A rare case of 2D+1D → 2D Cd (II) coordination polymer without any entanglement s: S ynthesis, structure and luminescent propert y

The reactions of CdCl 2 ·2.5H 2 O with mixed ligands, H 2 tfbdc and hmt, under different metal-to-ligand ratios, afford two coordination polymers, namely, [Cd(hmt)(tfbdc)(H 2 O) 2 ] 2 ·3H 2 O ( 1 ) and {[NH 4 ] 2 [Cd 2 (H 2 hmt)(tfbdc) 2 Cl 4 ][Cd(H 2 hmt) (tfbdc)Cl 2 ]}·2H 2 O ( 2 ). Both the complexes have been structurally characterized by X-ray data. Complex 1 has a 2D rectangular grid built up by tfbdc 2 – and hmt ligands, while 2 consists of distinct 1D anionic ladder [Cd 2 (H 2 hmt)(tfbdc) 2 Cl 4 ] 2‒ and 2D grid [Cd(H 2 hmt)(tfbdc)Cl 2 ] in a crystal. Further, in 2 , the 2D net is parallel to the 1D ladder without mutual entanglement or interdigitation. Despite the hydrogen bond interactions and the F···F interactions, only a 2D supermolecular structure is formed in 2 . Thus, compound 2 is the first case of 2D+1D→2D coordination polymer without any entanglements.