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<p><?tk 4?>Anions containing sulfonate groups are widely used in the construction of spin crossover complexes. In this work, we synthesized a new Fe(II) salt, [Fe(H<sub>2</sub>O)<sub>6</sub>](2-As)<sub>2</sub>, featuring the anthracene-2-sulfonate (2-As⁻) anion, which can be used to study the influence of anion photodimerization on the spin state. Using this salt as a precursor, we obtained a Fe(II) mononuclear complex [Fe(3-bpp)<sub>2</sub>](2-As)<sub>2</sub>·2MeOH·H<sub>2</sub>O (<b>1</b>, 3-bpp = 2,6-di(pyrazol-3-yl)pyridine). <sup>57</sup>Fe Mössbauer spectroscopy and magnetic measurements revealed that <b>1</b> is in the low-spin state in its solvated form but undergoes a gradual and incomplete spin crossover upon desolvation, with a narrow thermal hysteresis around 290&#xa0;K.</p>

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Desolvation-driven thermal spin crossover in a Fe(II) complex incorporating the anthracene-2-sulfonate anion

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Mengmeng Wang,
  • Mariusz Wolff,
  • Jyoti Yadav,
  • Dawid Pinkowicz,
  • Yann Garcia

摘要

Anions containing sulfonate groups are widely used in the construction of spin crossover complexes. In this work, we synthesized a new Fe(II) salt, [Fe(H2O)6](2-As)2, featuring the anthracene-2-sulfonate (2-As⁻) anion, which can be used to study the influence of anion photodimerization on the spin state. Using this salt as a precursor, we obtained a Fe(II) mononuclear complex [Fe(3-bpp)2](2-As)2·2MeOH·H2O (1, 3-bpp = 2,6-di(pyrazol-3-yl)pyridine). 57Fe Mössbauer spectroscopy and magnetic measurements revealed that 1 is in the low-spin state in its solvated form but undergoes a gradual and incomplete spin crossover upon desolvation, with a narrow thermal hysteresis around 290 K.