{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T11:06:54Z","timestamp":1785409614739,"version":"3.56.0"},"reference-count":39,"publisher":"Beilstein Institut","license":[{"start":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T00:00:00Z","timestamp":1769990400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T00:00:00Z","timestamp":1769990400000},"content-version":"am","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T00:00:00Z","timestamp":1769990400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Beilstein J. Org. Chem."],"accepted":{"date-parts":[[2026,1,19]]},"abstract":"<jats:p>\n                    A twisted D\u2013\u03c0\u2013A molecule, PI-Cz\n                    <jats:bold>1<\/jats:bold>\n                    , was designed and synthesized using phthalimide as the acceptor, carbazole as the donor, and a phenylene bridge. Single-crystal X-ray diffraction revealed a markedly non-coplanar skeleton. Calculations based on the crystallographic geometry and frontier-orbital analysis indicate that the HOMO and LUMO are localized on the carbazole and phthalimide fragments, respectively, affording a small singlet\u2013triplet energy gap. In the solid state, compound\n                    <jats:bold>1<\/jats:bold>\n                    exhibits pronounced phase dependence: powder samples display room-temperature delayed emission with principal bands at 550\/600 nm and a lifetime of \u22480.39 s that undergoes strong thermal quenching, diagnostic of room-temperature phosphorescence. In contrast, amorphous films show no RTP; their delayed component grows with temperature and shares the same peak position as the prompt emission, consistent with thermally activated delayed fluorescence (TADF). Correlating temperature-dependent lifetimes with phase characterization indicate that, in amorphous environments lacking ordered \u03c0\u2013\u03c0 stacking and rigid confinement, the small \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    promotes reverse intersystem crossing, yielding delayed fluorescence; whereas in powder states, intermolecular interactions enhance spin\u2013orbit coupling and crystallinity suppresses nonradiative decay, thereby activating RTP. This work achieves an integrated \u201ccrystalline-state RTP\u2013amorphous-state TADF\u201d regulation within a single molecule.\n                  <\/jats:p>","DOI":"10.3762\/bjoc.22.16","type":"journal-article","created":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T12:43:14Z","timestamp":1770036194000},"page":"224-236","source":"Crossref","is-referenced-by-count":0,"title":["Configuration\u2013packing synergy enabling integrated crystalline-state RTP and amorphous-state 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