Acta Cryst. (2003). E59, m532-m535  [ doi:10.1107/S1600536803013497 ]

A head-to-head isomer of bis{bis(-5-carboxy--pyridonato)bis[cis-diammineplatinum(II)]} tetranitrate tetrahydrate

K. Sakai and S. Takahashi

Abstract: In the title compound, [Pt₂(C₆H₄NO₃)₂(NH₃)₄]₂(NO₃)₄·4H₂O, a head-to-head dimer has an association with another dimer unit through an inversion center to give a tetraplatinum chain structure. The interaction is stabilized not only by a metal-metal interaction but also by four hydrogen bonds formed between the ammines and the O atoms of bridging amidates [NO = 2.988  (17) and 3.030  (16)  Å]. The intra- and interdimer Pt-Pt distances within the tetranuclear cation are 2.9023  (8) and 3.1821  (11)  Å, respectively.

Online 30 June 2003

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