We report a new ratiometric fluorescent pH sensor based on postsynthetically modified nanoscale MOF-253. Two types of Eu3+ with different characteristic excitation wavelength are realized in MOF-253 by a postsynthetic method (PSM). The pH sensor requires no calibration because only one of the two types of Eu3+ is affected by the pH variation.
Y. Lu and B. Yan, Chem. Commun., 2014, 50, 13323 DOI: 10.1039/C4CC05508J
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