An AIE-based fluorescent dye for selective staining of polyamide microplastics without pretreatment: Applications to environmental samples and zebrafish.

A novel staining dye, BEM ((1E,1'E)-1,1'-([2,2'-bithiophene]-5,5'-diyl)bis(N-(9-ethyl-9H-carbazol-3-yl)methanimine)) was synthesized for selective identification of polyamide (PA) micrplastics. BEM showed unique photophysical properties such as solvatochromism, intramolecular charge transfer (ICT), and aggregation induced emission (AIE) which were demonstrated through spectroscopic analysis and density functional theory (DFT) calculations. The optimal staining conditions for selective staining of PA by BEM were established by evaluating the staining efficiency according to the variation of the solvent compositions, concentrations of BEM, and staining durations.

Selective visual staining of polyurethane microplastics by novel colorimetric and near-infrared (NIR) fluorescent dye: Application to environmental water and natural soil samples.

Microplastics can cause environmental pollution and ecosystem destruction as well as human health problems. Among the types of microplastics, polyurethane (PU) is particularly resistant to heat and difficult to decompose, causing disposal problems, and is evaluated as one of the most hazardous polymers. We present a novel colorimetric and near-infrared (NIR) fluorescence dye, (E)-N-(2-((4-(diphenylamino)benzylidene)amino)phenyl)- 7-nitrobenzo[c][1,2,5]oxadiazol-4-amine (DPNA), designed for selective visual PU microplastic staining.

An Acylhydrazone-Based Fluorescent Sensor for Sequential Recognition of Al and HPO.

A novel acylhydrazone-based fluorescent sensor was designed and synthesized for consecutive sensing of Al and HPO. displayed fluorometric sensing to Al and could sequentially detect HPO by fluorescence quenching. The limits of detection for Al and HPO were determined to be 0.

An Indole-Based Fluorescent Chemosensor for Detecting Zn in Aqueous Media and Zebrafish.

An indole-based fluorescent chemosensor was synthesized to detect Zn. displayed a marked fluorescence increment with Zn. The detection limit (0.

A naphthyl thiourea-based effective chemosensor for fluorescence detection of Ag and Zn.

A naphthyl thiourea-based effective chemosensor HNC, (E)-2-(2-hydroxy-3-methoxybenzylidene)-N-(naphthalen-1-yl)hydrazine-1-carbothioamide, was synthesized. HNC showed quick responses toward Ag and Zn through marked fluorescence turn-on in different solvent conditions, respectively. Binding proportions of HNC to Ag and Zn were found to be 2:1 and 1:1, respectively.

A Highly Selective Fluorescent Chemosensor for Detecting Indium(III) with a Low Detection Limit and its Application.

A highly selective chemosensor BHC ((E)-N-benzhydryl-2-((2-hydroxynaphthalen-1-yl)methylene)hydrazine-1-carbothioamide) for detecting indium(III) was synthesized. Sensor BHC can detect In(III) by a fluorescence turn-on method. The detection limit was analyzed to be 0.

A Multi-Responsive Naphthalimide-Based "Turn-on" Fluorescent Chemosensor for Sensitive Detection of Trivalent Cations Ga, Al and Cr.

A new multifunctional chemosensor 1, (E)-2-(((2-hydroxynaphthalen-1-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphtalimide and naphthaldehyde was developed, which showed the fluorescence responses to trivalent metal ions (Ga, Al and Cr). Sensor 1 detected and differentiated selectively trivalent metal ions Ga, Al and Cr by fluorescence enhancement at different emissions. The association constant of Ga-2∙1 complex is the highest one among those of the organic chemosensors reported, to date.