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.

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.