Relevance of SOMO-HOMO inversion in the antioxidant activity of MgSO4-OH radical complex: A theoretical insight

IF 3.1 3区 化学 Q3 CHEMISTRY, PHYSICAL Chemical Physics Letters Pub Date : 2025-01-17 DOI:10.1016/j.cplett.2025.141902
Miguel Fernández , Reinaldo Marín , Morella Sánchez , Fernando Ruette
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Abstract

MgSO4 has been of great interest for its antioxidant properties. Its ion pairs were capable of transforming the OH radical (OH) by a spin-electron transfer from SO42− to OH besides the formation of a Mg2+…OH bond. Molecular and natural orbital of conformations are explored to analyze the SOMO-HOMO inversion (SHI) behavior related to the spin-electron transfer mechanism. An orbital scheme for the spin-electron transfer and SHI is proposed. Natural orbitals showed the formation of a partial O-O bond in the sulfate that stabilized the SO4 radical. The antioxidant capacity of MgSO4 is explained by spin-electron delocalization of unpaired electron.

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SOMO-HOMO倒置与MgSO4-OH自由基复合物抗氧化活性的相关性:理论见解
MgSO4因其抗氧化性能而受到广泛关注。它的离子对除了形成Mg2+…OH -键外,还能通过自旋电子从SO42 -转变为OH自由基(OH -)。探索了分子和自然构象轨道,分析了与自旋电子转移机制相关的SOMO-HOMO反转(SHI)行为。提出了自旋电子转移和SHI的轨道格式。自然轨道表明硫酸盐中形成了部分O-O键,稳定了SO4−自由基。MgSO4的抗氧化能力可以用未配对电子的自旋电子离域来解释。
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来源期刊
Chemical Physics Letters
Chemical Physics Letters 化学-物理:原子、分子和化学物理
CiteScore
5.70
自引率
3.60%
发文量
798
审稿时长
33 days
期刊介绍: Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage. Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.
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