A new class of efficient 4-[(nitro substituted-phenyl)-hydrazonomethyl]- 1-phenyl-1H-pyrazole-3-carboxylate derived colorimetric chemosensor for selective sensing of fluoride and other biologically important anions
A new class of efficient colorimetric chemosensors derived from 4-[(nitro substituted-phenyl)-hydrazonomethyl]-1-phenyl-1H-pyrazole-3-carboxylate have been synthesized and characterized. The synthesized receptors exhibit instant color change from yellow to dark purple along with significant bathochromicshifts when interacted with fluoride ions. The UV-Visible and ¹H NMR titration experiments revealed that 4-[(4-nitro-phenyl)-hydrazonomethyl]-1-phenyl-1H-pyrazole-3-carboxylate derivatives showed selective sensing of fluoride ions in preference to Cl⁻, Br⁻, I⁻, PF⁻⁻, HSO₄⁻, ClO₄⁻ , CH₃COO⁻ and H₂PO₄⁻ ions while 4-[2,4-dinitro-phenyl)-hydrazonomethyl]-1-phenyl-1H-pyrazole-3-carboxylate derivatives showed sensing of acetate, dihydrogen phosphate ion and fluoride ion in organic media.
Volume 134, 2022
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