...
【24h】

Studies of a linear single-molecule magnet

机译:线性单分子磁体的研究

获取原文
获取原文并翻译 | 示例
           

摘要

Reaction of the dinuclear complex [Mn2O2(bpy)(4)](ClO4)(3) with H(3)cht (cis, cis- 1,3,5-cyclohexanetriol) in MeCN produces the complex [Mn-3(Hcht)(2)(bpy)(4)](ClO4)(3)center dot Et2O center dot 2MeCN (1 center dot Et2O center dot 2MeCN). Dc magnetic susceptibility measurements reveal the existence of weak ferromagnetic exchange between the three Mn ions, leading to a spin ground state of S = 7, with D= -0.23 cm(-1). W-Band (94GHz) EPR measurements on restrained powdered crystalline samples confirm the S = 7 ground state and determine the ground state zero-field splitting (ZFS) parameters of D = -0.14 cm(-1) and B-4(0)= + 1.5 x 10(-5) cm(-1). The apparent 4th order behaviour is due to a breakdown of the strong exchange limit approximation (J approximate to d, the single-ion ZFS). Single crystal dc relaxation decay and hysteresis loop measurements reveal the molecule to have an appreciable energy barrier to magnetization relaxation, displaying low temperature sweep rate and temperature-dependent hysteresis loops. Density functional studies confirm the ferromagnetic exchange coupling between the Mn ions.
机译:在MeCN中双核络合物[Mn2O2(bpy)(4)](ClO4)(3)与H(3)cht(顺式,顺式,1,3,5-环己三醇)的反应生成了络合物[Mn-3(Hcht )(2)(bpy)(4)](ClO4)(3)中心点Et2O中心点2MeCN(1个中心点Et2O中心点2MeCN)。直流磁化率测量显示三个Mn离子之间存在弱铁磁交换,导致自旋基态S = 7,D = -0.23 cm(-1)。对受约束的粉末状晶体样品进行的W波段(94GHz)EPR测量确认了S = 7基态并确定了D = -0.14 cm(-1)和B-4(0)的基态零场分裂(ZFS)参数= + 1.5 x 10(-5)cm(-1)。明显的四阶行为是由于强交换极限近似值(J近似于d,单离子ZFS)的破坏。单晶直流弛豫衰减和磁滞回线测量表明该分子对磁化弛豫具有明显的能垒,显示出低温扫描速率和温度相关的磁滞回线。密度泛函研究证实了Mn离子之间的铁磁交换耦合。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号