Deprotonation-triggered Stokes shift fluorescence of an unexpected basic-stable metal-organic framework

Nian Zhao; Fuxing Sun; Shixing Zhang; Hongming He; Jia Liu; Qin Li; Guangshan Zhu

doi:10.1021/ic501560z

Deprotonation-triggered Stokes shift fluorescence of an unexpected basic-stable metal-organic framework

Inorg Chem. 2015 Jan 5;54(1):65-8. doi: 10.1021/ic501560z. Epub 2014 Dec 9.

Authors

Nian Zhao¹, Fuxing Sun, Shixing Zhang, Hongming He, Jia Liu, Qin Li, Guangshan Zhu

Affiliation

¹ State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry and ‡Department of Chemistry, Jilin University , Changchun 130012, China.

PMID: 25490257
DOI: 10.1021/ic501560z

Abstract

A new three-dimensional porous metal-organic framework, JUC-119, constructed by a pyrene-based dendritic organic linker, H8TIAPy (H8TIAPy = 1,3,6,8-tetrakis(3,5-isophthalic acid)pyrene), and Eu(III) has been synthesized successfully. JUC-119 shows unexpected stability under a wide range of basic conditions from 0 to 0.01 M NaOH. Furthermore, with two carboxyl groups uncoordinated in each ligand, the crystals of JUC-119 show deprotonation-triggered Stokes shift fluorescence under basic conditions. As the concentration of base increases from 0 to 0.01 M NaOH, the luminescence emission of JUC-119 becomes gradually red shifted from 455 to 485 nm. In addition, the Stokes shift shows a good linear relationship to -log[OH(-)], which makes JUC-119 promising for base sensing.