(n-Bu4N)x[Pd(dmit)2] (x = 0.5 and 0.33): Metal-like conductivity v.s. stacking of “true” dimers with metal-metal bond; Comparison with δ-TTF[Pd(dmit)2]2
1988; Elsevier BV; Volume: 27; Issue: 3-4 Linguagem: Inglês
10.1016/0379-6779(88)90167-1
ISSN1879-3290
AutoresJean-Pierre Legros, Lydie Valade, P. Cassoux,
Tópico(s)Organometallic Complex Synthesis and Catalysis
Resumo(n-Bu4N)0.5[Pd(dmit)2] (I) and (n-Bu4N)0.33[Pd(dmit)2] (II) have been isolated as single-crystals allowing four-probe conductivity measurements and crystal structure determination. Their temperature-dependent conductivities exhibit a metal-like behavior followed by a transition towards a semi-conductive state. This behavior is reminiscent of that previously reported for δ-TTF[Pd(dmit)2]2 (III). Transition temperatures are (I): 120K, (II): 240K and (III): 120K. The transition is irreversible for (I) and reversible for (II) and for (III). The three compounds have a similar structure made of stacked [Pd(dmit)2]22x− dimers with Pd-Pd bond lengths ranging from 3.04 to 33.11Å. The stacks are arranged in layers, and close S…S contacts form a two-dimensional network. The cations lie between these layers. The n-Bu4N groups are highly disordered.
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