Luminescent Metal–Organic Framework Sensor: Exceptional Cd2+ Turn-On Detection and First In Situ Visualization of Cd2+ Ion Diffusion into a Crystal

Kwang Soo Lim, So Yeon Jeong, Dong Won Kang, Jeong Hwa Song, Hyuna Jo, Woo Ram Lee, Won Ju Phang, Dohyun Moon, Chang Seop Hong

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

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 Cu2+ and Cd2+ 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 Cd2+ among luminescent MOFs and displays excellent reusability in repeated cycles. The direct diffusion of Cd2+ into the crystal pores has also been visualized for the first time.

Original languageEnglish
Pages (from-to)4803-4809
Number of pages7
JournalChemistry - A European Journal
Volume23
Issue number20
DOIs
Publication statusPublished - 2017 Apr 6

Keywords

  • cadmium
  • diffusion processes
  • fluorescence
  • metal–organic frameworks
  • sensors

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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