{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T04:28:35Z","timestamp":1780460915271,"version":"3.54.1"},"reference-count":78,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2018,4,25]],"date-time":"2018-04-25T00:00:00Z","timestamp":1524614400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["aces.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry \u0097 An Asian Journal"],"published-print":{"date-parts":[[2018,5,18]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Rigid linear compounds <jats:bold>G1<\/jats:bold> and <jats:bold>G2<\/jats:bold>, which contained two 4\u2010phenylpyridinium (PhPy<jats:sup>+<\/jats:sup>) units, have been prepared to investigate their binding with cucurbit[8]uril (CB[8]). X\u2010ray crystallographic structures revealed that in the solid state both compounds were included by CB[8], through antiparallel stacking, to form 2:2 quaternary complexes (<jats:bold>G1<\/jats:bold>)<jats:sub>2<\/jats:sub>@(CB[8])<jats:sub>2<\/jats:sub> and (<jats:bold>G2<\/jats:bold>)<jats:sub>2<\/jats:sub>@(CB[8])<jats:sub>2<\/jats:sub>. For the former complex, CB[8] entrapped <jats:bold>G1<\/jats:bold> by holding two heterodimers of its Py<jats:sup>+<\/jats:sup> 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<jats:sup>+<\/jats:sup> units of <jats:bold>G2<\/jats:bold> 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\u00d710<jats:sup>6<\/jats:sup> and 6.43\u00d710<jats:sup>6<\/jats:sup>\u2009<jats:sc>m<\/jats:sc><jats:sup>\u22121<\/jats:sup> for 1:1 complexes <jats:bold>G1<\/jats:bold>@CB[8] and <jats:bold>G2<\/jats:bold>@CB[8], respectively, and <jats:sup>1<\/jats:sup>H\u2005NMR spectroscopy experiments in D<jats:sub>2<\/jats:sub>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, <jats:bold>G3\u20135<\/jats:bold>, and CB[8] did not display such unusual stacking of the cationic Py<jats:sup>+<\/jats:sup> unit; this may be attributed to the multivalency of the two CB[8] encapsulation interactions.<\/jats:p>","DOI":"10.1002\/asia.201701816","type":"journal-article","created":{"date-parts":[[2018,2,26]],"date-time":"2018-02-26T05:06:43Z","timestamp":1519621603000},"page":"1312-1317","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["2:2 Complexes from Diphenylpyridiniums and Cucurbit[8]uril: Encapsulation\u2010Promoted Dimerization of Electrostatically Repulsing Pyridiniums"],"prefix":"10.1002","volume":"13","author":[{"given":"Bo","family":"Yang","sequence":"first","affiliation":[{"name":"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"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shang\u2010Bo","family":"Yu","sequence":"additional","affiliation":[{"name":"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"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Wang","sequence":"additional","affiliation":[{"name":"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. 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