• GAURI DEVI BAJJU

      Articles written in Journal of Chemical Sciences

    • Axially coordinated tin porphyrins anchored graphene oxide hybrid composites as productive catalyst for catalytic conversion of 4-nitrophenol to 4-aminophenol

      REHANA YASMEEN RICHA SINGHAAL GAURI DEVI BAJJU HAQ NAWAZ SHEIKH

      More Details Abstract Fulltext PDF

      Axially ligated tin porphyrins were synthesized by proceeding through the preparation of freebase and metal incorporated porphyrins. Axially ligated tin porphyrins were anchored with graphene oxide via amide linkage among the carboxylic functional moieties of graphene oxide (GO) and an amino group ofaxial ligand (4-amino salicylic acid) coordinated to tin porphyrins. 1H NMR spectroscopy was used to detectthe successful formation of free-base porphyrins and their corresponding metal-linked and axially ligated tinporphyrins. In order to probe the interactions between GO and tin porphyrins, the nanohybrids were carefully characterized by using various analytical techniques like Powder X-Ray diffraction (P-XRD), Fourier transform infrared (FT-IR), UV–Visible spectroscopy (UV-Vis) and Fluorescence spectroscopy. These hybrid composites were also characterized by Powder-XRD analysis. The Ground-state absorption and steady-state luminescence measurement illustrated the presence of significant covalent interactions along with effective photoelectrons and excited energy exchange between the tin porphyrin and GO structure. The catalytic activity of resulting hybrids (GO-Sn-Porph 1) and (GO-Sn-Porph 2) were carefully investigated by using a UV-visible Spectrophotometer manifesting the effective reduction of 4-nitrophenol into 4-aminophenol. The mechanism for the catalytic activity of the synthesized nanocatalysts has been discussed.

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