The Nano-Confinement Effect on the SCO Behavior of [Fe(NH2trz)3](NO3)2 1D Chains in MCM-41

Crystals

Tian Zhao¹  Hexin Zhu¹  Ming Dong¹ 

[1] Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China;

关键词: spin-crossover;    MCM-41;    [Fe(NH₂trz)₃](NO₃)₂;    matrix effect;   

DOI  :  10.3390/cryst10080639

来源: DOAJ

【 摘 要 】

A polymeric chain spin-crossover (SCO) compound [Fe(NH₂trz)₃](NO₃)₂ was embedded in the pores of mesoporous silica MCM-41, which yielded an M@S composite. The obtained material was characterized by infrared spectrometry, powder X-ray diffractometry, gas sorption studies, electron microscopy, and atomic absorption. The temperature-induced SCO behavior of the composite was monitored by temperature-variable magnetic measurement. The results indicate that the spin transition curve of the composite was evidently shifted to a higher temperature in comparison to bulk [Fe(NH₂trz)₃](NO₃)₂. The shift in the transition temperature for M@S [versus bulk [Fe(NH₂trz)₃](NO₃)₂] amounted to T_c^↑ = 362 K [347 K] and T_c^↓ = 327 K [314 K] (magnetic data). The significant difference in the SCO behavior of [Fe(NH₂trz)₃](NO₃)₂ when embedded in the MCM-41 matrix may be attributed to the strengthened cooperativity of compound S and the nano-confinement pressure of SiO₂ walls.

【 授权许可】

Unknown