Development of novel 2-dimensional materials with singular and thrilling properties has aroused large interest due to the novel unexpected applications that can be derived from there. In this sense, coordination polymers (CPs) have appeared as matching candidates thanks to their rational chem. design and the added-value properties given by the presence of metal ions. This is the case of switchable spin-crossover systems that are proposed as excellent candidates for data storage or sensing, among others. Here, the authors report the delamination of crystals of the 2-dimensional spin-crossover (SCO) [Fe(L1)2](ClO4)2∝ (1) (L1 = tris[2-(1H-tetrazol-1-yl)ethyl]amine) CP by liq.-phase exfoliation (LPE) in H2O. The application of this top-down technique gave flakes with controlled thicknesses, down to 1-2 nm thick (mostly mono- and bilayer), that retain the chem. compn. and SCO interconversion of the bulk material. Also, these flakes can be handled as stable colloidal dispersions for many days. This allows for a controlled transfer to solid substrates and the formation of thermochromic polymeric films as a proof-of-concept of device. These 1st results will definitely open new venues and opportunities for the study and future integration of these original switchable 2-dimensional materials in devices.