A windmill-like Zn3L2 cage exhibiting conformational change imparted sensing for DMA and highly selective naked-eye detection of Co2+ ion by dynamic quenching

作者：Xing, Kai; Fan, Ruiqing^*; Du, Xi; Song, Yang; Chen, Wei; Zhou, Xuesong; Zheng, Xubin; Wang, Ping; Yang, Yulin^*

来源：Sensors and Actuators B: Chemical , 2018, 257: 68-76.

DOI：10.1016/j.snb.2017.10.123

• Zn3L2 metal organic cages
• Single-crystal-to-single-crystal transformations
• DMA sensing
• Drastic conformational change
• Co2+ ion dynamic quenching
• Test paper

A Zn3L2-type metal organic aggregate featuring "six leaf windmill" shaped double cages constructed from a semi-rigid tripodal carboxyl acid ligand H3TCPB (1,3,5-tri(4-carboxyphenoxy) benzene) exhibits sensitive luminescent response toward DMA with obvious intensity enhancement and red-shift. During the procedure, the host-gust interaction was supported by single-crystal-to-single-crystal transformation involving drastic conformational change of the molecular host upon mu(2)-bridging H2O release and the sensing mechanism was also discussed through theoretical calculations from charge separation hypothesis perspective. The DMA post-modified result of crystal transforming reveals high selective and effective naked eye reversible recognition for Co2+ ions through the dynamic and static quenching mechanisms. Moreover, the visual luminescent test paper was realized for potential application in concerns of the biology and environment.

• 出版日期2018-3
• 单位哈尔滨工业大学