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(A) The interactions of three dimensional chemical structures between i) CPT and PPA-DA, and ii) N-CPT and PPA-DA. The oxygen atoms are red. The carbon atoms are green. The pink imaginary lines represent π–π stacking interactions. (B) Fluorescence emission spectra of PPA-DA & N-CPT complex and PPA-DA & CPT complex. (C) The bond angle of –C20′–O–C– in N-CPT. (D) The bond angle probability of N-CPT between (4-nitrophenyl) formate and CPT.
