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<p>We consider the preparation of film hybrid composite materials formed by a self-assembly process <i>via</i> the non-covalent interactions of surface functional groups and graphene domains of graphene oxide (GO) nanosheets with anionic spin-crossover complexes [Fe<sup>III</sup>(5Cl-thsa)<sub>2</sub>]<sup>−</sup> (5Cl-thsa<sup>2−</sup> is 5-chlorosalicylaldehyde thiosemicarbazone) and cations [Et<sub>4</sub>N]<sup>+</sup> of the intercalant salt [Et<sub>4</sub>N][Fe<sup>III</sup>(5Cl-thsa)<sub>2</sub>] (<b>1</b>). The introduction of salt <b>1</b> into the interlayer space of the GO nanosheets was observed for the first time, followed by the subsequent formation of a layered GO-<b>1</b> hybrid material film, while the reversible thermally induced spin transition was maintained. The GO-<b>1</b> hybrid material films were characterized by scanning electron microscopy, energy dispersive analysis, IR and Raman spectroscopy, and powder X-ray diffraction; their magnetic properties were studied. Comparative studies of the magnetic properties of complex <b>1</b> and the GO-<b>1</b> hybrid material film showed the influence of the GO nanosheet matrix on the nature and completeness of the spin transition of intercalant <b>1</b>. The semi-transition temperature of the GO-<b>1</b> hybrid material (<i>T</i><sub>½</sub> = 228 K) is shifted by ∼20 K towards the high-temperature region compared to that of the starting salt <b>1</b> (<i>T</i><sub>½</sub> = 208 K).</p>

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Film materials based on non-covalent hybrids of two-dimensional graphene oxide nanosheets with the spin-crossover molecular complex salt [Et4N][FeIII(5Cl-thsa)2]

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • N. G. Spitsyna,
  • M. A. Blagov,
  • A. I. Dmitriev,
  • N. N. Dremova,
  • M. V. Zhidkov,
  • S. V. Simonov,
  • A. S. Lobach

摘要

We consider the preparation of film hybrid composite materials formed by a self-assembly process via the non-covalent interactions of surface functional groups and graphene domains of graphene oxide (GO) nanosheets with anionic spin-crossover complexes [FeIII(5Cl-thsa)2]− (5Cl-thsa2− is 5-chlorosalicylaldehyde thiosemicarbazone) and cations [Et4N]+ of the intercalant salt [Et4N][FeIII(5Cl-thsa)2] (1). The introduction of salt 1 into the interlayer space of the GO nanosheets was observed for the first time, followed by the subsequent formation of a layered GO-1 hybrid material film, while the reversible thermally induced spin transition was maintained. The GO-1 hybrid material films were characterized by scanning electron microscopy, energy dispersive analysis, IR and Raman spectroscopy, and powder X-ray diffraction; their magnetic properties were studied. Comparative studies of the magnetic properties of complex 1 and the GO-1 hybrid material film showed the influence of the GO nanosheet matrix on the nature and completeness of the spin transition of intercalant 1. The semi-transition temperature of the GO-1 hybrid material (T½ = 228 K) is shifted by ∼20 K towards the high-temperature region compared to that of the starting salt 1 (T½ = 208 K).