Abstract
Two three-dimensional (3-D) chiral coordination polymers, [Cd(NDC)(DMF)]n (1L and 1D: H2NDC = 1,4-naphthalenedicarboxylic acid and DMF = N,N′-dimethylformamide), have been synthesized by introducing the rigid achiral dicarboxylic acid ligand under solvo-thermal conditions, without chiral template or additives. Both chiral Cd-CPs were characterized by single crystal X-ray crystallography, and structural analysis indicates that 1L and 1D are enantiomers based on the zigzag [Cd(COO)2(DMF)]n rod secondary building units, featuring the left- or right-hand 21 Cd-O-C-O-Cd helix chains and left- or right-hand 41 screw [Cd(NDC)]n columns, respectively. The FT-IR, TGA, powder X-ray diffraction and solid-state luminescence of 1 have been investigated. It is intriguing that the evidence from the circular dichroism spectroscopies confirms enantiomeric excess in the whole spontaneous resolution crystallization.
Graphical Abstract
![](/cms/asset/b042a281-cdd7-4b77-a080-9c59fe7bc10b/gcoo_a_1564285_uf0001_c.jpg)
Acknowledgements
The authors would like to thank anonymous referees for helpful discussions on crystal structures.
Disclosure statement
No potential conflict of interest was reported by the authors.