Shao Dong, Shi Le, Yin Lei, Wang Bao-Lin, Wang Zhen-Xing, Zhang Yi-Quan, Wang Xin-Yi
State Key Laboratory of Coordination Chemistry , Collaborative Innovation Center of Advanced Microstructures , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing , 210023 , China . Email:
Wuhan National High Magnetic Field Centre , Huazhong University of Science and Technology , Wuhan , 430074 , China.
Chem Sci. 2018 Aug 27;9(41):7986-7991. doi: 10.1039/c8sc02774a. eCollection 2018 Nov 7.
The on-off switching of spin-crossover (SCO) and single-molecule magnetism (SMM) remains highly attractive, especially if it involves dynamic crystal-to-crystal transformation. Herein we report the first molecule, a mononuclear cobalt(ii) complex, that exhibits on-off switching between SCO and SMM reversibly during crystal-to-crystal transformation. Subtle structural transformation triggered by a simple dehydration-rehydration process induces significant geometrical changes of the Co center and modification of the supramolecular interactions and switches its colour and magnetic properties (dark red/SCO-on/SMM-off ↔ orange/SCO-off/SMM-on). This work suggests that modification of the weak supramolecular interactions could be very effective in achieving switchable materials involving both SCO and SMM properties.
自旋交叉（SCO）和单分子磁性（SMM）的开关切换仍然极具吸引力，特别是当它涉及动态的晶体到晶体转变时。在此，我们报道了首例分子，即一种单核钴（II）配合物，它在晶体到晶体转变过程中可逆地表现出SCO和SMM之间的开关切换。由简单的脱水 - 再水合过程引发的细微结构转变会导致钴中心发生显著的几何变化以及超分子相互作用的改变，并切换其颜色和磁性（深红色/SCO开启/SMM关闭 ↔ 橙色/SCO关闭/SMM开启）。这项工作表明，修饰弱超分子相互作用对于实现兼具SCO和SMM性质的可切换材料可能非常有效。
