A pillared-layered copper(i) halide-based metal-organic framework exhibiting dual emission, and piezochromic and thermochromic properties with a large temperature-dependent emission red-shift.

We report a new copper halide-based compound [Cu6I6Br2C16H32N4] (1) with a 3D 2-fold interpenetrated framework structure. Upon excitation at 290 nm and 350 nm, compound 1 shows dual emission at ca. 500 nm and ca. 530 nm. As the temperature decreased from 300 K down to 6 K, the luminescent properties of compound 1 show large red shifts of 120 nm and 72 nm, respectively.