title: Luminescent Metal-Organic Framework Sensor: Exceptional Cd2+Turn-On Detection and First In Situ Visualization of Cd2+Ion Diffusion into a Crystal.
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.
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Kwang Soo
authors.initials: KS
authors.lastname: Lim
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: So Yeon
authors.initials: SY
authors.lastname: Jeong
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Dong Won
authors.initials: DW
authors.lastname: Kang
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Jeong Hwa
authors.initials: JH
authors.lastname: Song
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Hyuna
authors.initials: H
authors.lastname: Jo
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Woo Ram
authors.initials: WR
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Won Ju
authors.initials: WJ
authors.lastname: Phang
authors.affiliation: Beamline Division, Pohang Accelerator, Pohang, Kyungbuk, 790-784, Korea.
authors.forename: Dohyun
authors.initials: D
authors.lastname: Moon
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, 136-713, Korea.
authors.forename: Chang Seop
authors.initials: CS
authors.lastname: Hong
keywords: cadmium; diffusion processes; fluorescence; metal-organic frameworks; sensors