Chen Z.-JLu H.-FChao IJYE-SHANE YANG2022-12-142022-12-14202200223263https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127671683&doi=10.1021%2facs.joc.2c00140&partnerID=40&md5=3161570a7ca5499ed64a284b9454b353https://scholars.lib.ntu.edu.tw/handle/123456789/626203The interplay between the thermal helical inversion (THI) of the stiff-stilbene moiety and the rotation of the dimethylamino (DMA) group in 1 results in a dependence of the DMA NMR signals on the THI kinetics in (E)-1 but the rotation kinetics in (Z)-1, because the faster motion mode is responsible. Consequently, the photochemical switching from (E)-1 to (Z)-1 illustrates the phenomenon of "switchable motion detection"by the same set of NMR signals in a dual-motion molecular system. © 2022 American Chemical Society.[SDGs]SDG3journal article10.1021/acs.joc.2c001402-s2.0-85127671683