A series of new BEDO-TTF salts with the [Hg(SCN)(4)](2-) anion and Li+, K+,
NH4+, Rb+, and Cs+ cations has been prepared. The salts with Li, K, NH4, a
nd Rb show metallic behaviour down to 4 K, the Cs salt behaves as a metal d
own to 85 K, at lower temperatures a gradual increase of resistance takes p
lace. Crystals of (BEDO-TTF)(5)[CsHg(SCN)(4)](2) are triclinic: a=10.436(2)
, b=10.709(2), c = 19.973(4) Angstrom, alpha= 89.59(2), beta= 81.88(2), gam
ma= 72.76(2)degrees, P (1) over bar, Z= 1. The structure of this salt appea
rs as the alternation of BEDO-TTF donor layers of the 'I-3' type and inorga
nic layers composed of infinite anion chains incorporating Csf cations. (C)
1999 Published by Elsevier Science S.A. All rights reserved.