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单臂氮氧自由基-抗磁金属Cd(Ⅱ)配合物的合成、结构和磁性研究

Synthesis,Crystal Structure and Magnetic Properties of Imino Nitroxide Radical-diamagnetic Metal Cd(Ⅱ) Complex
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摘要 采用吡啶取代的单臂氮氧自由基与抗磁金属Cd(Ⅱ)进行配位,得到了一个新的单核配合物[Cd(IM4Py)_4(OCN)_2·2H_2O](其中IM4Py=2-(4′-吡啶基)-4,4,5,5-四甲基咪唑啉-1-氧基自由基).单晶X-射线衍射结果表明,配合物属四方晶系,I4(1)/a空间群;晶胞参数a=1.443 9(3)nm,b=1.443 9(3)nm,c=2.528 7(2)nm,其中每个Cd(Ⅱ)离子采取六配位的变形八面体构型,分别与四个空间对称的IM4Py自由基上的吡啶氮原子以及两个线型氰酸根阴离子上的氮原子配位,形成单核四自旋配合物.变温磁化率研究表明,由抗磁金属Cd(Ⅱ)连接的IM4Py自由基间存在弱的反铁磁相互作用. The nitroxide radical-diamagnetic metal Cd(Ⅱ) complex of[Cd(IM4Py)_4 (OCN)_2·2H_2O](IM4Py = 2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl) was synthesized and characterized structurally and magnetically.It crystallizes in the tetragonal space group I4(1)/a,with a = 1.443 9(3),6=1.443 9(3),c = 2.528 7(2) nm.Every Cd(Ⅱ) is coordinated by four IM4Py and two OCN- in a octahedron environment.The variable magnetic measurement shows that there is weak antiferromagnetic interaction between the four IM4Py radicals linked by Cd(Ⅱ) ion.
机构地区 南开大学化学系
出处 《南开大学学报(自然科学版)》 CAS CSCD 北大核心 2011年第1期20-24,共5页 Acta Scientiarum Naturalium Universitatis Nankaiensis
基金 国家自然科学基金(20631030 90922032) 国家基础研究项目(973项目 2007CB815305) 天津市自然科学基金(09JCYBJC05500) 中央高校基本科研业务费专项资金 南开大学本科生创新科研计划"百项工程"项目(BX8-076) 高等学校博士点基金(20100031120013)
关键词 氮氧自由基配合物 抗磁金属Cd(Ⅱ) 晶体结构 磁性 nitroxide radical complex diamagnetic metal Cd(Ⅱ) crystal structure magnetic properties
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参考文献24

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