Rhodamine 6G-Labeled Pyridyl Aroylhydrazone Fe(II) Complex Exhibiting Synergetic Spin Crossover and Fluorescence
Rhodamine 6G-Labeled Pyridyl Aroylhydrazone Fe(II) Complex Exhibiting Synergetic Spin Crossover and Fluorescence
复制标题
罗丹明 6G 标记的吡啶基芳酰腙 Fe(II) 配合物表现出协同自旋交叉和荧光
DOI：
10.1021/jacs.8b00103
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发表时间：
2018
影响因子：
15
通讯作者：
Kou Hui Zhong
中科院分区：
文献类型：
--
作者：
Yuan Juan;Wu Shu Qi;Liu Mei Jiao;Sato Osamu;Kou Hui Zhong
本研究利用吡啶乙醛罗丹明6G腙配体(L)合成Fe（II）配合物1，用于寻找新的荧光自旋交叉（SCO）材料。单晶结构测定表明，Fe（II）离子被两个开环配体（L-o）螯合形成了一个fen4o2配位环境，并且分子间的杂蒽基团π—π接触连接相邻分子形成了一个超分子一维链。配合物1的磁化率测量表明，在120 ~ 350 K的温度范围内发生了三步SCO，其脱溶形式1在室温（Tc↑= 343 K和Tc↓= 303 K）下表现出SCO，其磁滞回线宽为40 K。此外，络合物1-d还表现出光诱导激发自旋态捕获现象。有趣的是，络合物1- 1在560 nm处最大发射的荧光强度在250-400 K范围内呈现不连续变化，表明存在协同荧光和SCO。
Here, we use a pyridinecarbaldehyde rhodamine 6G hydrazone ligand (L) to synthesize an Fe(II) complex1for the search of new fluorescent-spin crossover (SCO) materials. Single-crystal structural determinations suggest that the Fe(II) ion is chelated by two ring-opened ligands (L-o) to form a FeN4O2coordination environment, and intermolecular π---π contacts of the xanthene groups connect the adjacent molecules to form a supramolecular one-dimensional chain. Magnetic susceptibility measurements on complex1show that three-step SCO takes place in the temperature range of 120–350 K, and its desolvated form1-dexhibits SCO around room temperature (Tc↑ = 343 K andTc↓ = 303 K) with a wide hysteresis loop of 40 K. Moreover, complex1-ddisplays light-induced excited spin-state trapping phenomenon. Intriguingly, the fluorescence intensity of the maximum emission at 560 nm for complex1-ddisplays discontinuous variation in the range of 250–400 K, indicative of the occurrence of synergetic fluorescence and SCO.