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Rapid Commun."],"published-print":{"date-parts":[[2018,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In this work, a Pd<jats:sub>2<\/jats:sub>L<jats:sub>4<\/jats:sub> metallacage <jats:bold>2\u2022<\/jats:bold>([BF<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>)<jats:sub>4<\/jats:sub> with four pillar[5]arene units is first prepared and characterized by 1D multinuclear NMR (<jats:sup>1<\/jats:sup>H, <jats:sup>11<\/jats:sup>B, and <jats:sup>19<\/jats:sup>F NMR), 2D <jats:sup>1<\/jats:sup>H\u2212<jats:sup>1<\/jats:sup>H correlation spectra, <jats:sup>1<\/jats:sup>H\u2212<jats:sup>13<\/jats:sup>C heteronuclear single quantum coherence, and diffusion\u2010ordered NMR spectroscopy, and electrospray ionization time\u2010of\u2010flight mass spectrometry. By the introduction of a ditopic guest molecule <jats:bold>3<\/jats:bold> into a chloroform solution of <jats:bold>2\u2022<\/jats:bold>([BF<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>)<jats:sub>4<\/jats:sub>, a supramolecular polymer network gel is successfully constructed based on the metal coordination interactions and host\u2212guest recognition between the pillar[5]arene units of <jats:bold>2\u2022<\/jats:bold>([BF<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>)<jats:sub>4<\/jats:sub> and neutral ditopic guest molecule <jats:bold>3<\/jats:bold>. The temperature and pH responsivenesses of the supramolecular gel are studied, which are further employed for the controlled release of different cargos. As a demonstration, emodin and methylene blue are trapped in the cavities of the metallacage and in the pores of the supramolecular gel, respectively. Methylene blue is first released along with the gel\u2013sol transition while emodin is then released by the further addition of acid to destroy the metallacage. This study explores the use of metallacage\u2010cored supramolecular network gels for sequential controlled release and contributes to the development of smart and adaptive materials.<\/jats:p>","DOI":"10.1002\/marc.201800655","type":"journal-article","created":{"date-parts":[[2018,10,15]],"date-time":"2018-10-15T08:48:20Z","timestamp":1539593300000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Construction of Metallacage\u2010Cored Supramolecular Gel by Hierarchical Self\u2010Assembly of Metal Coordination and Pillar[5]arene\u2010Based Host\u2212Guest Recognition"],"prefix":"10.1002","volume":"39","author":[{"given":"Yuezhou","family":"Liu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Engineering Center for Chemistry of High\u2010Performance &amp; Novel Materials Department of Chemistry Zhejiang University  Hangzhou 310027 P. R. 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