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Highly Water-Stable Dye@Ln-MOFs for Sensitive and Selective Detection toward Antibiotics in Water

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journal contribution
posted on 2019-05-22, 00:00 authored by Mingke Yu, Ying Xie, Xinyu Wang, Yuxin Li, Guangming Li
The host–guest composite, RhB@Tb-dcpcpt, is synthesized by trapping rhodamine B (RhB) into the channels of [Me2NH2]­[Tb3(dcpcpt)3(HCOO)]·DMF·15H2O (Tb-dcpcpt, DMF = N,N'-dimethylformamide) via an ion-exchange process. The photophysical property of RhB@Tb-dcpcpt exhibits stable columinescence of RhB and Tb3+ ions in the whole excitation range of 300–390 nm, realizing an excitation-wavelength-independent yellow light emission. Powder X-ray diffraction and photoluminescence analysis illustrate the outstanding stabilities of RhB@Tb-dcpcpt on structural and photophysical properties in water medium. Subsequently, a bifunctional sensing process toward antibiotics is designed in terms of luminescent intensity and color. As a result, RhB@Tb-dcpcpt could realize sensitive and selective detection toward nitrofuran antibiotics (nitrofurazone and nitrofurantoin) via  luminescent quenching process and toward quinolone antibiotics (ciprofloxacin and norfloxacin) via luminescent color-changing process. Systematic analysis on the sensing mechanism reveals that photoinduced electron transfer and inner filter effect contribute to the realization of the sensing process.

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