Ei. Zhilyaeva et al., New organic conductor (EDOEDT)(4)Hg3Br8 comprising cation layers of alpha ''- and kappa(4 x 4)-types, SYNTH METAL, 107(2), 1999, pp. 123-127
The (EDOEDT)(4)Hg3Br8 radical cation salt of 4,5-ethylenedioxy-4',5'-ethyle
ndithiotetrathiafulvalene has been synthesized as a mixture of two crystall
ine phases. Phase 1 is characterized by a semiconducting type of conductivi
ty and the ESR peak-to-peak linewidth equal to 70-95 G. Phase 2 exhibits me
tal-like conductivity down to 105 K and the ESR peak-to-peak linewidth of 3
5-54 G. The X-ray crystal structure analysis of phase 1 reveals three cryst
allographically distinct donor molecule layers in the asymmetric part of th
e unit cell, one of them being composed of the stacks and the two others ar
e built of mutually perpendicular tetramers. The polarized reflectance spec
tra of phase 1 are discussed. (C) 1999 Elsevier Science S.A. All rights res
erved.