Yuming Yang,†,§ Qiang Zhao,‡,§ Wei Feng,† and Fuyou Li*,† †Department of Chemistry and State Key Laboratory of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, P. R. China ‡Key Laboratory for Organic Electronics and Information Displays (KLOEID) and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210046, P. R. China.

Luminescent chemodosimeters for bioimaging.

Design strategies for water-soluble small molecular chromogenic and fluorogenic probes.

Detection Ying Zhou,†,‡ Jun Feng Zhang, and Juyoung Yoon*,† †Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea ‡Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, P. R. China

Fluorescence and colorimetric chemosensors for fluoride-ion detection.

In this review we will explore recent advances in the design and application of excited-state intramolecular proton-transfer (ESIPT) based fluorescent probes. Fluorescence based sensors and imaging agents (probes) are important in biology, physiology, pharmacology, and environmental science for the selective detection of biologically and/or environmentally important species. The development of ESIPT-based fluorescence probes is particularly attractive due to their unique properties, which include a large Stokes shift, environmental sensitivity and potential for ratiometric sensing.

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Excited-state intramolecular proton-transfer (ESIPT) based fluorescence sensors and imaging agents

In the past few decades, the development of optical probes for thiols has attracted great attention because of the biological importance of the thiol-containing molecules such as cysteine (Cys), homocysteine (Hcy), and glutathione (GSH). This tutorial review focuses on various thiol detection methods based on luminescent or colorimetric spectrophotometry published during the period 2010–2012. The discussion covers a diversity of sensing mechanisms such as Michael addition, cyclization with aldehydes, conjugate addition–cyclization, cleavage of sulfonamide and sulfonate esters, thiol–halogen nucleophilic substitution, disulfide exchange, native chemical ligation (NCL), metal complex-displace coordination, and nanomaterial-related and DNA-based chemosensors.

Recent progress in luminescent and colorimetric chemosensors for detection of thiols

http://www.rsc.org/suppdata/cc/c2/c2cc17677g/c2cc17677g.pdf

A new ratiometric ESIPT sensor for detection of palladium species in aqueous solution

We have designed and synthesized a novel ratiometric fluorescent chemodosimeter MHF-based ESIPT process for specific detection of cysteine among the biological thiols. The probe MHF shows very weak blue fluorescence under UV excitation. Upon addition of cysteine (Cys), the reaction of Cys with MHF induces acrylate hydrolysis, thereby enabling the ESIPT process to shift the weak blue emission to a strong green emission with about 20-fold enhancement. We utilized 1H NMR spectra to elucidate the fluorescence sensing mechanism. Moreover, the cellular imaging experiment indicated the MHF possessed excellent selectivity, low cytotoxicity, and desirable cell permeability for biological applications.

http://pubs.acs.org/doi/pdf/10.1021/am500102s

Flavone-Based ESIPT Ratiometric Chemodosimeter for Detection of Cysteine in Living Cells

A series of bishydrazide compounds have been developed for selective turn-on detection of Al3+ cation, based on metal chelation-enhanced fluorescence (CHEF) effects that inhibit the nonradiative PET and ESIPT processes. In aqueous solution, Al3+ selectively induces strong fluorescence of these compounds with large Stokes shifts up to ∼133 nm and emission colors varying from blue to orange. In the solid phase, both Al3+ and Zn2+ give apparent fluorescence which is simultaneously detected based on chromatographic separation.

Novel Turn-On Fluorescent Sensors with Mega Stokes Shifts for Dual Detection of Al3+ and Zn2+

https://www.rsc.org/suppdata/cc/c1/c1cc00034a/c1cc00034a.pdf

A “naked eye” and ratiometric fluorescent chemosensor for rapid detection of F− based on combination of desilylation reaction and excited-state proton transfer

Monitoring of human serum albumin (HSA) in a point-of-care fashion is urgently needed in particular for elderly or chronically ill patients. Herein, a dual-state emissive chalcone probe having the feature of aggregation-induced emission was designed and synthesized. The concentration of HSA can be evaluated by the ratios of emission from probes in aggregated and monomeric state, which gives a visually discernible red-to-green color change. A simple, portable paper-based analytical device have been fabricated by integration of the recognition probe in the detection pad and employed for HSA test using the whole blood samples. This paper-based assay shows the analytical capability comparable to the standard testing methods but is in a point-of-care fashion, providing a promising tool for at-home HSA detection and HSA-related disease diagnosis.

Bin Liu

Papers

A new ratiometric ESIPT sensor for detection of palladium species in aqueous solution

Flavone-Based ESIPT Ratiometric Chemodosimeter for Detection of Cysteine in Living Cells

Novel Turn-On Fluorescent Sensors with Mega Stokes Shifts for Dual Detection of Al3+ and Zn2+

A “naked eye” and ratiometric fluorescent chemosensor for rapid detection of F− based on combination of desilylation reaction and excited-state proton transfer

Paper‐Based Ratiometric Fluorescence Analytical Devices towards Point‐of‐Care Testing of Human Serum Albumin