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


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.

SUBMITTER: Shen Y 

PROVIDER: S-EPMC8556253 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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

Shen Yi Y   Xue Guodong G   Dai Yasi Y   Quintero Sergio Moles SM   Chen Hanjiao H   Wang Dongsheng D   Miao Fang F   Negri Fabrizia F   Zheng Yonghao Y   Casado Juan J  

Nature communications 20211029 1


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 distributi  ...[more]

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