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A colorimetric and fluorescent dual-channel chemosensor (G1) with a simple structure was designed and synthesized to identify [Hg.sup.2+] in an aqueous solution with high selectivity and sensitivity. After adding [Hg.sup.2+], the color of G1 in the dimethyl sulfoxide (DMSO)/[H.sub.2]O (2:8, v/v) solution changed from colorless to a distinct rose red, whereas the fluorescence changed from colorless to bright orange under ultraviolet (UV) light. The detection limit on the fluorescence response of G1 to [Hg.sup.2+] was as low as 6.09 * [10.sup.-7] mol/L. The results of the Job's plot suggested that the combined stoichiometry between G1 and [Hg.sup.2+] was 1:1. By successively adding [Hg.sup.2+] and ethylenediaminetetraacetic acid (EDTA), the fluorescence process can be reversed and almost no fluorescence loss. In addition, G1-based test strips were produced and were able to qualitatively detect [Hg.sup.2+] in tap water., With the development of science and technology, mercury (Hg) is widely used in medical, military, and electrical applications (1-3). [Hg.sup.2+] is easily accumulated in the human body, and its great [...]

A novel hydrazone-based cyanide (C[N.sup.-]) fluorescent probe, HNT, was synthesized by 1-hydrazine methyl-2-naphthol and 2,3,4-trihydroxybenzaldehyde. C[N.sup.-] has stronger basicity and a superior hydrogen-bonding ability than other anions. Therefore, C[N.sup.-] can [...]

In the title compound, C(17)H(17)ClN(2)O(3)S, the central carbonyl-thio-urea unit is nearly planar [maximum atomic deviation = 0.019 (3) Å] and makes dihedral angles of 2.47 (7) and 17.76 (6)° with the terminal benzene rings. An intra-molecular N-H⋯O hydrogen bond occurs. Weak inter-molecular C-H⋯S and C-H⋯Cl hydrogen bonding is observed in the crystal structure.