A highly sensitive turn-on ratiometric luminescent probe based on postsynthetic modification of Tb3+@Cu-MOF for H2S detection

作者：Zheng, Xubin; Fan, Ruiqing^*; Song, Yang; Wang, Ani; Xing, Kai; Du, Xi; Wang, Ping; Yang, Yulin^*

来源：Journal of Materials Chemistry C, 2017, 5(38): 9943-9951.

DOI：10.1039/c7tc02430d

• METAL-ORGANIC FRAMEWORK
• WHITE-LIGHT EMISSION
• HYDROGEN-SULFIDE
• FLUORESCENT-PROBE
• LIVING CELLS
• PORE SURFACE
• COLON-CANCER
• COMPLEXES
• IONS
• SOLVENT

The fabrication of luminescent materials with lanthanide cations encapsulated within MOF pores is currently of interest because luminescent materials are used in numerous applications. In this study, a distinctive strategy via postsynthetic modification (PSM) of a novel metal-organic framework [Cu(HCPOC)(2)](n)(Cu1) (H2CPOC = 5-(40-carboxyphenoxy) nicotinic acid) and terbium ions (Tb3+) for sensing hydrogen sulfide (H2S) is reported. The obtained composite Tb3+@ Cu1 emits a weak typical Tb3+ ion emission and strong ligand-centred emission. Interestingly, H2S, as a strong electron donor, can strongly enhance the luminescence of Tb-3+ through its superior affinity for Cu2+ ions. The composite Tb3+@Cu1 was designed as a luminescent turn-on ratiometric probe for H2S detection, showing high sensitivity and selectivity. The detection limit of Tb3+@Cu1 (1.20 mM) is far below that of Cu1 (13.25 mM). Moreover, a similar ligand, 5-(40-carboxyphenyl) nicotinic acid (H2CPC), was used to synthesize a fascinating structure, [Cu-5(CPC)(2)(HCPC)(2)(OH-)(4)](n) (Cu2), which was quite similar to that of the famous semiconductor MoS2, with the advantageous support of an organic linker between layers, and it showed a band gap of 2.45 eV.

• 出版日期2017-10-14
• 单位哈尔滨工业大学