 The compound has an unusual structure, consisting of a chain of platinum atoms, and it exhibits unusual properties, being dark green, which is very unusual for platinum compounds.This species has been of interest in materials chemistry and solid-state physics because of its one-dimensional structure.It contains a linear chain of alternating [PtCl4]2− anions and [Pt(NH3)4]2+ cations, in which the platinum atoms are separated by 3.25 Å.