Bis­[μ-3-(N′-methyl-4,4′-bipyridinium-1-yl)­propionamidato]­bis­[cis-diammineplatinum(II)] hexaperchlorate dihydrate: a head-to-tail isomer

In the title compound, [Pt₂(μ-C₁₄H₁₆N₃O)₂(NH₃)₄](ClO₄)₆·2H₂O, the diplatinum(II) cation is found to be a head-to-tail isomer. The intradimer Pt—Pt distance [3.0304 (7) Å] is much shorter than the value of 3.0852 (13) Å reported for the analogous cis-diammineplatin­um(II) dimer bridged by 2-(N′-methyl-4,4′-bipyridinium-1-yl)­acetamidates [Sakai, Ikuta, Tsu­bomura, Kato, Yokoyama, Kajiwara & Ito (2003). Acta Cryst. E59, m780–m783], showing that the electron density at the metal centers is higher in the title system than in the previously reported system. The shortest interdimer Pt⋯Pt distance is 8.4585 (8) Å.