Wang Chun-Feng, Yang Guo-Yu, Yao Zi-Shuo, Tao Jun
Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
Chemistry. 2018 Mar 2;24(13):3218-3224. doi: 10.1002/chem.201704901. Epub 2018 Feb 5.
The grafts of fluorophores 9-anthraldehyde (AD) and 9-phenanthrenecarboxaldehyde (PD), respectively, on the one-dimensional spin-crossover compound Fe(L) (FeL, L=4-amino-1,2,4-triazole) by post-synthetic aldimine condensation reactions produced two spin-crossover (SCO)-fluorescent hybrid materials, that is, FeL-AD and FeL-PD. The spin-crossover critical temperatures of the two materials both centered at T ↓=254 and T ↑=256 K, whereas the fluorescence intensities of the two materials featured functions of the temperature that strictly synchronized with the spin-crossover processes, which showed that the ligand-centered fluorescence was dominated by the spin states of the ferrous ions. The bifunctional entities (spin-crossover centers and fluorophores) in FeL-AD or FeL-PD showed spectral band overlap that purported the Förster resonance energy transfer mechanism of such spin-crossover-fluorescence correlation. The post-synthetic modification of SCO materials and the relationship between the fluorescence and the SCO may be helpful in the development of multifunctional materials that can be sensitive to multiple stimuli.
通过后合成醛亚胺缩合反应，分别将荧光团9-蒽甲醛（AD）和9-菲甲酸醛（PD）接枝到一维自旋交叉化合物Fe(L)（FeL，L = 4-氨基-1,2,4-三唑）上，制备了两种自旋交叉（SCO）-荧光杂化材料，即FeL-AD和FeL-PD。两种材料的自旋交叉临界温度均集中在T↓ = 254 K和T↑ = 256 K，而两种材料的荧光强度呈现出与自旋交叉过程严格同步的温度函数，这表明以配体为中心的荧光受亚铁离子自旋态的支配。FeL-AD或FeL-PD中的双功能实体（自旋交叉中心和荧光团）显示出光谱带重叠，这支持了这种自旋交叉-荧光相关性的Förster共振能量转移机制。SCO材料的后合成修饰以及荧光与SCO之间的关系可能有助于开发对多种刺激敏感的多功能材料。
