A quinoline-indene derivative is described as a new highly selective and sensitive chromogenic and turn-on fluorogenic probe for the naked-eye detection of copper(II) cation in water-acetonitrile 1:1 mixture.

Keywords: Sulfur-nitrogen heterocycles / Materials science / Liquid crystals / Radicals / Fused-ring systems 3-Amino-1H-indene-2-carbonitrile and 2-amino-3H-indene-1-carbonitrile reacted with SCl 2 , iBu 3 N and NCS to give benzocyclopenta[1,2,6]thiadiazines, and whilst 2-aminocyclopent-1-enecarbonitrile gave, under the same conditions, a cyclopenta[1,2,6]thiadiazine, its reaction with mixtures of S 2 Cl 2 , SCl 2 and iBu 3 N under different conditions gave, selectively, an isothiazolo [3,4-d]

Indene and cyclopentene enaminonitriles were reacted with SCl2, iBu3N and NCS to give the first cyclopenta[1,2,6]thiadiazines that showed unusual characteristics, one as a NIR dye and another as a liquid crystal.

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