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A new family of phosphine-free Amino-chroman-4-one ((Z)-2ethoxy-3-((phenylamino)methylene)chroman-4-one) bidentate ligands ware successfully synthesised and characterised. The bidentate ligand act as efficient catalyst with combination of Pd (II) salt in the CÀ C bond formation and exhibited excellent performance in the Suzuki-Miyaura and Mizoroki-Heck coupling reaction. A broad range of substrates, including heterocyclic, flavones, Isatin and sterically hindered coupling partner, were well tolerated under the optimized reaction conditions. Metal complex and all the intermediates were formed in the catalytic cycle were characterized by mass spectrometry to support the reaction mechanism.

Exposure to even very low concentrations of Pb is known to cause cardiovascular, neurological, developmental, and reproductive disorders, and affects children in particular more severely. Consequently, much effort has been dedicated to the development of colorimetric and fluorescent sensors that can selectively detect Pb ions. Here, we describe the development of a triazole-based fluorescent sensor L5 for Pb ion detection. The fluorescence intensity of chemosensor L5 was selectively quenched by Pb ions and a clear color change from colorless to yellow could be observed by the naked eye. Chemosensor L5 exhibited high sensitivity and selectivity towards Pb ions in phosphate-buffered solution [20 mM, 1:9 DMSO/H O (v/v), pH 8.0] with a 1:1 binding stoichiometry, a detection limit of 1.9 nM and a 6.76 × 10 M binding constant. Additionally, low-cost and easy-to-prepare test strips impregnated with chemosensor L5 were also produced for efficient of Pb detection and proved the practical use of this test.

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