Achieving large thermal hysteresis in an anthracene-based manganese(II) complex via photo-induced electron transfer

Ji-Xiang Hu, Qi Li, Hai-Lang Zhu, Zhen-Ni Gao, Qian Zhang, Tao Liu () and Guo-Ming Wang ()
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Ji-Xiang Hu: Qingdao University
Qi Li: Qingdao University
Hai-Lang Zhu: Dalian University of Technology
Zhen-Ni Gao: Qingdao University
Qian Zhang: Qingdao University
Tao Liu: Dalian University of Technology
Guo-Ming Wang: Qingdao University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Achieving magnetic bistability with large thermal hysteresis is still a formidable challenge in material science. Here we synthesize a series of isostructural chain complexes using 9,10-anthracene dicarboxylic acid as a photoactive component. The electron transfer photochromic Mn2+ and Zn2+ compounds with photogenerated diradicals are confirmed by structures, optical spectra, magnetic analyses, and density functional theory calculations. For the Mn2+ analog, light irradiation changes the spin topology from a single Mn2+ ion to a radical-Mn2+ single chain, further inducing magnetic bistability with a remarkably wide thermal hysteresis of 177 K. Structural analysis of light irradiated crystals at 300 and 50 K reveals that the rotation of the anthracene rings changes the Mn1–O2–C8 angle and coordination geometries of the Mn2+ center, resulting in magnetic bistability with this wide thermal hysteresis. This work provides a strategy for constructing molecular magnets with large thermal hysteresis via electron transfer photochromism.

Date: 2022
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DOI: 10.1038/s41467-022-30425-1

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