Ferrocene containing N-tosyl hydrazones as optical and electrochemical sensors for Hg2+, Cu2+ and F− ions

The crystal structure of (E)-2-(5-bromo-2-hydroxybenzylidene)-N-phenylhydrazine-1- carboxamide monohydrate, C14H14BrN3O3

C14H14BrN3O3, orthorhombic, Pca21 (no. 29), a = 32.932(3) Å, b = 5.8490(7) Å, c = 7.3606(8) Å, V = 1417.8(3) Å3, Z = 4, R gt (F) = 0.0260, wR ref (F 2) = 0.0553, T = 150 K.

The crystal structure of (E)-2-(2-((2-picolinoylhydrazono)methyl)phenoxy)acetic acid dihydrate, C15H17N3O6

C15H17N3O6, triclinic, P 1 ‾ $P‾{1}$ (no. 2), a = 7.2155(8) Å, b = 10.7519(8) Å, c = 10.8562(8) Å, α = 107.910(7), β = 97.087(8), γ = 100.409(7) V = 773.69(12) Å3, Z = 2, R gt (F) = 0.0500, wR ref (F 2) = 0.1238, T = 150(1) K.

Triazole derived azo-azomethine dye as a new colorimetric anion chemosensor

In the pursue of developing anion sensors, an efficient triazole derived azo-azomethine dye chemosensor (S) that differentially senses F‾ and AcO‾ ions has been reported. The ions recognition ability of S was investigated by colorimetric and UV-visible spectroscopic methods. Interestingly, this chemosensor molecule is virtually inactive in presence of other anions such as Cl‾, Br‾ and I‾ and HSO₄‾. We have further presented a ratiometric approach to differentiate F‾ and AcO‾ ions. The reversibility of F‾ ion binding with S was established by the addition of Ca(NO₃)₂ to the fluoride bound S, which led to the regeneration of S. The quantum chemical calculation of energies of unbound and bound S has been employed using Density Functional Theory (DFT) to understand the interaction between chemosensor and anions. Evidence in support of fluoride-induced deprotonation of a O-H bond during the detection of F⁻ ion has been demonstrated by employing ¹H NMR titration experiments.