| Summary: | A polymeric chain spin-crossover (SCO) compound [Fe(NH<sub>2</sub>trz)<sub>3</sub>](NO<sub>3</sub>)<sub>2</sub> 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(NH<sub>2</sub>trz)<sub>3</sub>](NO<sub>3</sub>)<sub>2</sub>. The shift in the transition temperature for M@S [versus bulk [Fe(NH<sub>2</sub>trz)<sub>3</sub>](NO<sub>3</sub>)<sub>2</sub>] amounted to T<sub>c</sub><sup>↑</sup> = 362 K [347 K] and T<sub>c</sub><sup>↓</sup> = 327 K [314 K] (magnetic data). The significant difference in the SCO behavior of [Fe(NH<sub>2</sub>trz)<sub>3</sub>](NO<sub>3</sub>)<sub>2</sub> when embedded in the MCM-41 matrix may be attributed to the strengthened cooperativity of compound <b>S</b> and the nano-confinement pressure of SiO<sub>2</sub> walls.
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