Normal & reversed spin mobility in a diradical by electron-vibration coupling

Yi Shen, Guodong Xue, Yasi Dai, Sergio Moles Quintero, Hanjiao Chen, Dongsheng Wang, Fang Miao (), Fabrizia Negri (), Yonghao Zheng () and Juan Casado ()
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Yi Shen: University of Electronic Science and Technology of China (UESTC)
Guodong Xue: University of Electronic Science and Technology of China (UESTC)
Yasi Dai: Università di Bologna, Dipartimento di Chimica ‘Giacomo Ciamician’
Sergio Moles Quintero: University of Málaga
Hanjiao Chen: Sichuan University
Dongsheng Wang: University of Electronic Science and Technology of China (UESTC)
Fang Miao: University of Electronic Science and Technology of China (UESTC)
Fabrizia Negri: Università di Bologna, Dipartimento di Chimica ‘Giacomo Ciamician’
Yonghao Zheng: University of Electronic Science and Technology of China (UESTC)
Juan Casado: University of Málaga

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract π−conjugated radicals have great promise for use in organic spintronics, however, the mechanisms of spin relaxation and mobility related to radical structural flexibility remain unexplored. Here, we describe a dumbbell shape azobenzene diradical and correlate its solid-state flexibility with spin relaxation and mobility. We employ a combination of X-ray diffraction and Raman spectroscopy to determine the molecular changes with temperature. Heating leads to: i) a modulation of the spin distribution; and ii) a “normal” quinoidal → aromatic transformation at low temperatures driven by the intramolecular rotational vibrations of the azobenzene core and a “reversed” aromatic → quinoidal change at high temperatures activated by an azobenzene bicycle pedal motion amplified by anisotropic intermolecular interactions. Thermal excitation of these vibrational states modulates the diradical electronic and spin structures featuring vibronic coupling mechanisms that might be relevant for future design of high spin organic molecules with tunable magnetic properties for solid state spintronics.

Date: 2021
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DOI: 10.1038/s41467-021-26368-8

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