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Luminescent Metal–Organic Framework Sensor: Exceptional Cd 2+ Turn‐On Detection and First In Situ Visualization of Cd 2+ Ion Diffusion into a Crystal
Author(s) -
Lim Kwang Soo,
Jeong So Yeon,
Kang Dong Won,
Song Jeong Hwa,
Jo Hyuna,
Lee Woo Ram,
Phang Won Ju,
Moon Dohyun,
Hong Chang Seop
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604252
Subject(s) - luminescence , fluorescence , metal organic framework , ion , quenching (fluorescence) , metal ions in aqueous solution , metal , chemistry , diffusion , materials science , analytical chemistry (journal) , single crystal , inorganic chemistry , photochemistry , crystallography , optoelectronics , optics , physics , organic chemistry , adsorption , thermodynamics
With regard to fluorescence quenching commonly observed during metal‐ion detection, “turn‐on” chemical sensing has been rarely reported, but could be extremely important because it facilitates the selective recognition of target objects of interest against a dark background. A metal–organic framework (MOF) chemosensor has been prepared that serves as an efficient platform for the selective detection of Cu 2+ and Cd 2+ ions over other metal ions. In particular, this framework shows the highest fluorescence enhancement (≈60‐fold relative to Cd‐free MOF) for the hazardous metal ion Cd 2+ among luminescent MOFs and displays excellent reusability in repeated cycles. The direct diffusion of Cd 2+ into the crystal pores has also been visualized for the first time.