高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (11): 1672.

• 论文 • 上一篇    下一篇

具有非正规自旋态的氮氧自由基桥联双镍配合物的合成、表征和磁性研究

孙柏旺, 姜宗慧, 廖代正, 还振威, 刘爱俭, 王耕霖   

  1. 南开大学元素有机化学国家重点实验室, 南开大学化学系, 天津, 300071
  • 收稿日期:1995-01-14 修回日期:1995-03-20 出版日期:1995-11-24 发布日期:1995-11-24
  • 通讯作者: 姜宗慧
  • 作者简介:孙柏旺,男,30岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Synthesis Characterization and Magnetism of μ-Nitronyl Nitroxide Binuclear Nickel (Ⅱ) Complexcs with Irregular Spin States

SUN Bai-Wang, JIANG Zong-Hui, LIAO Dai-Zheng, HUAN Zhen-Wei, LIU Ai-Jian, WANG Geng-Lin   

  1. Nankai National Key Laboratory on Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1995-01-14 Revised:1995-03-20 Online:1995-11-24 Published:1995-11-24

PDF (PC)

被引次数

7

摘要： 合成了4种氮氧自由基桥联的五氟丙酸镍双核配合物[Ni(pfpr)2]2NITR·nH2O.对该配合物进行了元素分析和热重-差热分析,测定了红外光谱、紫外-可见光谱、电子顺磁共振和摩尔电导。讨论了配合物的结构,测量了[Ni(pfpr)2]2NITPhCl·4H2O和[Ni(pfpr)2]2NITPhOMe·4H2O的变温磁化率(4～300K),表明配合物具有非正规自旋态的Ni(Ⅱ)-Cu(Ⅱ)-Ni(Ⅱ)三核体系的磁行为。通过与理论公式拟合,得到交换积分J值分别为-152.8cm-1和-174.6cm-1,表明镍-自由基-镍之间有较强的反铁磁相互作用。

关键词: 五氟丙酸镍, 氮氧自由基, 磁性

Abstract: Four complexes of the general formula[Ni(pfpr)2]2NITR·nH2O, where pfpr=pentafluoropropionate, NITR=2-R-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide, and n=2(for R = ph);3(for R = phMe);4(for R = phCl,PhOMe),were synthesized,Thesecomplexes were characterized by elemental analyses,TG-DTA IR,electronic spectra,ESR and molar conductances. The structures of these complexes were discussed.The variable temperature(4-300 K) magnetic susceptibilities of the complexes[Ni(pfpr)2]2NITPHCl·4H2O and [Ni(pfpr)2]2NITPhOMe·4H2O were determined, indicating that the complexes have a magnetic behaviour of trinuclear system Ni(Ⅱ)-Cu(Ⅱ)-Ni(Ⅱ) with irregular spin state. The observed susceptihility data were fitted to those from theoretical magnetic equation,The exchange constants,J,were found to be equal to-152. 8cm-1and-174.6 cm-1,respectively,This indicates a stronger antiferromagnetic spin-exchange interaction between the radical and nickel (Ⅱ) ion.

Key words: Nickle pentafluoropropionate, Nitronyl nitroxides, Magnetism

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