Large Room Temperature Magnetization Enhancement in a Copper-Based Photoactive Metal–Organic Framework

The tris­(pyridin-4-yl)­amine ligand was found to exhibit a radical-actuated coloration phenomenon, and a novel copper-based color-changeable metal–organic framework (MOF) was synthesized via this photoactive ligand. After light irradiation, the photogenerated stable radicals in this framework induced increasing amplitude of magnetization (32%) at room temperature, being the largest enhancement among radical-based photochromic systems.