Two chiral cadmium carboxylate framework isomers generated by spontaneous resolution: synthesis,structures and properties |
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| Authors: | Yang-Yang Chen Chunhong Tan Li-Ping Song Juan Zhou Qiongyao Zeng |
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| Institution: | 1. School of Chemistry and Chemical Engineering, University of South China, Hengyang, P. R. China;2. School of Mechanical Engineering, University of South China, Hengyang, P. R. China |
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| 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. |
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| Keywords: | Cadmium chiral coordination polymer helix chain luminescent circular dichroism |
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