Pj. Langley et al., Probing magnetic exchange interactions in molecular magnets: an inclusion compound of a dithiadiazolyl radical, J MAT CHEM, 9(7), 1999, pp. 1431-1434
Go-sublimation of the dithiadiazolyl radical, p-NCC6H4CNSSN2 with the inclu
sion-forming; host compound perhydrotriphenylene (PHTP) leads to trichroic
crystals of the host-guest complex [PHTP-2]. Molecules of 2 are linked thro
ugh a CN S interaction (ca. 3.03 Angstrom) to form polar chains within the
channels of the PHTP host lattice. The host-guest ratio is approximately 5:
1. Pyroelectric and non-linear optic responses indicate that crystals of.
[PHTP-2] are macroscopically polar. A combination of variable temperature s
olid state EPR spectroscopy and magnetic susceptibility measurements are us
ed to probe the electronic properties of[PHTP-2]; whilst [PHTP-2] is parama
gnetic, no exchange coupling between neighbouring molecules of 2 within the
channels could be established. The implications of these results on the ma
gnetic exchange pathway of the weak ferromagnet, beta-p-NCC6F4CNSSN beta-1,
are discussed.