• RAHUL SHRIVASTAVA

      Articles written in Journal of Chemical Sciences

    • 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

      SUMAN SWAMI ARUNAVA AGARWALA BABITA MALIK RAHUL SHRIVASTAVA

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      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.

    • Poly (ethylene glycol)-400 crowned silver nanoparticles: a rapid, efficient, selective, colorimetric nano-sensor for fluoride sensing in an aqueous medium

      SUMAN SWAMI ARUNAVA AGARWALA VIBHA SHRIVASTAVA RAHUL SHRIVASTAVA

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      Development of rapid and effective analytical sensing strategy for fluoride ion in aqueousmedium is an utmost need in view of naturally widely spread fluoride contaminated groundwater or drinkingwater which causes numerous adverse effects on human health. In prospect of the need, we have developed asimple synthetic route for poly(ethylene glycol)-400 crowned silver nanoparticles for sensitive sensing offluoride ions in aqueous medium. The silver nanoparticles embedded with polyethylene glycol-400 (PEG-400) were synthesized as colloids by heating an aqueous solution of silver nitrate and PEG-400 with trisodiumcitrate. The effects of temperature, the concentration of silver nitrate and trisodium citrate werethoroughly investigated and optimized. The structure and morphology of prepared poly(ethylene glycol)-400crowned silver nanoparticles as colloids was thoroughly examined by UV–visible spectroscopy, Fouriertransform infrared (FTIR) and field emission scanning electron microscopy (FESEM). The prepared poly(-ethylene glycol)-400 crowned Ag Nps selectively detects fluoride ion in an aqueous medium at low concentration(0.098 mg/L) via the change in optical properties. The change in optical properties of Ag Nps wasinvestigated with UV-visible and morphological changes were examined with field emission scanningelectron microscope. The FESEM and UV-Visible analysis demonstrate that synthesized Ag nanoparticles areagglomerates with fluoride ions with immediate visual color change from yellow to colorless.

      * Polyethylene glycol crowned silver nanoparticles have designed and synthesized for selective fluoride sensing in aqueous medium. * Sensing occurrences explained with FSEM and UV-Visible spectroscopic techniques *NPs exhibits good limit of detection 0.0016 mg/L that is less than desirable limit 0.05 mg/L

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