Luminescent 2-D double-layered polymer, [(CuI)4(CH3SCH3)3]infinity, containing helical chains constructed by flower-basket-shaped Cu4I4 clusters.

A new route for the synthesis of coordination compounds with dimethyl sulfide ligand is reported; the prepared compound is a novel 2-D framework with a 1-D right-handed and left-handed helical structure, which is unique in the sense that the fundamental units are unusual Cu4I4 clusters.