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<p>A Ni(II) complex was obtained from the reaction of nickel chloride and 4,4′-trimethylenedipiperidinium chloride (H<sub>2</sub>TMDPCl<sub>2</sub>). Moreover, this thermochromic complex was embedded in silica hybrid material and characterized, as well. The present study is dealing with comparing the thermochromic behavior of this compound including phase transition temperature in these two situations. The thermochromic compound was synthesized by mechanochemical method, while, the composite was prepared by sol-gel method at room temperature. They both exhibit a yellow-to-blue color transition under heating. The samples have been subjected to multiple heating/cooling cycles and the dark blue color at elevated temperature fully reverses to the original green-yellow color upon cooling. In order to study the structure and the thermochromic behavior of the complex, Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), thermal analysis (TG/DTG/DSC), element analysis, X-ray diffraction (XRD) analysis were performed.</p>

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Preparation and characterization of thermochromic 4,4′-trimethylenedipiperidinium tetrachloronickelate complex and its silica hybrid composite

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Seyed Abolghasem Kahani,
  • Fatemeh Abdevali

摘要

A Ni(II) complex was obtained from the reaction of nickel chloride and 4,4′-trimethylenedipiperidinium chloride (H2TMDPCl2). Moreover, this thermochromic complex was embedded in silica hybrid material and characterized, as well. The present study is dealing with comparing the thermochromic behavior of this compound including phase transition temperature in these two situations. The thermochromic compound was synthesized by mechanochemical method, while, the composite was prepared by sol-gel method at room temperature. They both exhibit a yellow-to-blue color transition under heating. The samples have been subjected to multiple heating/cooling cycles and the dark blue color at elevated temperature fully reverses to the original green-yellow color upon cooling. In order to study the structure and the thermochromic behavior of the complex, Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), thermal analysis (TG/DTG/DSC), element analysis, X-ray diffraction (XRD) analysis were performed.