塩化白金酸溶液の紫外可視吸収スペクトルと塩素イオン濃度の測定による錯体挙動予測 Estimation of Ligand Substitution for Chloroplatinic Acid Solution from Measurements of Cl^- Concentration and UV-Vis Absorption Spectra

この論文にアクセスする

この論文をさがす

著者

    • 西須 佳宏 NISHISU Yoshihiro
    • 産業技術総合研究所 環境管理技術研究部門 リサイクル基盤技術研究グループ Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology (AIST)
    • 大矢 仁史 OHYA Hitoshi
    • 産業技術総合研究所 環境管理技術研究部門 リサイクルシステム評価研究グループ Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology (AIST)
    • 小林 幹男 KOBAYASHI Mikio
    • 産業技術総合研究所 環境管理技術研究部門 Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology (AIST)

抄録

Chloroplatinic acid, for example hydrogen hexachloroplatinate (IV) (H<SUB>2</SUB>[PtCl<SUB>6</SUB>]), undergoes a ligand substitution reaction in aqueous solution. Rate of the ligand substitution was estimated from measurement of ultraviolet-visible (UV-Vis) absorption spectrophotometry and ion-exchange chromatography under different chloride concentrations, light conditions, and time frames. [PtCl<SUB>4</SUB>]<SUP>2-</SUP> in the PtCl<SUB>2</SUB> solution of 20w% hydrochloric acid indicated absorption peaks on its spectrum, that was distinguished from Cl<SUP>-</SUP> and Pt (IV) complexes. Spectrum of [Pt(OH)<SUB>2</SUB>Cl<SUB>4</SUB>]<SUP>2-</SUP> in the PtCl<SUB>4</SUB> solution diluted with ultra pure water changed with passage of time under normal fluorescent lighting. Absorbance at the wavelength below 380nm decreased with time, while that increased at the wavelength above. Simultaneously, the concentration of Cl<SUP>-</SUP> measured by ion chromatography decreased with time. These aging characteristics were referred from reaction pathway of the ligand substitution of OH<SUP>-</SUP> for Cl<SUP>-</SUP>. Drop of downward slop on the spectra at lower wavelength meant precipitation of hydrogen hydroxoplatinate (H<SUB>2</SUB>[Pt(OH)<SUB>6</SUB>]) induced by the substitution reaction. Hydrochloric acid was added to the diluted chloroplatinic acid solutions after that had reached equilibrium, and then prepared solutions also underwent measurement of UV-Vis spectra periodically. Characteristic of the spectra of above prepared solutions aged for several days, conformed with that of H<SUB>2</SUB>[PtCl<SUB>6</SUB>] solution. Spectra of the chloroplatinic acid solution with [PtCl<SUB>6</SUB>]<SUP>2-</SUP> had a specific peak at 260nm, and the peak area absorbance was in inverse proportion to Cl<SUP>-</SUP> concentration measured by ion chromatography. Thus, the change of this absorbance indicates the substitution of OH<SUP>- </SUP>for Cl<SUP>-</SUP>. Chloroplatinic acid diluted with hydrochloric acid or sodium hydroxide solutions showed above-mentioned change patterns not only under lighting but also in the dark. To the contrary, that of diluted with ultra pure water showed no changes in the dark. The reaction rate of the substitution was accelerated by lighting and increasing of amount of additions.

収録刊行物

  • Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan  

    Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan 124(3), 196-204, 2008-03-25 

    The Mining and Materials Processing Institute of Japan

参考文献:  12件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10021121419
  • NII書誌ID(NCID)
    AA12188381
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    18816118
  • NDL 記事登録ID
    9440890
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  NDL  J-STAGE 
ページトップへ