A room temperature ferrimagnet, vanadium[pentafluorophenyltricyanoethylene]2

The emergence of the soft ferrimagnet V[TCNE]2 has sparked interest in the development of new radical anionic bridged magnets that are ordered above room temperature. Reversible one-electron acceptors 2-(phenyl)-1,1,2-tricyanoethylene, H5PTCE, and 2-(pentafluorophenyl)-1,1,2-tricyanoethylene, F5PTCE, are replacements for TCNE, giving magnets in reactions with V(CO)6 that order at 215 K and 307 K, respectively. Both compounds exhibit hysteresis with small coercivities at 5 K which is typical of this class of compounds.

Graphical abstractAnalogs of the V[TCNE]2 ferrimagnet were synthesized by replacing the TCNE with H5PTCE and F5PTCE in order to gain insight as to the reason why small changes in structure give different ordering temperatures. These molecule-based magnets, V[H5PTCE]2 and V[F5PTCE]2, exhibit Tcs of around 215 K and 307 K, respectively.Figure optionsDownload full-size imageDownload as PowerPoint slide