A Stable and Sensitive Organic-Inorganic Hybrid Reversible Thermochromic Material: [1-(2-Fluoroethyl)Piperazine]2[CuCl4]

Abstract

In this study, we successfully developed a series of organic-inorganic hybrid reversible thermochromic materials. Through the precise modification of the crystal [FEtPZ]CuCl4, the thermochromic temperature range was significantly broadened, and the significance and stability of its color change were enhanced, effectively overcoming the limitations of traditional reversible thermochromic materials such as narrow color change range, low sensitivity, and instability to ultraviolet rays. Through UV-visible spectroscopy analysis, we observed a significant red shift of the absorption peak of the crystal during the temperature increase. This change was highly consistent with the thermochromic behavior of the material from yellow to orange-black. Further structural analysis indicated that the thermochromic behavior of the crystal [FEtPZ]CuCl4 mainly originated from the lattice expansion effect. Due to its significant thermochromic phenomenon and unique optical properties, [FEtPZ]CuCl4 shows broad application prospects in the fields of information encryption and anti-counterfeiting. This study not only provides new ideas for the performance optimization of thermochromic materials but also offers an efficient and reliable solution for the field of intelligent anti-counterfeiting.