• Kota Thirumala Prasad

      Articles written in Journal of Chemical Sciences

    • Study of half-sandwich mono and dinuclear complexes of platinum group metals containing pyrazolyl pyridine analogues: Synthesis and spectral characterization

      Venkateswara Rao Anna Kota Thirumala Prasad Peng Wang Kollipara Mohan Rao

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      The chelating ligands 3-chloro-6-(3-pyridyl-1-pyrazolyl)pyridazine ($pp-Cl$) and 3,6-bis(3-pyridyl-1-pyrazolyl)pyridazine (bppp), were prepared by the condensation of pyridylpyrazole and 3,6-dichloropyridazine. The mononuclear complexes [($\eta^6$-arene)Ru($pp$-Cl)Cl]+ $\{\eta^6$-arene = C6H6 (1); 𝑝-${}^i$PrC6H4Me (2)}, [($\eta^5$-C5Me5)M($pp$-Cl)]+ {M = Rh (3); Ir (4)}, [($\eta^6$-arene)Ru($bppp$)Cl]+ $\{\eta^6$-arene = C6H6 (5); 𝑝-${}^i$PrC6H4Me (6)}, [($\eta^5$-C5Me5)M(bppp)]+ {M =Rh (7); Ir (8)} as well as the binuclear complexes [{($\eta^6$-arene)RuCl}2(bppp)]2+ {$\eta^6$ -arene =C6H6 (9); 𝑝-$^i$PrC6H4Me (10)} and [{($\eta^5$-C5Me5)MCl}2(bppp)]2+ {M = Rh (11); Ir (12)} have been synthesized from 3-chloro-6-(3-pyridyl-1-pyrazolyl)pyridazine ($pp-Cl$) or 3,6-bis(3-pyridyl-1-pyrazolyl)pyridazine (bppp) and the corresponding dimers [($\eta^6$-arene)Ru(𝜇-Cl)Cl]2 and [CpM(𝜇-Cl)Cl]2, respectively. All complexes were isolated as their hexafluorophosphate salts and characterized by IR, NMR, mass spectrometry and UV-visible spectroscopy. The molecular structures of [2]PF6 and [7]PF6 have been established by single crystal X-ray structure analysis.

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