Luminescent Metal–Organic Framework Sensor: Exceptional Cd2+ Turn‐On Detection and First In Situ Visualization of Cd2+ Ion Diffusion into a Crystal. Issue 20 (30th January 2017)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Chemistry. Volume 23:Issue 20(2017)
• Page Start: 4803
• Page End: 4809
• Publication Date: 2017-01-30
• Subjects: cadmium -- diffusion processes -- fluorescence -- metal–organic frameworks -- sensors; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201604252
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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. Abstract : Pick and choose : A metal–organic framework (MOF) chemosensor serves as an efficient platform for the selective detection of Cu 2+ and Cd 2+ ions over other metal ions. 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 (see figure).