CRYSTAL STRUCTURE OF DI-Ој-AMIDO-bis[DIAMMINEPLATINUM(II)] NITRATE
Q.-S. Ye1, M.-J. Xie2, X.-N. Li3, W.-P. Liu1, J. Yu1, Q.-W. Chang1, J. Jiang1, C.-X. Yan1, J. Li1
1Kunming Institute of Precious Metals, Kunming 650106, P. R. China
2Yunnan University, Kunming 650031, P. R. China
3Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China
Keywords: platinum, amide, ammine, crystal structure, synthesis
Abstract
Di-m-amido-bis[diammineplatinum(II)] nitrate (1) was synthesized as a byproduct during preparation of tetraammineplatinum(II) nitrate. One possible pathway to produce 1 is that [(H3N)2Pt(m-OH)2Pt(NH3)2](NO3)2, a well-known complex forming on treatment of cis -Pt(NH3)2I2 with AgNO3, reacts with aqueous ammonia. The other possible pathway involves deprotonation of [Pt(NH3)4](NO3)2 to form monomeric Pt(NH3)3(NH2)NO3 followed by elimination of NH3. Crystals of 1 (from water) are monoclinic ( C 2/ c ) with a = 16.834(2) Å, b = 10.573(1) Å, c = 7.415(1) Å, b = 114.846(1)°, and Z = 4. The cationic portion consists of two symmetrical square-planar Pt centers with the inversion center at the midpoint of the Pt(1)⋯Pt(1A) vector. The Pt(II) ion is coordinated by four N atoms from two ammonia molecules and two bridging amido groups affording a slightly distorted square. The molecules are stacked in such a way that the planes of coordination squares turn out to be parallel to each other with a distance of 3.501 Å. Intermolecular Pt-H interaction between the m-NH2 hydrogens and the platinum(II) centers of the adjacent molecule are observed.
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