Negative magneto-resistance observed on an ion-radical salt of a TTF-based spin-polarized donor

A novel diselena analogue of TTF-based spin-polarized donor was synthesized. An ion-radical salt of the donor electro-crystallized on an interdigitated electrode with 2 mu m gap showed negative magneto-resistance below 15 K. This is the first example detecting the interaction between localized spin and conducting electron in a genuine organic system.