An unprecedented 2D copper(i)–cyanide complex with 20-membered metal rings: the effect of the co-ligand 4,5-diazafluoren-9-one

Abstract

A hydrothermal reaction of CuCl₂·2H₂O, 4,5-diazafluoren-9-one (L) and K₃[Fe(CN)₆], which is used as an environment friendly cyanide source, produces a two-dimensional copper cyanide complex Cu₁₀(CN)₁₀L₄ (1). In the complex, the L ligands act as corner and bridge ligands simultaneously. With the help of the corner ligands, infinite Cu(CN)_∞ chains are formed. The chains are further bridged by another type of L ligand forming a 2D layer with a Cu₂₀(CN)₁₈L₂ macrocycle, which shows blue photoluminescence related to centered π–π* transitions of the L ligand.