Observation of biradical spin coupling through hydrogen bonds

• URL: http://arxiv.org/abs/2205.02173v1
• Date: Wed, 4 May 2022 16:44:38 GMT
• Title: Observation of biradical spin coupling through hydrogen bonds
• Authors: Yang He, Na Li, Ivano E. Castelli, Ruoning Li, Yajie Zhang, Xue Zhang, Chao Li, Bingwu Wang, Song Gao, Lianmao Peng, Shimin Hou, Ziyong Shen, Jing-Tao L\"u, Kai Wu, Per Hedeg{\aa}rd, Yongfeng Wang
• Abstract summary: Radical pairs of all-trans retinoic acid molecules on Au (111) are created using an ultra-low temperature scanning tunneling microscope. Antiferromagnetic coupling between two radicals is identified by magnetic-field dependent spectroscopy. The measured exchange energies are from 0.1 to 1.0 meV.
• Score: 16.459120339528322
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Investigation of intermolecular electron spin interaction is of fundamental importance in both science and technology.Here, radical pairs of all-trans retinoic acid molecules on Au(111) are created using an ultra-low temperature scanning tunneling microscope. Antiferromagnetic coupling between two radicals is identified by magnetic-field dependent spectroscopy.The measured exchange energies are from 0.1 to 1.0 meV. The biradical spin coupling is mediated through O-H$\cdots$O hydrogen bonds, as elucidated from analysis combining density functional theory calculation and a modern version of valence bond theory.

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