• Babulal Das

      Articles written in Journal of Chemical Sciences

    • Quinolizidines alkaloids: Petrosin and xestospongins from the sponge Oceanapia sp.

      Keisham Sarjit Singh Babulal Das Chandrakant G Naik

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      A bisquinolizidine alkaloid, petrosin (1) and a series of bis-1-oxaquinolizidine, xestospongins (2-9), were obtained from the ethyl acetate extract of the sponge Oceanapia sp. Petrosin was obtained along with xestospongin- C, D, E, F, G, H, I and J having di-hetroatom rings, from the ethyl acetate extract of the sponge. The compounds exhibited moderate to high activities against some microorganisms and clinical isolates. The structures of the alkaloids were elucidated by NMR and ESIMS spectroscopic data. The structure of petrosin was confirmed by an X-ray diffraction study.

    • Study of $\eta^6$- cyclic 𝜋-perimeter hydrocarbon ruthenium complexes bearing functionalized pyridyl diketones: Isolation of complexes with $\kappa^2$-N∩O and $\kappa^4$-N∩O bonding modes of ligands

      Saphidabha L Nongbri Babulal Das Mohan Rao Kollipara

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      Chelating mono- and di-pyridyl functionalized 𝛽-diketones, viz. 1-phenyl-3-(2-pyridyl) propane-1,3-dione (pppdH) and 1,3-di(2-pyridyl)propane-1,3-dione ($dppdH$) ligands yielded new water soluble $\eta^6$-arene ruthenium(II) complexes of the formulation [($\eta^6$-arene)Ru($\kappa^2$-N-O-pppdH)Cl]+ (arene = C6H6 1, p$^i$PrC6H4Me 2, C6Me6 3) and [($\eta^6$-arene)2Ru2($\kappa^4$-N-O-$dppd$)Cl2]+ (arene = C6H6 4, 𝑝-$^i$PrC6H4Me 5, C6Me6 6), as their (complexes 1-4, 6) PF6 salt or (complex 5) BF4 salt. The complexes were obtained by treatment of respective precursors, [($\eta^6$-arene)Ru(𝜇-Cl)Cl]2 (arene = C6H6, 𝑝-$^i$PrC6H4Me, C6Me6) in 1:2 and 1:1 molar ratio with pppdH and $dppdH$ in the presence of NH4PF6/NH4BF4. All the complexes have been characterized on the basis of FT-IR and NMR spectroscopic data as well as by elemental analysis. Molecular structures of representative complexes 2, 5 and 6 have been confirmed by single crystal X-ray diffraction studies. The `$O-C-C-C-O$' fragment of the coordinated ligand (pppdH) is neutral in complexes 1-3 and that of the $dppdH$ ligand existed as a neutral as well as concomitantly uninegative fashion in complexes 4-6 due to the delocalization of 𝜋-electrons.

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