Preparation, single-crystal structure and room-temperature phosphorescence of a covalent organic polymer containing Te–O–P bonds

作者：Miaomiao Xue, Guigui Ye, Lei Zhang, Qiang Dong, Chun‐Sing Lee, Zhen Li, Qichun Zhang · 发表于：Chemical Science · 年份：2025 · DOI：10.1039/d4sc07210c · 被引用次数：5 · 研究领域：Luminescence and Fluorescent Materials、Covalent Organic Framework Applications、Molecular Sensors and Ion Detection

H] units. Due to the existence of one unreacted OH group in each phosphonic acid unit, multiple hydrogen-bonding interactions can be formed between adjacent polymer chains, which stabilizes the structure and promotes CityU-21 to form a pseudo-two-dimensional framework. Benefiting from the integrated effect of aromatic P[double bond, length as m-dash]O parts, the heavy atoms (tellurium), and multiple hydrogen bonds, single crystals of CityU-21 display RTP behavior with a lifetime of 179 ms @ 540 nm and 158 ms @ 565 nm, a photoluminescence quantum yield of 84.69% and an afterglow time of 1.2 s. Moreover, CityU-21 can maintain its crystallinity and RTP character with an afterglow time of up to 0.8 s after immersion in different solvents for 60 hours, which can address the issue that most single crystals of RTP small molecules lose their crystallinity and RTP properties after solvent treatment.