We present an overview of very recent advances in the engineering of magnetic networks based on octacyanometalates. The selected magnetic networks of Cu^IIW^V, Ni^IIW^V and Mn^IILNb^IV (L – organic bridging linker) illustrate the possible strategies for tuning of the magnetic characteristics. The combination of magnetic ordering for 2D (two-dimensional) and 3D (three-dimensional) networks together with the solvent sensitivity of a cyano-bridged framework resulted in the development of a novel 3D {[Mn^II(imH)]₂[Nb^IV(CN)₈]} assembly with magnetic sponge character, characterized by T_c of 62 K, the highest ever observed for octacyanometalate-based networks.

The magnetocaloriceffect is considered as an energy-efficient and environmentally friendly technique which can take cooling technology to the next level. Apart from its commercial application at room temperature, magnetic refrigeration is an up-and-coming solution for the cryogenic regime, especially as an alternative to He³ systems. Molecular magnets reveal advantageous features for ultra-low cooling which are competitive with intermetallic and lanthanide alloys. Here, we present a guide to the current status of magnetocaloric effect research of molecular magnets with a theoretical background focused on the inverse magnetocaloric effect and an overview of recent results and developments, including the rotating magnetocaloric effect.