Constraining Homo- and Heteroanion Dimers in Ultraclose Proximity within a Self-Assembled Hexacationic Cage
| Autor: | Chuhao Lin, Shuai Fang, Qiong Chen, Sung Kuk Kim, Hao Li, Hongye Wang, Yating Wu, Ye Lei, Guangcheng Wu, Jonathan L. Sessler, Xin Hong, Hongliang Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Hydrogen bond Chemistry Condensation Cationic polymerization Hydrazone General Chemistry 010402 general chemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences symbols.namesake Crystallography Colloid and Surface Chemistry symbols Van der Waals radius Cage Single crystal |
| Zdroj: | Journal of the American Chemical Society. 142:20182-20190 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.0c10253 |
| Popis: | A hexacationic cage 36+ was synthesized via hydrazone condensation in aqueous acid. Cage 36+ bears three biscationic arms, each of which contains four relatively acidic protons, including one NH and three CH protons. These hydrogen bond donors, as well as its intrinsic cationic nature, enable cage 36+ to encapsulate two anions concurrently within its cavity. The axial asymmetrical nature of the biscationic arms allow the cage to recognize two different anions in a selective manner, to encompass bound heteroanion dimers, such as Cl-·NO3- and Cl-·Br-. Single crystal X-ray diffraction analyses reveal that in the solid state the two anions are constrained in ultraclose proximity within the cage; e.g., the Cl-···Cl- and Cl-···Br- distances are 3.2 and 2.9 A, respectively, which are shorter than the sum of their van der Waals radii. Evidence consistent with the sequential binding of two identical or disparate anions in CD3CN is also presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|