{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T21:28:59Z","timestamp":1771104539312,"version":"3.50.1"},"reference-count":50,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2018,11,8]],"date-time":"2018-11-08T00:00:00Z","timestamp":1541635200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100010981","name":"Izumi Science and Technology Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100010981","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Macromolecular Bioscience"],"published-print":{"date-parts":[[2018,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The [2+2] cycloaddition\u2013retroelectrocyclization (CA\u2013RE) between <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010dialkylaniline\u2010substituted alkynes and 7,7,8,8\u2010tetracyanoquinodimethane (TCNQ) is employed to fabricate functional cross\u2010linked polymer films containing the intramolecular charge\u2010transfer (CT) chromophores at the cross\u2010linking points. Polystyrene bearing <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010dialkylaniline\u2010substituted alkynes (<jats:bold>P1<\/jats:bold>) and TCNQ polyester (<jats:bold>P2<\/jats:bold>) are mixed in tetrahydrofuran (THF), then this solution is spray\u2010coated onto an indium tin oxide or glass plate. Heating to 100\u00a0\u00b0C initiates the [2+2] CA\u2010RE reaction, resulting in the formation of cross\u2010linked polymer films. The reaction progress and completion are evaluated by monitoring the CT absorption band and cyano vibration peaks. The resulting cross\u2010linked polymer films show reversible cathodic electrochromism between the neutral and anion radical states. In addition, they also display the visual detection behavior of protic acids and Lewis acids, such as Ag<jats:sup>+<\/jats:sup> ions. Accordingly, the Ag<jats:sup>+<\/jats:sup> ion\u2010loaded polymer films are prepared, and their antibacterial activities are studied. As more Ag<jats:sup>+<\/jats:sup> ions are loaded, the CT band more bathochromically shifts and more potent antibacterial activities are obtained. Therefore, the antibacterial activity of the polymer films can be visually recognized by the film colors. Furthermore, the loaded Ag<jats:sup>+<\/jats:sup> ions can be released from the polymer films by application of an electrochemical potential.<\/jats:p>","DOI":"10.1002\/mabi.201800336","type":"journal-article","created":{"date-parts":[[2018,11,8]],"date-time":"2018-11-08T18:40:06Z","timestamp":1541702406000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Antibacterial Polymeric Films Fabricated by [2+2] Cycloaddition\u2013Retroelectrocyclization and Ag<sup>+<\/sup> Ion Coordination"],"prefix":"10.1002","volume":"18","author":[{"given":"Hiroyuki","family":"Fujita","sequence":"first","affiliation":[{"name":"Department of Organic and Polymeric Materials Tokyo Institute of Technology  2\u201012\u20101 Ookayama Meguro\u2010ku Tokyo 152\u20108552 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nahoko","family":"Nihei","sequence":"additional","affiliation":[{"name":"J\u2010Chemical, Inc.  8\u20101 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