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Three dimers with biphenylene (dimer <jats:bold>1<\/jats:bold>), phenanthrene (dimer <jats:bold>2<\/jats:bold>), and <jats:italic>m<\/jats:italic>\u2010phenylene (dimer <jats:bold>3<\/jats:bold>) spacers, as well as a fixed\u2010helical dimer <jats:bold>4<\/jats:bold> where two quinolone rings were covalently cross\u2010linked, were designed and prepared. <jats:sup>1<\/jats:sup>H\u2005NMR and ROESY spectra revealed that dimers <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> adopted helical forms in solution, whereas dimer <jats:bold>3<\/jats:bold> did not. The helical conformation of <jats:bold>1<\/jats:bold> was strengthened by addition of either polar or nonpolar solvents to the chloroform solution, which suggested that \u03c0\u2013\u03c0 stacking was the main contributor to the stabilization of the helical structure. All of the dimers, including fixed\u2010helical dimer <jats:bold>4<\/jats:bold>, emitted fluorescence with high quantum yields (<jats:italic>\u03d5<\/jats:italic>=0.79\u20130.86).<\/jats:p>","DOI":"10.1002\/chem.201903538","type":"journal-article","created":{"date-parts":[[2019,9,21]],"date-time":"2019-09-21T02:31:55Z","timestamp":1569033115000},"page":"15765-15771","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Fluorescent Short\u2010Stranded Helical Foldamers Based on L\u2010shaped Dibenzopyrrolo[1,2\u2010<i>a<\/i>][1,8]naphthyridine"],"prefix":"10.1002","volume":"25","author":[{"given":"Kotaro","family":"Tateno","sequence":"first","affiliation":[{"name":"Department of Chemistry Faculty of Science Tokyo University of Science  1\u20133 Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kosuke","family":"Ono","sequence":"additional","affiliation":[{"name":"Department of Chemistry Tokyo Institute of Technology  2\u201312-1 O-okayama, Meguro-ku Tokyo 152-8551 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3367-0153","authenticated-orcid":false,"given":"Hidetoshi","family":"Kawai","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Tokyo University of Science  1\u20133 Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,11,7]]},"reference":[{"key":"e_1_2_6_1_1","unstructured":"Reviews of synthetic helical foldamers:"},{"key":"e_1_2_6_2_2","volume-title":"Foldamers: Structure, Properties, and 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