Abstract
Spin-crossover (SCO) metal complexes are expected to be widely used in data storage materials, display devices and sensors. Although a lot of spin-crossover photoswitches have been developed, the reversible photomodulation cases that work at room temperature are limited. Herein, a novel cobalt complex o-1-Co(II) wherein the salen unit bridges with bis-diarylethene has been designed as switch to construct “off-on” logic operation at room temperature. The complex o-1-Co(II) displays an abrupt, reversible and hysteretic spin crossover (T1/2↓=166 K, T1/2↑=177 K, and ΔT1/2=11 K) between the high-spin (HS) and low-spin (LS) states. Meanwhile, photocyclization of o-1-Co(II) with UV light produces a photoresponsive closed form c-1-Co(II), which always stays at low-spin without SCO at all. Moreover, the magnetic switching of the complex can also be achieved with redox reactions between Co(II) and Co(III).
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Acknowledgements
This work was supported by the National Natural Science Foundation of China for the Science Center Program (21788102), the Creative Research Groups (21421004) and Key Project (21636002), the National Natural Science Foundation of China (21905091), the Shanghai Municipal Science and Technology Major Project (Grant 2018SHZDZX03), the Innovation Program of Shanghai Municipal Education Commission, Scientific Committee of Shanghai (15XD1501400), the Program of Introducing Talents of Discipline to Universities (B16017), the Shanghai Pujiang Program (18PJ1402200) and China Postdoctoral Science Foundation (2019M651418).
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Wan, S., Li, M., Zhang, Z. et al. Reversible light-driven magnetic switching of salen cobalt complex. Sci. China Chem. 63, 1191–1197 (2020). https://doi.org/10.1007/s11426-020-9786-8
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DOI: https://doi.org/10.1007/s11426-020-9786-8