Singh RChen D.-GWang C.-HLan Y.-CLiu Y.-HChou P.-TCHAO-TSEN CHENPI-TAI CHOU2022-04-252022-04-25202115206106https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117453392&doi=10.1021%2facs.jpcb.1c08133&partnerID=40&md5=136c540410bd45e5540db90ee4f01471https://scholars.lib.ntu.edu.tw/handle/123456789/606854A judicious strategy was utilized to envision the substantial regio-positional effects of substituents on the photophysical properties of the 2H-chromen-2-one-3-benzothiazole scaffold-based push-pull framework, named 6-X-CUMs. Among them, 6-NEt2-CUM reveals prominent excited-state intramolecular charge transfer with a large change of dipole moment (?μ ?18.23 D), hence displaying remarkable emission solvatochromism from the green (536 nm in cyclohexane) to far-red region (714 nm in dimethyl sulfoxide) and a high-temperature sensitivity (-0.23 nm °C-1). These, together with unique basicity and acido-/vaporchromism upon acidification elucidated by NMR and photospectroscopic studies, show stark contrast to the conventional 7-NEt2-CUM. The new series of these tailored 6-X-CUMs represents a new dimension in tailoring the photophysical properties for the development of a promising class of multistimuli-responsive materials. ? 2021 American Chemical Society.Charge transferDimethyl sulfoxideExcited states2h chromen 2 onesBenzothiazolesChromismExcited-state intramolecular charge transfersHigh temperature sensitivityNew dimensionsPhotophysical propertiesPush pullSolvatochromismsStimuli-responsiveScaffoldscoumarin derivativesolventCoumarinsSolvents[SDGs]SDG3journal article10.1021/acs.jpcb.1c08133346338262-s2.0-85117453392