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Abstract <p>Stable nanoparticles capable of experiencing spin crossover with hysteresis on curves of the µ<sub>eff</sub>(<i>T</i>) dependence near ambient temperature have been synthesized. The earlier synthesized complexes [Fe(NH<sub>2</sub>trz)<sub>3</sub>]Cl<sub>2</sub>·H<sub>2</sub>O and [Fe(NH<sub>2</sub>trz)<sub>3</sub>]Br<sub>2</sub>·H<sub>2</sub>O exhibiting sharp spin crossover with hysteresis are used for the preparation of the nanocomposites. Few-layer graphene (FLG) formed by the microwave heating of the intercalated polydicarbonfluoride compound with acetone served as the basis. Nanoparticles Fe(NH<sub>2</sub>trz)<sub>3</sub>Cl<sub>2</sub>@FLG (SCO1-<i>n</i>) and Fe(NH<sub>2</sub>trz)<sub>3</sub>Br<sub>2</sub>@FLG (SCO2-<i>n</i>) (<i>n</i> = 1–3) have been prepared (<i>n</i>&#xa0;indicates time (h) of the treatment of the initial particles with ultrasound). The effective hydrodynamic diameter of particles of the complexes in ethanol is determined by photon correlation spectroscopy. The structures and microstructures of the samples are studied by high resolution transmission electron microscopy. The study of the µ<sub>eff</sub>(<i>T</i>) dependence shows that all synthesized composites exhibit crossover with hysteresis on the µ<sub>eff</sub>(<i>T</i>) curves. The temperature and character of the transition depend substantially on the particle size. The variation of the ultrasonication time during the preparation of the composites makes it possible to purposefully modify their magnetic properties.</p>

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Spin Crossover–Few-Layer Graphene Nanocomposites: Synthesis and Magnetic Properties of Fe(NH2trz)3A2@FLG (A = Cl–, Br–)

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • L. G. Lavrenova,
  • V. G. Makotchenko,
  • E. V. Korotaev,
  • E. Yu. Gerasimov,
  • A. I. Bulavchenko,
  • O. G. Shakirova

摘要

Abstract

Stable nanoparticles capable of experiencing spin crossover with hysteresis on curves of the µeff(T) dependence near ambient temperature have been synthesized. The earlier synthesized complexes [Fe(NH2trz)3]Cl2·H2O and [Fe(NH2trz)3]Br2·H2O exhibiting sharp spin crossover with hysteresis are used for the preparation of the nanocomposites. Few-layer graphene (FLG) formed by the microwave heating of the intercalated polydicarbonfluoride compound with acetone served as the basis. Nanoparticles Fe(NH2trz)3Cl2@FLG (SCO1-n) and Fe(NH2trz)3Br2@FLG (SCO2-n) (n = 1–3) have been prepared (n indicates time (h) of the treatment of the initial particles with ultrasound). The effective hydrodynamic diameter of particles of the complexes in ethanol is determined by photon correlation spectroscopy. The structures and microstructures of the samples are studied by high resolution transmission electron microscopy. The study of the µeff(T) dependence shows that all synthesized composites exhibit crossover with hysteresis on the µeff(T) curves. The temperature and character of the transition depend substantially on the particle size. The variation of the ultrasonication time during the preparation of the composites makes it possible to purposefully modify their magnetic properties.