Acta Cryst. (2003). E59, m780-m783  [ doi:10.1107/S1600536803017756 ]

A head-to-tail isomer of bis[-2-(N'-methyl-4,4'-bipyridinium-1-yl)acetamidato]bis[cis-diammineplatinum(II)] hexaperchlorate dihydrate

K. Sakai, Y. Ikuta, T. Tsubomura, K. Kato, Y. Yokoyama, T. Kajiwara and T. Ito

Abstract: In the title compound, [Pt₂(-C₁₃H₁₄N₃O)₂(NH₃)₄](ClO₄)₆·2H₂O, the dinuclear Pt^II cation is found to be a head-to-tail isomer having pseudo-C₂ symmetry. Two positively charged viologen moieties tethered to the diplatinum unit are located at the farthest position to minimize the electrostatic repulsion between the moieties, and also serve as relatively strong electron-withdrawing groups, giving rise to a very long intradimer PtPt distance [3.0852  (13)  Å] which is the longest distance among those reported for amidate-bridged cis-diammineplatinum(II) dimers to date.

Online 23 August 2003

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