• SURYA PRAKASH SINGH

      Articles written in Journal of Chemical Sciences

    • Ruthenium-bipyridine complex catalyzed C–H alkenylation of arylpyrazole derivatives

      SANCHARI SHOME SURYA PRAKASH SINGH

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      Direct dehydrogenative alkenylation of N-arylpyrazoles by acrylates has proven to be efficient under Ru(II) carboxylate complexes SPS-BPY and SPS-DB-BPY catalyst along with Cu(OAc)2·H2O as an oxidant. The reaction was found to be atom-economical and was characterized by a number of substituted Narylpyrazoles with excellent chemoselectivity. The reaction allowed a direct alkenylation to be performed under the eco-friendly solvent system. The diverse functional group tolerance of this protocol opened up a new insight to the use of ruthenium(II) bipyridine complexes as a productive method for the oxidative heterocoupling of N-arylpyrazole.

    • Distyryl 1,2-Bis(2-pyridylmethoxy) benzene substituted near infrared BODIPY photosensitizers: synthesis and spectroscopic studies

      GAYATHRI THUMUGANTI POULOMI MAJUMDAR SURYA PRAKASH SINGH

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      Near-infrared BODIPY photosensitizers with symmetrical 2,6-diiodo 3,5-distyryl 1,2-Bis(2-pyridylmethoxy) benzene were synthesized to study the singlet oxygen (1O2) photosensitizing efficiency astriplet photosensitizer as well as fluorescent sensors for metal cation recognition. Moderate singlet oxygen(1O2) quantum yield (ϕΔ) was obtained for the photosensitizers. Emission intensity of the photosensitizersincreased ca. by 1.4-2-fold upon addition of Hg2+ and Fe2+ ions. The discussed results are useful to designnear-infrared photosensitizers with long lived triplet excited states for various applications such as PDT,fluorescent bioimaging and sensor materials.

      Symmetrical 2,6-diiodo 3,5-distyryl 1,2-bis(2-pyridylmethoxy) benzene containing near-infrared (NIR) BODIPY photosensitizers were reported to screen the singlet oxygen (1O2) photosensitizing efficiency as triplet photosensitizer as well as fluorescent sensors for metal cation recognition.

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