Controlled dye release from a metal–organic framework: a new luminescent sensor for water

Fan Xiao; Jun Zhang; Jiulin Gan; Ying Tang; Yuanjing Cui; Yang Yu; Guodong Qian

doi:10.1039/C9RA08753B

Controlled dye release from a metal–organic framework: a new luminescent sensor for water†

Fan Xiao,^a Jun Zhang,^a Jiulin Gan,

^b Ying Tang,^a Yuanjing Cui,

*^a Yang Yu

^a and Guodong Qian

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China
E-mail: cuiyj@zju.edu.cn, gdqian@zju.edu.cn

^b State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China

Abstract

By introducing the dye Rhodamine 6G (R6G) into a metal–organic framework (MOF), Mn-sdc-2 (H₂sdc = 4,4′-stilbenedicarboxylic acid), with a pore size of 20 × 9.8 Å², the composite R6G@Mn-sdc-2 was obtained. Subsequently, the MOF Mn-sdc-1 with a smaller pore size of 7.5 × 7.5 Å² can be formed through a single-crystal to single-crystal transformation from Mn-sdc-2, thus tightly locking the dye R6G within the pores. Compared with R6G@Mn-sdc-2, R6G@Mn-sdc-1 exhibits a stronger fluorescence emission of R6G. Because the MOF Mn-sdc-1 can reversibly transform back to Mn-sdc-2 in the presence of trace water, the dye R6G can be released. This enables R6G@Mn-sdc-1 to be used as a new luminescent sensor for trace water in organic solvents by monitoring the fluorescence intensity of released R6G. The limit of detection can reach 0.035% in ethanol (v : v), which is among the most sensitive fluorescent water probes.

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DOI: https://doi.org/10.1039/C9RA08753B
Article type: Paper
Submitted: 21 Oct 2019
Accepted: 30 Dec 2019
First published: 15 Jan 2020
This article is Open Access

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RSC Adv., 2020,10, 2722-2726

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Controlled dye release from a metal–organic framework: a new luminescent sensor for water

F. Xiao, J. Zhang, J. Gan, Y. Tang, Y. Cui, Y. Yu and G. Qian, RSC Adv., 2020, 10, 2722 DOI: 10.1039/C9RA08753B

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Controlled dye release from a metal–organic framework: a new luminescent sensor for water†

Abstract

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Controlled dye release from a metal–organic framework: a new luminescent sensor for water

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