Abstract

Two novel platinum(IV) nitrate complexes, Cs₂[Pt(NO₃)₆] (1) and Cs₂[Pt₂(μ-OH)₂(NO₃)₈] (2), are prepared by adding cesium nitrate to a solution of platinum(IV) hydroxide in nitric acid. It is established that the main reaction product is the Cs₂[Pt(NO₃)₆] mononuclear complex, while Cs₂[Pt₂(μ-OH)₂(NO₃)₈] is formed only after the removal of the first portion of the precipitate and subsequent long-term storage of the mother liquor. The structures of the salts are studied by XRD. Crystal data for Cs₂[Pt(NO₃)₆] (1): a = 9.7346(3) Å, b = 11.5072(3) Å, c = 13.6813(2) Å, space group Pbcn, Z = 4. Crystal data for Cs₂[Pt₂(μ-OH)₂(NO₃)₈] (2): a = 7.0889(2) Å, b = 14.2216(6) Å, c = 10.7931(4) Å, β = 91.776(1)°, space group P2₁/n, Z = 2. It is shown that NO₃ ligands in (1) occupy atypical positions. The geometry of the complex anion in (2) is similar to the one described for (Me₄N)₂[Pt₂(μ-OH)₂(NO₃)₈]. Powdered samples of (1) and those of a mixture of (1) and (2) are characterized by powder XRD and IR spectroscopy. The obtained compounds are shown to be stable upon long-term storage in air.

中文翻译：

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铂 (IV) 与铯阳离子的硝基配合物

摘要

通过添加硝酸铯制备了两种新型硝酸铂(IV)配合物Cs ₂ [Pt(NO ₃ ) ₆ ] ( 1 )和Cs ₂ [Pt ₂ (μ-OH) ₂ (NO ₃ ) ₈ ] ( 2 )氢氧化铂(IV) 的硝酸溶液。确定主要反应产物是Cs ₂ [Pt(NO ₃ ) ₆ ]单核配合物，而Cs ₂ [Pt ₂ (μ-OH) ₂ (NO ₃ ) ₈ ]只有在除去第一个配合物后才形成。部分沉淀物和随后的母液的长期储存。通过 XRD 研究盐的结构。_{Cs 2} [Pt(NO ₃ ) ₆ ] ( 1 )的晶体数据：a  = 9.7346(3) Å, b  = 11.5072(3) Å, c  = 13.6813(2) Å, 空间群Pbcn , Z  = 4。晶体Cs ₂ [Pt ₂ (μ-OH) ₂ (NO ₃ ) ₈ ] ( 2 ) 数据：a  = 7.0889(2) Å, b  = 14.2216(6) Å, c  = 10.7931(4) Å, β = 91.776 (1)°，空间群P 2 ₁ / n，Z  = 2。结果表明( 1 )中的NO ₃配体占据非典型位置。( 2 )中的络合阴离子的几何形状类似于(Me ₄ N) ₂ [Pt ₂ (μ-OH) ₂ (NO ₃ ) ₈ ]所述的几何形状。( 1 )的粉末样品以及( 1 )和( 2 )的混合物的粉末样品通过粉末XRD和IR光谱进行表征。所得化合物在空气中长期储存时表现出稳定。