• Saphidabha L Nongbri

      Articles written in Journal of Chemical Sciences

    • 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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