A new fluorescence sensor has been synthesized for its selective recognition of As3+ (11.53 nM), Nd3+ (0.65 nM) and Br− (11.25 nM).

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In this article, for the first time, we have reported a novel CHEF-PET fluorescence sensor L based on calix[4]arene containing four pyrene groups as binding sites, which is highly selective and sensitive towards Zn2+, Hg2+ and I−.

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The title compound, C19H19ClO5, is a chloro derivative of a biologically significant chalcone family. The mean plane of the two substituted benzene rings are twisted by 55.33 (8)° with respect to each other. An intra­molecular C—H⋯Cl hydrogen bond generates an S(5) graph-set motif. In the crystal, a bifurcated O—H⋯(O,O) hydrogen bond leads to an R 1 2(5) graph-set motif and to the formation of zigzag chains propagating along the c-axis direction. A weak π–π inter­action involving the methyl­phenyl rings [centroid–centroid distance = 3.8185 (10) Å] and C—H⋯π inter­actions also occur.

Key indicators: single-crystal X-ray study; T = 273 K; mean (C-C) = 0.005 Å; R factor = 0.070; wR factor = 0.246; data-to-parameter ratio = 12.8.In the title compound, C 28 H 24 F 6 N 2 O 3 , the mean plane of the central pyrazoline ring forms dihedral angles of 2.08 (9) and 69.02 (16) with the 2-benzyloxy-6-hydroxy-4-methylphenyl and 3,5-bis(trifluoromethyl)phenyl rings, respectively. The dihedral angle between the mean planes of the pyrazoline and 3,5-bis(trifluoromethyl)phenyl rings is 68.97 (9) . An intramolecular O-HÁ Á ÁN hydrogen bond is observed, which forms an S(6) graph-set motif. In the crystal, pairs of weak C-HÁ Á ÁF halogen interactions link the molecules into inversion dimers while molecular chains along [100] are formed by C-HÁ Á ÁO contacts. Related literature