Feature article. Molecular metals and superconductors

The field of molecular metals and superconductors has developed rapidly since the first molecular metal was discovered in the late 1960s. The most extensive range of compounds are based on planar organic donor molecules containing sulfur or selenium atoms and complex metal anions containing multi-sulfur ligands. This review discusses the types of molecules involved and the relationship between the solid-state structures of these compounds and their conducting and superconducting properties.