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<p>Two mixed‑ligand Co<sup>II</sup>-based compounds, {[Co(QABS)<sub>2</sub>(4,4′-bipy)]·2EtOH}<sub>n</sub> (<b>1</b>) and [Co(QABS)<sub>2</sub>(2,2′-bipy)]·H<sub>2</sub>O (<b>2</b>), were synthesized from cobalt(II) nitrate and N‑2‑quinoxaline‑4‑aminobenzenesulfonamide (QABS) in the presence of the bidentate co‑ligands 4,4′‑bipyridine (4,4′-bipy) and 2,2′‑bipyridine (2,2′-bipy), respectively, featuring distinct coordination modes. Single‑crystal X‑ray diffraction (SC-XRD) reveals that compound <b>1</b> forms a one‑dimensional (1D) coordination chain, whereas compound <b>2</b> features a discrete mononuclear structure, demonstrating that the auxiliary ligand significantly influences the coordination assembly. Spectroscopic, thermal, and electrochemical analyses confirm their stability and redox responsiveness. Both compounds <b>1</b> and <b>2</b> exhibit catalytic activity for the oxidation of benzoin to benzil, highlighting the potential of QABS‑based Co(II) architectures as multifunctional coordination materials with tunable structural and catalytic properties.</p> Graphical Abstract <p></p>

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Synthese, Crystal Structure and Catalytic Oxidation Activity of Two Co(II)-Based Complexes with N-2-Quinoxaline-4-Amino-Benzenesulfonamide

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Zixuan Yang,
  • Yu-Xuan Wang,
  • Jin-Peng Xue,
  • Xing Li,
  • Yanhong Zhu

摘要

Two mixed‑ligand CoII-based compounds, {[Co(QABS)2(4,4′-bipy)]·2EtOH}n (1) and [Co(QABS)2(2,2′-bipy)]·H2O (2), were synthesized from cobalt(II) nitrate and N‑2‑quinoxaline‑4‑aminobenzenesulfonamide (QABS) in the presence of the bidentate co‑ligands 4,4′‑bipyridine (4,4′-bipy) and 2,2′‑bipyridine (2,2′-bipy), respectively, featuring distinct coordination modes. Single‑crystal X‑ray diffraction (SC-XRD) reveals that compound 1 forms a one‑dimensional (1D) coordination chain, whereas compound 2 features a discrete mononuclear structure, demonstrating that the auxiliary ligand significantly influences the coordination assembly. Spectroscopic, thermal, and electrochemical analyses confirm their stability and redox responsiveness. Both compounds 1 and 2 exhibit catalytic activity for the oxidation of benzoin to benzil, highlighting the potential of QABS‑based Co(II) architectures as multifunctional coordination materials with tunable structural and catalytic properties.

Graphical Abstract