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<p>Spin crossover (SCO) is a reversible transition between high-spin (HS) and low-spin (LS) states. Hofmann-type complexes represent an important class of coordination polymers exhibiting this phenomenon. Mössbauer spectroscopy is a valuable tool for elucidating the local electronic and structural environments of specific elements. However, studies of Hofmann-type complexes using Mössbauer spectroscopy have primarily focused on <sup>57</sup>Fe, whereas investigations involving other elements remain limited. Herein, we synthesized two complexes, {Fe(Ethyl isonicotinate)<sub>2</sub>[Ni(CN)<sub>4</sub>]} and {Fe(Allyl isonicotinate)<sub>2</sub>[Ni(CN)<sub>4</sub>]}, and investigated them using <sup>61</sup>Ni Mössbauer spectroscopy. The Mössbauer spectra suggest a square-planar coordination geometry for the Ni sites and reveal structural flexibility around the Ni centers.</p>

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61Ni Mössbauer Spectroscopy on Hofmann-type complex {Fe(Ethyl isonicotinate)2[Ni(CN)4]}, {Fe(Allyl isonicotinate)2 [Ni(CN)4]}

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Kosuke Kitase,
  • Takafumi Kitazawa,
  • Shinji Kitao,
  • Takumi Kubota,
  • Yasuhiro Kobayashi,
  • Makoto Seto

摘要

Spin crossover (SCO) is a reversible transition between high-spin (HS) and low-spin (LS) states. Hofmann-type complexes represent an important class of coordination polymers exhibiting this phenomenon. Mössbauer spectroscopy is a valuable tool for elucidating the local electronic and structural environments of specific elements. However, studies of Hofmann-type complexes using Mössbauer spectroscopy have primarily focused on 57Fe, whereas investigations involving other elements remain limited. Herein, we synthesized two complexes, {Fe(Ethyl isonicotinate)2[Ni(CN)4]} and {Fe(Allyl isonicotinate)2[Ni(CN)4]}, and investigated them using 61Ni Mössbauer spectroscopy. The Mössbauer spectra suggest a square-planar coordination geometry for the Ni sites and reveal structural flexibility around the Ni centers.