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Yang B, Yu SB, Wang H, Zhang DW, Li ZT. 2:2 Complexes from Diphenylpyridiniums and Cucurbit[8]uril: Encapsulation-Promoted Dimerization of Electrostatically Repulsing Pyridiniums. Chem Asian J 2018; 13:1312-1317. [PMID: 29480650 DOI: 10.1002/asia.201701816] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 01/29/2018] [Indexed: 01/07/2023]
Abstract
Rigid linear compounds G1 and G2, which contained two 4-phenylpyridinium (PhPy+ ) units, have been prepared to investigate their binding with cucurbit[8]uril (CB[8]). X-ray crystallographic structures revealed that in the solid state both compounds were included by CB[8], through antiparallel stacking, to form 2:2 quaternary complexes (G1)2 @(CB[8])2 and (G2)2 @(CB[8])2 . For the former complex, CB[8] entrapped G1 by holding two heterodimers of its Py+ and benzyl units, which were at opposite ends of the backbone. In contrast, for the first time, the second complex disclosed parallel stacking of two cationic Py+ units of G2 in the cavity of CB[8] in the solid state, despite the generation of important electrostatic repulsion. Isothermal titrations in water afforded high apparent association constants of 4.36×106 and 6.43×106 m-1 for 1:1 complexes G1@CB[8] and G2@CB[8], respectively, and 1 H NMR spectroscopy experiments in D2 O confirmed a similar stacking pattern to that observed in the solid state. A previous study and crystal structures of the 2:1 complexes formed between three new controls, G3-5, and CB[8] did not display such unusual stacking of the cationic Py+ unit; this may be attributed to the multivalency of the two CB[8] encapsulation interactions.
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Affiliation(s)
- Bo Yang
- Department of Chemistry, Collaborative Innovation Centre of, Chemistry for Energy Materials (iChEM), Shanghai Key, Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 220 Handan Road, Shanghai, 200433, P.R. China
| | - Shang-Bo Yu
- Department of Chemistry, Collaborative Innovation Centre of, Chemistry for Energy Materials (iChEM), Shanghai Key, Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 220 Handan Road, Shanghai, 200433, P.R. China
| | - Hui Wang
- Department of Chemistry, Collaborative Innovation Centre of, Chemistry for Energy Materials (iChEM), Shanghai Key, Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 220 Handan Road, Shanghai, 200433, P.R. China
| | - Dan-Wei Zhang
- Department of Chemistry, Collaborative Innovation Centre of, Chemistry for Energy Materials (iChEM), Shanghai Key, Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 220 Handan Road, Shanghai, 200433, P.R. China
| | - Zhan-Ting Li
- Department of Chemistry, Collaborative Innovation Centre of, Chemistry for Energy Materials (iChEM), Shanghai Key, Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 220 Handan Road, Shanghai, 200433, P.R. China
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Wiemann M, Jonkheijm P. Stimuli-Responsive Cucurbit[n]uril-Mediated Host-Guest Complexes on Surfaces. Isr J Chem 2017. [DOI: 10.1002/ijch.201700109] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Maike Wiemann
- Bioinspired Molecular Engineering Laboratory of the MIRA Institute of Biomedical Technology and Technical Medicine and the Molecular Nanofabrication Group of the MESA Institute for Nanotechnology; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering Laboratory of the MIRA Institute of Biomedical Technology and Technical Medicine and the Molecular Nanofabrication Group of the MESA Institute for Nanotechnology; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
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