MAGNETICALLY SENSITIVE NONPOLAR EXCIPLEX - THE PERFLUORONAPHTHALENE-ANTHRACENE SYSTEM

The complexation reaction between anthracene (AN) and perfluoronaphtha lene (PFN) has been found to be magnetically sensitive. The various ch aracteristics of magnetic field effect in the radical ion pair system, namely wavelength, field and dielectric constant dependence, were inv estigated. The mismatch between theoretically estimated and experiment ally determined B-1/2, has been ascribed to the out-of-plane floppy mo tion of the perfluoranaphthalene radical anion. which bestows a sigma character on the latter thereby affecting the hyperfine coupling const ant. The low magnetic sensitivity of this exciplex system has been asc ribed to a combined effect of static complexation of AN-PFN and an our -of-plane butterfly motion of the PFN radical. (C) 1997 Elsevier Scien ce B.V.