Two Calix[3]Phenothiazine‐Based Amorphous Pure Organic Room‐Temperature Phosphorescent Supramolecules Mediated by Guest
Yonghui Sun, Linnan Jiang, Lijuan Liu, Yong Chen, Wenwen Xu, Jie Niu, Yue‐Xiu Qin, Xiufang Xu, Yu Liu
Abstract
Abstract Herein, two kinds of amorphous solid‐state supramolecular systems with purely organic room temperature phosphorescence (RTP) from calix[3]phenothiazine ( C[3]Pz ) activated by 1,2‐/1,3‐dicyanobenzene ( 1,2‐/1,3‐DCB ) are reported. Different from macrocycle‐confined guest phosphorescence emission, RTP of these two amorphous solid‐state supramolecular systems is entirely from the 1,2‐/1,3‐DCB rivets C[3]Pz cavity to form dense supramolecular complex through CH … π interactions, leading to two different phosphorescence emissions at 566/524 nm under 430 nm excitation, respectively. Although C[3]Pz shows a regular arrangement in the crystal, the vibration dissipation of the benzene ring results in C[3]Pz emitting only fluorescence at 508 nm at room temperature. 1,2‐DCB and 1,3‐DCB can act as molecular rivets to fix the C[3]Pz to inhibit molecular vibration so as to reduce nonradiative relaxation, which enables C[3]Pz to achieve effective RTP emission with 20.8–36.8% quantum yields. This kind of guest‐activated host RTP, which is fairly rare in supramolecular systems, is successfully used for color QR codes and information encryption.