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A Molecular Metal with Ion-Conducting Channels

Takayoshi Nakamura, T. Akutagawa, K. Honda, A. E. Underhill, A. T. Coomber, and R. H. Friend
[Nature, Vol. 394, pp. 159-162, 1998]

A charge transfer salt Li0.6(15-crown-5-ether)[Ni(dmit)2]2 (dmit = 4,5-dimercapto-1,3-dithiol-2-thione) exhibits both electron and ion conductivity. The stacks of the nickel complex provide a pathway for electron conduction and stacks of the crown ethers provide channels for Li ion motion. Metallic behavior is observed above 250 K by conductivity studies. Evidence for the lithium-ion motion above 200 K is seen by solid-state NMR studies and coupling of the electron and ion motions is suggested.

Fig. 1

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