一维交替铁磁-反铁磁耦合的海森堡链[Mn(N_3)_2(pybox)]_n(英文)  

One-Dimensional Alternating Ferromagnetic-Antiferromagnetic Coupled Heisenberg Chain [Mn~Ⅱ(N_3)_2(pybox)]_n

作　　者：刘娜[1] 贾丽慧[2] 吴宗铨[1] 朱元元[1,3] 王炳武[3] 高松[3] 

机构地区：[1]合肥工业大学,化学工程学院,功能材料与器件安徽省重点实验室,合肥200039 [2]武汉工程大学,化工与制药学院,绿色化工过程省部共建教育部重点实验室,武汉430073 [3]北京大学,化学与分子工程学院,北京分子科学国家实验室,稀土材料化学及应用国家重点实验室,北京100871

出　　处：《无机化学学报》2014年第7期1660-1666,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21071008,21101123,21371043,21304027,21302035);北京分子科学国家实验室开放基金资助项目~~

摘　　要：合成了一种叠氮锰一维链状化合物([MnⅡ(N3)2(pybox)]n,1),该化合物采用2,6-吡啶双噁唑啉(pybox)三齿配体和叠氮作为共配体。用单晶X射线衍射的方法对其晶体结构进行了表征,结果表明二价锰离子通过双EO叠氮桥和双EE桥交替桥连成链状结构,其中锰离子分别与4个叠氮根和1个pybox配体上的3个氮原子配位,为七配位模式。变温磁化率数据表明,交替的EO叠氮桥和EE叠氮桥分别传递铁磁和反铁磁耦合相互作用形成一维交替的海森堡链。通过S=5/2交替铁磁-反铁磁耦合一维体系的理论模型,我们获得其磁耦合常数为:J1=9.19 cm-1,J2=-19.89 cm-1。化合物1在低温表现出反铁磁有序。We present here the structure and magnetism of the magnetic manganese-azido 1D chain compound of the type [Mn ^Ⅱ（N3）2（pybox）]n （pybox=2,6-bis（4,5-dihydrooxazol-2-yl）pyridine）, prepared by tridentate coligand pybox. In the structure, manganese（Ⅱ） ions are alternatively bridged by double end-on azido ligands and double end-to- end azido ligands. Each Mn（Ⅱ） cation possesses a seven coordination model, completed by three nitrogen atoms of one pybox ligand. The magnetic properties of this complex were systematically studied. The variable-temperature magnetic susceptibility data displays the existence of alternating ferro- and antiferromagnetic coupling through EO and EE azido bridges, respectively. The exchange parameters of J1=9.19 cm^-1 and J2=-19.89 cm^-1 were obtained by a theoretical model for an S =5/2 alternating ferromagnetic-antiferromagnetic coupled 1D system. Also, 1 exhibits antiferromagnetic ordering behavior at low temperature.

关 键 词：叠氮 二价锰离子 海森堡链 磁性质 

分 类 号：O614.711[理学—无机化学]