Citation: Wenya DING, Fangfei XU, Jiayu GU, Xinran CHEN, Kai CHEN. Synthesis and crystal structure of three cucurbit[6]uril-cadmium supramolecular assemblies[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(4): 808-816. doi: 10.11862/CJIC.20260012 shu

Synthesis and crystal structure of three cucurbit[6]uril-cadmium supramolecular assemblies

Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science & Technology, Nanjing 210044, China

Corresponding author: Kai CHEN, catqchen@163.com
Received Date: 13 January 2026
Revised Date: 16 March 2026

Figures(3)

5, 5′-dithiobis(2-nitrobenzoic acid) (H₂DTNB) was employed as the second ligand to react with cucurbit[6]uril (Q[6]) and Cd(NO₃)₂, and it was deprotonated or transformed into HDTNB^-, TNB^2- and NSB^2- (H₂TNB=5, 5′-thiobis(2-nitrobenzoic acid), H₂NSB=2-nitro-5-sulfobenzoic acid) under different conditions to afford three novel supramolecular assemblies with the formulas of [Cd(H₂O)₄(Q[6])](HDTNB)₂·3H₂O (1), [Cd(H₂O)₆]₂(TNB)₂·Q[6]·4H₂O (2) and [Cd(H₂O)₅(NSB)]₂·Q[6] (3). Singe-crystal diffraction (SC-XRD) analysis revealed that assembly 1 is constructed from 2D [Cd(H₂O)₄(Q[6])]²⁺ supramolecular layers and HDTNB^- supra molecular layers, the structure of assembly 2 is comprised of the 2D {[Cd(H₂O)₆]₂·Q[6]}⁴⁺ supramolecular layers and 1D TNB^2- supramolecular chains, while assembly 3 is built from the 3D Q[6] frameworks with [Cd(H₂O)₅(NSB)] supramolecular chains filled in the pores. Meanwhile, the noncovalent interactions between the ligands HDTNB^-/TNB^2-/NSB^2- and the outer-surface of Q[6] molecules contributed greatly to the formation of the supramolecular architecture of assemblies 1-3.
- supramolecular assembly,
- cucurbit[6]uril,
- cadmium,
- crystal structure,
- 5, 5'-dithiobis(2-nitrobenzoic acid)
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