The crystal structure of cis-diammine(orotinato)platinum(II).

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概要

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• From the reaction of <I>cis</I>-[Pt(NH<SUB>3</SUB>)<SUB>2</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>] with orotic acid, yellow needle crystals, green needle crystals, and dark-blue microcrystalline crystals were obtained. The results of elemental analyses, the IR absorption spectra, and X-ray Weissenberg photographs showed that the yellow and green needles are identical, whereas the dark-blue microcrystalline compound exhibits slight difference in the elemental analyses and IR spectra. Green needle crystals of <I>cis</I>-diammine(orotinato)platinum(II), <I>cis</I>-[Pt(NH<SUB>3</SUB>)<SUB>2</SUB>(C<SUB>5</SUB>H<SUB>2</SUB>N<SUB>2</SUB>O<SUB>4</SUB>)], were subjected to X-ray single crystal analysis. The crystals belong to the monoclinic system, with the space group P2<SUB>1</SUB>/c, and the cell dimensions are <I>a</I>=7.468(5), <I>b</I>=7.537(3), <I>c</I>=15.618(9) Å, and β=107.90(7)°, with <I>Z</I>=4. The structure was solved by the heavyatom method and refined to the final <I>R</I> value of 0.0567 for 1918 non-zero reflections. The complex is almost planar, and the platinum atom is coordinated by the orotic acid at N1 and carboxylic oxygen, forming a fivemembered chelate ring. The structure of the pyrimidine ring of the orotic acid is compared with free and coordinated uracil and thymine. No definite explanation for the color difference was obtained.

• 公益社団法人 日本化学会の論文

著者

• Matsumoto Kazuko

  Department Of Applied Mathematics Osaka Women's University

• Solin Takaaki

  Department of Chemistry, Faculty of Science, The University of Tokyo

• Fuwa Keiichiro

  Department of Agricultural Chemistry, Faculty of Agriculture The University of Tokyo

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