Magnetically ordered molecule-based materials

Magnets composed of molecular components that provide both electron spins and spin-coupling pathways can stabilize bulk magnetic ordering. This was first reported for the ionic, zero-dimensional (0-D) electron transfer salt [Fe(C5Me5)(2)](+)[TCNE](center dot-) (TCNE = tetracyanoethylene), which orders as a ferromagnet at T-c = 4.8 K. Later V[TCNE](x) (x similar to 2) was characterized to order above room temperature at 400 K (127 degrees C). Subsequently, numerous examples of organic-and molecule-based magnets have been characterized. In this critical review, after a discussion of the important aspects of magnetism pertaining to molecule-based magnets, including the determination of the magnetic ordering temperature (T-c) these magnetically ordered materials are reviewed from a perspective of the structural dimensionality (208 references).