A molecule-based nanoporous material showing tuneable spin-crossover behavior near room temperature

A Fe-II-based 1D open framework that exhibits room-temperature spin-crossover (SCO) is reported. This material shows a reversible structural, magnetic, and chromatic response to a sorption/desorption process, allowing the tuning of the spin-transition properties by choosing the appropriate solvent (see figure). This feature represents the first example of a bifunctional material in which host-guest properties directly influence the SCO properties.