A photoluminescent interpenetrating metal–organic frame work based on Cu4I4 and novel azino-quinoline ligand

• A novel triply-interpenetrating Cu(I) metal-organic framework has been synthesized and characterized.
• It consists of Cu2I2 and an azino-quinoline ligand.
• The X-ray crystal structure analysis reveals that it is a 2-D coordination polymer containing distorted cubane type Cu4I4 SBU unit.
• Solid state fluorescence studies shows blue shift.
• Thermogravimetric analysis reveals thermal stability at 290 °C.

Synthesis of a novel, triply-interpenetrating metal–organic framework 1.H2O is described here. The coordination polymer was synthesized by simple reaction of Cu2I2 with an azino-quinoline ligand (L1). The X-ray crystal structure analysis reveals that the complex 1.H2O is a 2-D coordination polymer having (4,4′) grid network architecture. The ligand L1 possesses quinoline group and the 2-D structure of 1.H2O contains distorted cubane type Cu4I4 SBU unit. Each of the four Cu(I) ions posses tetrahedral coordination environment. Metal–organic framework in 1.H2O shows strong photoluminescence property at room temperature in solid state and emission spectra shows a blue shift of the peak in comparison to the free azino-quinoline ligand (L1). The coordination polymer 1.H2O was found to be stable up to 290 °C.