DOI: 10.1051/jp1:1994150
J. Phys. I France 4 (1994) 441-451

The first ET salt with a metal complex anion containing a selenocyanate ligand, (ET) ₂TIlHg(SeCN) ₄ : synthesis, structure and properties

L. I. Buravov¹, N. D. Kushch¹, V. N. Laukhin¹, A. G. Khomenko¹, E. B. Yagubskii¹, M. V. Kartsovnik², A. E. Kovalev², L. P. Rozenberg², R. P. Shibaeva², M. A. Tanatar³, V. S. Yefanov³, V. V. Dyakin³ and V. A. Bondarenko<sup>4

1</sup>  Institute of Chemical Physics in Chernogolovka, Russian Academy of Science, Chernogolovka, 142432, Russia
²  Institute of Solid State Physics, Russian Academy of Science, Chernogolovka, 142432, Russia
³  Institute of Surface Chemistry, Ukrainian Academy of Sciences, Kiev, Ukraine
⁴  Institute of Semiconductors, Ukrainian Academy of Sciences, Kiev, Ukraine

(Received 8 October 1993, accepted 25 November 1993)

Abstract
Synthesis of the first ET salt with a metal complex anion containing a selenocyanate ligand, -(ET) ₂TlHg(SeCN) ₄, and its structure are reported. The temperature dependence of conductivity and thermopower in varions crystallographic directions and the Shubnikov-de Haase oscillations have been studied. Distinctions of the bond length distributions in three crystallographically independent ET have been found, which may result in some charge localization in the radical-cation layer. A detailed comparison of the structure and properties of the compound obtained to its thiocyanate analog has been performed. It bas been shown that in the -(ET) ₂TIHg(SeCN) ₄ salt there is no low-temperature phase transition characteristic of the -(ET) ₂MHg(SCN) ₄ compounds with M=K, Tl and Rb.

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