Deprotonation-Triggered Stokes Shift Fluorescence of an Unexpected Basic-Stable Metal−Organic Framework

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Zhao, Nian
Sun, Fuxing
Zhang, Shixing
He, Hongming
Liu, Jia
Li, Qin
Zhu, Guangshan
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2015
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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.

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Inorganic Chemistry
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54
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1
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Inorganic chemistry
Inorganic chemistry not elsewhere classified
Physical chemistry
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