A chiral Salen-based Zn(II)-Cd(II) heterometallic metal-organic framework: synthesis, crystal structure, and optical properties

Abstract

A two-dimensional (2D) chiral heterometallic Zn(II)-Cd(II) metal-organic framework (MOF), {[(CdI₂(ZnL)₂·DMF}_n (1, H₂L = (R,R)-N,N'-bis(3-(4-pyridyl)salicylidene)-1,2-cyclohexanediamine, DMF = N,N-dimethylformamide), was synthesized with predesigned chiral metallosalen ZnL and CdI₂ via solvothermal reaction. MOF 1 crystallizes in the orthorhombic chiral space group P2₁2₁2 and exhibits a 2D chiral framework consisting of right (P) handed 2₁ helices. Topological analysis indicates that the 2D structure of 1 could be simplified as a uninodal sql topology. The luminescence experiment revealed that MOF 1 showed intense circularly polarized luminescence (CPL), suggesting that it can be a potential CPL material.

Graphical Abstract

Keywords:

• Metal-organic framework
• heterometallic
• chirality
• photoluminescence
• circularly polarized luminescence

Disclosure statement

No potential conflict of interest was reported by the authors.

References

Additional information

Funding

This work was financially supported by the Guangdong Major Project of Basic and Applied Research (No. 2019B030302009), National Natural Science Foundation of China (Nos. 21731002 and 21871172), the Fundamental Research Funds for the Central Universities (No. 21619405), the Guangzhou Science and Technology Program (No. 202002030411), and Jinan University.

This work was financially supported by the Guangdong Major Project of Basic and Applied Research (No. 2019B030302009), National Natural Science Foundation of China (Nos. 21731002 and 21871172), the Fundamental Research Funds for the Central Universities (No. 21619405), the Guangzhou Science and Technology Program (No. 202002030411), and Jinan University.