Magnetic properties of terminal iodinated nitroxide radical liquid crystals

Photomagnetic effects in metal-free liquid crystals

“…It had been natural that magnetic properties of metal-free compounds are undetectably weak in hightemperature LC phases unlike the above-mentioned properties until some metal-free LC compounds with a stable nitroxide radical moiety in the mesogen core or as one of the terminal groups (LC-NRs) were reported to exhibit the detectable change in magnetic properties at their melting points (Fig. 1a) [11][12][13][14][15][16][17][18][19] .…”

“…The difference in the inhomogeneity of the interactions is likely to result in that in the magnetic properties. Since crystalline (Cr) phases have uniform intermolecular interactions, whereas Fl phases have the most inhomogeneous ones 13,14 , the abrupt large changes of magnetic properties occur only at Cr-to-Fl phase transitions thus far [13][14][15]17,18 . However, such transitions from or to Cr phases are usually irreversible and/or too slow.…”

“…1b). However, since the magnetic properties of the previously reported LC-NRs hardly change at the LC-to-Iso phase transitions [12][13][14][15][16][17][18][19] , we have to design a new compound showing the large change of magnetic properties at the LC-to-Iso phase transitions to realize the light-induced reversible switching.…”