以氮氧自由基NIT-5-Br-3Py为配体的Cu(Ⅱ)配合物的合成、晶体结构和磁性研究  

Synthesis,Crystal Structure and Magnetic Properties of Cu(Ⅱ)Complex with Nitroxide Radical NIT-5-Br-3Py as Ligand

作　　者：许金霞[1,2] 颜范勇[1] 孙晓东[1] 马越[2] Xu Jinxia;Yan Fanyong;Sun Xiaodong;Ma Yue(School of Chemistry and Chemical Engineering,Tianjin Polytechnic University,Tianjin 300387,China;Department of Chemistry,Nankai University,Tianjin 300071,China)

机构地区：[1]天津工业大学化学化工学院,天津300387 [2]南开大学化学学院,天津300071

出　　处：《南开大学学报（自然科学版）》2019年第5期67-71,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：天津市自然科学基金(18JCYBJC87500)

摘　　要：合成了一个Cu(Ⅱ)-氮氧自由基配合物[Cu(hfac)2(NIT-5-Br-3Py)]2(其中hfac=1,1,1,5,5,5-六氟乙酰丙酮,NIT-5-Br-3Py=2-(5′-溴-3′-吡啶基)-4,4,5,5-四甲基咪唑啉-3-氧化-1-氧基自由基).X-射线单晶衍射结果表明,该配合物属于单斜晶系,P21/a空间群.它具有二聚体结构,2个Cu(Ⅱ)和2个自由基形成中心对称的环形,其中NIT-5-Br-3Py作为一个桥联配体,通过N-O自由基部分中的O原子和吡啶环上的N原子连接2个Cu(Ⅱ)离子,构成双核四自旋体系.变温磁化率研究表明,配合物中Cu(Ⅱ)离子和氮氧自由基NIT-5-Br-3Py之间存在很强的反铁磁相互作用.The nitroxide radical-Cu(Ⅱ)complex of[Cu(hfac)2(NIT-5-Br-3Py)]2(hfac=1,1,1,5,5,5-hexafluoroacetylacetonate,NIT-5-Br-3py=2-(5'-bromo-3'-pyridyl)-4,4,5,5-tetrame-thyl-3-oxylimidazo-line-1-oxyl)has been synthesized and characterized structurally and magnetically.The single crystal X-ray analysis reveals that the complex crystallizes in the monoclinic space group P21/a.It has a dimeric struc-ture,two Cu(Ⅱ)and two radicals form a centrally symmetric ring,in which NIT-5-Br-3Py molecular acts as a bridging ligand linking two Cu(Ⅱ)ions through the oxygen atom of the N-O group and nitrogen atom from the pyridine ring to form a binuclear four-spin system.The variable magnetic measurement shows that there exists strong antiferromagnetic interaction between the Cu(Ⅱ)ion and the nitrogen radical NIT-5-Br-3Py in the complex.

关 键 词：氮氧自由基 Cu(Ⅱ) 晶体结构 磁性 

分 类 号：O614[理学—无机化学]