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• Crystal structure data
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• Synthetic procedure for 2, ¹H NMR data of 1–2, mass spectra of 1–2, first-order kinetic plots of the photoisomerization reaction of 1 and 2 induced by 365 nm light at room temperature, molecular structure of II with atom numberings of 1 and 2, the crystal data and structure refinement details for 1 and 2, selected bond lengths (Å) and angles (°), intra- and intermolecular hydrogen bonding geometry in keto form crystal for 1 and 2, crystal packing in unit cell along the c axis for 1 and 2 and the absorption spectra changes under OH^- action; Zn²⁺ action; H⁺ action; OH^- and Zn²⁺ actions; OH^- and H⁺ actions; Zn²⁺ and H⁺ actions; OH^-, Zn²⁺, and H⁺ actions in solution, theoretical calculated details are given
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