A novel ferromagnetic complex [BrFBzPy][Ni(mnt)2], where [BrFBzPy]+
= 1-(4′-bromo-2′-fluorobenzyl)pyridinium and mnt2−
= maleonitriledithiolate, has been prepared and characterized. In the crystal structure the most prominent feature is that the [Ni(mnt)2]− anions and [BrFBzPy]+ cations form a well-separated stacking column along the c-axis, within which the [Ni(mnt)2]− anions are uniformly spaced to give a one-dimensional (1-D) chain structure. The magnetic properties of this complex have been investigated in the temperature range 1.8–300 K and its magnetization studies show there exists ferromagnetically coupled interactions within the [Ni(mnt)2]− anion chain (J
= 42.2 cm−1), and antiferromagnetically coupled interactions between [Ni(mnt)2]−
anion chains (Jeff
=
−4.78cm−1). The temperature dependences of the ac susceptibility revealed that this 1-D chain system is ferromagnetically ordered around 2 K and χac measurements performed at different magnetic fields and frequencies suggest that there may coexist a degree of spin glass behaviour at low temperature.
我们制备了一种新型
铁磁性复合物 [BrFBzPy][Ni(mnt)2],其中 [BrFBzPy]+ = 1-(4′-
溴-2′-
氟苄基)
吡啶鎓,mnt2- = 马来
酰亚胺二
硫酸盐。在晶体结构中,最突出的特征是[Ni(mnt)2]-阴离子和[BrFBzPy]+阳离子沿着 c 轴形成了一个分离良好的堆积柱,其中[Ni(mnt)2]-阴离子的间距均匀,形成了一维(1-D)链结构。磁化研究表明,[Ni(mnt)2]- 阴离子链内部存在
铁磁耦合相互作用(J = 42.2 cm-1),[Ni(mnt)2]- 阴离子链之间存在反
铁磁耦合相互作用(Jeff = -4.78cm-1)。交流电感的温度依赖性表明,这种一维链系统在 2 K 附近是
铁磁有序的,在不同磁场和频率下进行的 χac 测量表明,在低温下可能同时存在一定程度的自旋
玻璃行为。