Switching of spin states triggered by a phase transition: spin-crossover properties of self-assembled iron(II) complexes with alkyl-tethered triazole ligands.
Switching of spin states triggered by a phase transition: spin-crossover properties of self-assembled iron(II) complexes with alkyl-tethered triazole ligands.
复制标题
DOI：
10.1021/ja038088e
复制
发表时间：
2003-11
影响因子：
15
通讯作者：
T. Fujigaya;D. Jiang;T. Aida
中科院分区：
文献类型：
--
作者：
T. Fujigaya;D. Jiang;T. Aida
具有两个C12和C16长烷基链的三唑衍生物的铁（II）络合物（C12 trz）FeII和（C16 trz）FeII作为新型自旋交叉材料，其响应于相变而显示自旋状态转变。相比之下，具有两个C8烷基链的三唑络合物（（C8 trz）FeII）仅表现出差的响应。EXAFS和XRD分析表明（C16 trz）Fe Ⅱ具有多核铁（II）物种的叉指状自组装结构。根据DSC、VT-IR和VT-XRD曲线，自旋态转变是由相互交叉的烷基链的熔化触发的，这可能是自旋态的“锁定和释放”特征的原因。由于相变的热可逆性，自旋交叉可以重复而不恶化。
Iron(II) complexes of triazole derivatives having two C12 and C16 long alkyl chains, (C12trz)FeII and (C16trz)FeII, serve as novel spin-crossover materials, which display a spin-state transition in response to a phase transition. In contrast, a triazole complex with two C8 alkyl chains ((C8trz)FeII) exhibits only a poor response. EXAFS and XRD analyses of (C16trz)FeII indicate an interdigitating self-assembled structure of polynuclear iron(II) species. According to DSC, VT-IR, and VT-XRD profiles, the spin-state transition is triggered by melting of the interdigitating alkyl chains, which is likely responsible for the "lock-and-release" feature of the spin state. By virtue of the thermoreversibility of the phase transition, the spin crossover could be repeated without deterioration.