Abstract
The search of new one-dimensional (1D) conducting compounds cannot be conducted only from geometrical considerations, for example, by looking at the various ways to associate coordination polyhedra to form chains. Two other conditions must be fulfilled: a condition external to the chain that implies that they be stable with respect to one another, in relation with a certain ionicity of the network, and an internal condition on cation-cation direct interaction to obtain metallic conductivity. A more empirical way to start with consists in considering the charge density wave type phenomenon and to see the various possible evolutions from a given material. These considerations are illustrated on the basis of a continuous evolution from di- to trichalcogenides, then halogenotetrachalcogenides, doped materials, and finally waved 1D compounds.
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