A novel (4,6)-connected 3D metal-organic framework based on chelidamic acid: Synthesis, crystal structure and photoluminescence

The aqueous solution reaction of chelidamic acid (H3CAM), succinic acid, CdCl2·2.5H2O in the air at 50°C, along with little of ammonia added dropwise, gave rise to colorless crystals {Cd2.5(CAM)(HCAM)(H2O)7·1.5H2O}n (1), which presents an interesting (4,6)-connected 3D structure. Notably, 1 is the third homonuclear 3D framework based on H3CAM ligand, which acts as two different μ4/μ5-bridges in 1 and was abbreviated to HCAM2− and CAM3−, respectively, in writing molecular formula of 1. Polymer 1 exhibits strong blue photoluminescence at room temperature.