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

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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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Xiao, F., Zhang, J., Gan, J., Tang, Y., Cui, Y., Yu, Y., & Qian, G. (2020). Controlled dye release from a metal-organic framework: A new luminescent sensor for water. RSC Advances, 10(5), 2722–2726. https://doi.org/10.1039/c9ra08753b

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