Synthesis, structure and physical properties of donors containing a PROXYL radical

Abstract

We succeeded in the synthesis of several new donors containing a TTF moiety and a PROXYL radical within a single molecule for the development of magnetic conductors. We clarified the crystal structure and physical properties of these donors. The CV measurements revealed that both the donors showed one pair of one-electron reversible redox waves (E 1 1/2: +0.49 and +0.57 V vs. Ag/AgCl. respectively) and one pair of broad two-electron reversible redox waves (E 2 1/2: +0.89 and +0.92 V. respectively). ESR spectra of the donors indicated three absorption lines (g =2.0059, a N = 14.2 G) characteristic of the PROXYL radical. The donors 1 and 2 are paramagnetic and showed antiferromagnetic interaction (θ = -2.1 and -8.7 K, respectively).