Spin crossover {[Fe(atrz) 3 ](OTs) 2 } n monolith: a green synthesis approach for Robust switchable materials.

This work presents a straightforward, room-temperature synthesis of a robust {[Fe(atrz) 3 ](OTs) 2 } n monolith. This approach offers a green alternative to traditional nanoparticle synthesis for manipulating spin crossover (SCO) behaviour. The monolith exhibits a more gradual SCO transition at lower temperatures compared to the bulk material, aligning with observations in smaller particle systems. Notably, the synthesis employs a solvent- and surfactant-free approach, simplifying the process and potentially reducing environmental impact, aligning with the principles of green chemistry.