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• W2019977633 abstract "The square-planar platinum(II) complexes [PtCl3(H2Meppz)] (1), trans-[PtCl2(H2Meppz)2]2+2Cl−·2H2O (2), and cis-[PtCl2-(Me2ppz)] (3) (HMeppz=N-methylpiperazine, Me2ppz=N,N′-dimethylpiperazine) have been synthesized and characterized by IR, 1H NMR and X-ray diffraction analysis. In complexes 1 and 2 the hexaatomic ring of N-methylpiperazine adopts a chair conformation with the NCH3 and NPt bonds in equatorial position and the two NH bonds in axial position. The coordination to platinum(II) always occurs through the unmethylated nitrogen atom while the methylated nitrogen is protonated, producing a positive charge on the outside surface of the molecule. In addition, complex 1 is present as an amphilonic species since N+HCH3 is balanced by -PtCl3−. In contrast, in complex 3N,N′-dimethylpiperazine adopts a boat conformation stabilized by chelation of the nitrogen donors to platinum(II) so that complex 3 represents a rare example of piperazine chelated to platinum(II). An attempt is also made to correlate the biological activity of chair and boat piperazine complexes with their structural parameters." @default.
• W2019977633 created "2016-06-24" @default.
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• W2019977633 date "1998-07-01" @default.
• W2019977633 modified "2023-10-03" @default.
• W2019977633 title "Boat versus chair conformation in N-methyl- and N,N′-dimethylpiperazine platinum(II) complexes studied by X-ray analysis. A rare example of metal chelate piperazine: cis-[PtCl2(Me2ppz)] Part I" @default.
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• W2019977633 doi "https://doi.org/10.1016/s0020-1693(98)00068-1" @default.
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