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(a) Schematic of UV- and visible light-induced isomerization, phase transition, and isomeric structures of azobispyrazoles. (b) Structures and Z isomer half-lives of reported azobispyrazoles20 and newly designed 4pzMe-5pzH. (c) Chemical structures of four azobispyrazoles studied in this work, highlighting the phase-directing groups on the identical photochromic core (4pzMe-5pzH), and their phase in each isomeric form.
