Electron donor--bridge--acceptor molecules with bridging nitronyl nitroxide radicals: Influence of a third spin on charge- and spin-transfer dynamics

Appending a stable radical to the bridge molecule in a donor--bridge--acceptor system (D-B-A) is potentially an important way to control charge- and spin-transfer dynamics through D-B-A. Using both time-resolved optical and EPR spectroscopy, it is shown that nitronyl nitroxide (NN*) influences the spin dynamics of the photogenerated triradical states (super 2,4)(MeOAn-6ANI-Ph(NN*)-(super 3*)NI), in which NN* is strongly spin-polarized.