Structure of binuclear platinum(III) acetamidate complexes in solutions as probed by ¹⁹⁵Pt, ¹³C, and ¹H NMR spectroscopy

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• 作者：G. A. Kirakosyan ; T. N. Fedotova ; G. N. Kuznetsova
• 关键词：platinum(III) ; binuclear complexes ; acetamidate bridges ; 2 ; 2′-bipyridine ; 1 ; 10 ; phenanthroline ; NMR spectroscopy
• 刊名：Russian Chemical Bulletin
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：64
• 期：10
• 页码：2408-2414
• 全文大小：181 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chemistry
  Organic Chemistry
  Inorganic Chemistry
  Russian Library of Science
  
• 出版者：Springer New York
• ISSN：1573-9171
• 卷排序：64

文摘

195Pt, 1H, and 13C NMR spectroscopy was used to study the structure of binuclear platinum(III) acetamidate complexes with 1,10-phenanthroline and 2,2′-bipyridine ligands [Pt₂(phen)₂(acam)₄](NO₃)₂ (1) and [Pt₂(bipy)₂(acam)₄](NO₃)₂ (2) in aqueous solutions. The 195Pt NMR spectra of solutions of complexes 1 and 2 in D₂O exhibit two signals with satellites due to the 195Pt–^{195Pt spin-spin coupling (1J(Pt–Pt) ≈ 6345 Hz), whereas their 1H and 13C NMR spectra contain four sets of signals for the protons and the carbon atoms of the heterocyclic and acetamidate ligands. The signals were assigned using the COSY, NOESY, and HSQC/ HMBC experiments and comparing the coordination shifts of the signals for the protons of heterocycles. These data allowed us to draw a conclusion that binuclear complexes 1 and 2 in solution have a head-to-head structure with nonequivalent platinum(III) atoms (coordination cores PtN₅ and PtN₃O₂), the axial-equatorial coordination of the bidentate heterocyclic molecules, and two bridging and two terminal acetamidate ligands.}