Hydrogen‐Bonded Organic Aromatic Frameworks for Ultralong Phosphorescence by Intralayer π–π Interactions. Issue 15 (7th March 2018)

• Record Type: Journal Article
• Authors: Cai, Suzhi; Shi, Huifang; Zhang, Zaiyong; Wang, Xuan; Ma, Huili; Gan, Nan; Wu, Qi; Cheng, Zhichao; Ling, Kun; Gu, Mingxing; Ma, Chaoqun; Gu, Long; An, Zhongfu; Huang, Wei
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 15(2018)
• Page Start: 4005
• Page End: 4009
• Publication Date: 2018-03-07
• Subjects: hydrogen bonds -- hydrogen-bonded organic frameworks -- π interactions -- self-assembly -- ultralong organic phosphorescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201800697
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Ultralong organic phosphorescence (UOP) based on metal‐free porous materials is rarely reported owing to rapid nonradiative transition under ambient conditions. In this study, hydrogen‐bonded organic aromatic frameworks (HOAFs) with different pore sizes were constructed through strong intralayer π–π interactions to enable ultralong phosphorescence in metal‐free porous materials under ambient conditions for the first time. Impressively, yellow UOP with a lifetime of 79.8 ms observed for PhTCz‐1 lasted for several seconds upon ceasing the excitation. For PhTCz‐2 and PhTCz‐3, on account of oxygen‐dependent phosphorescence quenching, UOP could only be visualized in N2, thus demonstrating the potential of phosphorescent porous materials for oxygen sensing. This result not only outlines a principle for the design of new HOFs with high thermal stability, but also expands the scope of metal‐free luminescent materials with the property of UOP. Abstract : A healthy glow : Ultralong phosphorescence was observed from hydrogen‐bonded organic aromatic frameworks (HOAFs) with different pore sizes that were constructed under different conditions from the same aromatic precursor containing three carbazole units. Intralayer π–π interactions and interlayer hydrogen bonds endowed the HOAFs with high thermal stability and phosphorescence lifetimes of up to 79.8 ms (see picture).