extrapolated to O K is 0.75.
- Publication
Helvetica Chimica Acta, 1978, Vol 61, Issue 4, p1462
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19780610430