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Updated: Jun 24, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Influence of solute-solvent hydrogen bonding on intramolecular magnetic exchange interaction in aminoxyl diradicals:
Md Ehesan Ali1, Peter M Oppeneer, Sambhu N Datta
1Department of Physics, Uppsala University, Box 530, SE-75121 Uppsala, Sweden. ehesan.ali@fysik.uu.se
Abstract:
We have investigated the effect of nitroxide radical-water hydrogen bonding (NO(*)...H(2)O) on the intramolecular magnetic exchange interaction (J) for biologically relevant aminoxyl diradicals. We adopt a combination of broken-symmetry density functional theory and the quantum mechanics/molecular mechanics (QM/MM) approach. We find that the presence of hydrogen bonding reorients the radical spin density on -NO(*). This phenomenon reduces the effective distance between the two interacting localized spin centers that eventually increases the intramolecular magnetic exchange interaction. We have also investigated the functional variation of the magnetic exchange interaction, using various GGA (BLYP, PBE, HCTH407), meta-GGA (TPSS, VXSC), and hybrid (O3LYP, B3LYP, B3P86, B3PW91, and PBE0) functionals.
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