Unlocking room-temperature bistable spin transition at the nanoscale: the synthesis of core@shell [Fe(NHtrz)(NO)]@SiO nanoparticles.

In this work, we address the synthesis of stable spin-crossover nanoparticles capable of undergoing a hysteretic spin transition at room temperature. For this purpose, we use the reverse-micelle protocol to prepare naked [Fe(NHtrz)](NO) and core@shell [Fe(NHtrz)](NO)@SiO nanoparticles. Through meticulous adjustment of synthetic parameters, we achieved nanoparticle sizes ranging from approximately 40 nm to 60 nm.