N@C60–Porphyrin: A Dyad of Two Radical Centers
journal contributionposted on 01.02.2012, 00:00 by Guoquan Liu, Andrei N. Khlobystov, Georgios Charalambidis, Athanassios G. Coutsolelos, G. Andrew D. Briggs, Kyriakos Porfyrakis
Dyads of endohedral nitrogen fullerene and porphyrin have been synthesized. In the two-radical-center dyad, the copper(II) tetraphenylporphyrin suppressed the electron spin resonance (ESR) signal of N@C60 through intramolecular dipolar coupling with a strength of 27.0 MHz. Demetalation of the metalloporphyrin moiety of the dyad, which effectively turned the two-radical-center dyad into a single-radical-center dyad, recovered 82% of the ESR signal of N@C60. Such mechanism of switching a spin state on and off could find use in molecular spintronics applications.