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

• Polymer 1 is the third homonuclear 3D framework with chelidamic acid.
• The chelidamic acid in 1 exhibits two different coordination modes.
• Polymer 1 presents a novel binodal (4,6)-connected 3D topology (44.62)(44.610.8)2.
• Polymer 1 can act as good candidates for efficient blue emission materials.

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.

The third homonuclear 3D framework {Cd2.5(CAM)(HCAM)(H2O)7 · 1.5H2O}n (1) based on chelidamic acid, which presents two different μ4/μ5 coordination modes in 1 and is abbreviated to HCAM2 − and CAM3 −, respectively, in writing molecular formula. Polymer 1 adopts an unusual (4,6)-connected 3D topology with the Schläfli symbol (44.62)(44.610.8)2.Figure optionsDownload as PowerPoint slide