Sometimes described as molecular wires, Krogmann's salt exhibits highly anisotropic electrical conductivity.

[3] Krogmann's salt most commonly refers to a platinum metal complex of the formula K2[Pt(CN)4X0.3] where X is usually bromine (or sometimes chlorine).

Krogmann's salt is a series of partially oxidized tetracyanoplatinate complexes linked by the platinum-platinum bonds on the top and bottom faces of the planar [Pt(CN)4]n− anions.

This salt forms infinite stacks in the solid state based on the overlap of the dz2 orbitals.

[3] Krogmann's salt has no recognizable phase range and is characterized by broad and intense intervalence bands in its electronic spectra.