In this paper, a new Th 4+ ion-selective chromogenic sensor (L) was developed by reacting 1,10phenanthroline-2,9-dicarbohydrazide with 2-hydroxy naphthaldehyde. The sensing ability of L toward Th 4+ was investigated in solution and paper strips loaded with L using spectrophotometric and colorimetric methods. The selective interaction of L was examined with various f-metal ions and other selected metal ions from s-block and d-block elements. Results show that by the colorimetric method in solutionphase dimethyl sulfoxide/H 2 O (7:3, v/v) and paper strip methods, the naked-eye detectable color change of L occurred from colorless solution to yellow-orange and pale yellow colour upon interacting with Th 4+ and Al 3+ , respectively, whereas other metal ions did not interfere. The ligand L exhibits two absorbance bands at 320 and 375 nm because of ligand-toligand charge transfer. Upon interaction with Th 4+ , L undergoes red shift of both absorption bands and the formation of a new UV−vis band at 335 and 440 nm. The UV−visible spectral studies indicate the formation of a 1:1 host−guest complex between L and Th 4+ with an association constant of 4.7 × 10 3 M −1 . The limit of quantification and limit of detection of L for the analysis of Th 4+ are found to be 167 and 50 nM, respectively. The visually detectable color change of L has been well integrated with a smartphone RGB color value to make it an analytical signal for real-time analysis of Th 4+ with the detection limit down to 116 nM. Besides, L was applied for the analysis of Th 4+ content present in various real water samples, monazite, and lantern mantle samples by spectrophotometry and RGB color values. The binding mode of L with Th 4+ is investigated by 1 H NMR, electrospray ionization-mass, and theoretical studies.

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In recent years, Ru(II) complexes have high importance in medicinal chemistry due to their significant anti-cancer activities which are directly related to DNA binding ability. In this report, chemistry and...

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A simple and reliable colorimetric probe N,N'-Bis-(4-diethylamino-2-hydroxybenzylidene)-1,10-phenanthroline-2,9-carbohydrazide (L) has been synthesised by reacting 4-(diethylamino) salicylaldehyde with 1,10-phenanthroline-2,9-dicarbohydrazide. Sensing ability of L was studied by interacting with various f-block metal ions...