Manipulating Selective Metal‐to‐Metal Electron Transfer to Achieve Multi‐Phase Transitions in an Asymmetric [Fe
<sub>2</sub>
Co]‐Assembled Mixed‐Valence Chain
作者:Nian‐Tao Yao、Liang Zhao、Cheng Yi、Qiang Liu、Ya‐Ming Li、Yin‐Shan Meng、Hiroki Oshio、Tao Liu
DOI:10.1002/anie.202115367
日期:2022.3.7
AbstractManipulation of multi‐functions in molecular materials is promising for future switching and memory devices, although it is currently difficult. Herein, we assembled the asymmetric Fe2Co} unit into a cyanide‐bridged mixed‐valence chain [(Tp)Fe(CN)3]2Co(BIT)} ⋅ 2CH3OH (1) (Tp=hydrotris(pyrazolyl)borate and BIT=3,4‐bis‐(1H‐imidazol‐1‐yl)thiophene), which showed reversible multi‐phase transitions accompanied by photo‐switchable single‐chain magnet properties and a dielectric anomaly. Variable‐temperature X‐ray structural studies revealed thermo‐ and photo‐induced selective electron transfer (ET) between the Co and one of the Fe ions. Alternating‐current magnetic susceptibility studies revealed that1displayed on and off single‐chain magnet behavior by alternating 946‐nm and 532‐nm light irradiation. A substantial anomaly in the dielectric constant was discovered during the electron transfer process, which is uncommon in similar ET complexes. These findings illustrate that1provided a new platform for multi‐phase transitions and multi‐switches adjusted by selective metal‐to‐metal ET.