The goal of this paper is to emphasize the multidisciplinary character of molecular magnetism as a whole, and of our own activity in this field. For that, we have briefly described some of our results concerning the theoretical simulation of thermodynamical properties of molecular magnetic materials, the study of spin density maps, and the synergy between optical (or photophysical) and magnetic properties. We have also reported on two new chain compounds exhibiting dominant ferromagnetic interactions, one involving transition metal ions, the other one involving organic radicals.