Observation of biradical spin coupling through hydrogen bonds
arXiv:2205.02173 · doi:10.1103/PhysRevLett.128.236401
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-HO hydrogen bonds, as elucidated from analysis combining density functional theory calculation and a modern version of valence bond theory.
arXiv comment10 pages with supplemental materials, PRL accepted
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