Abstract
Metal-free liquid-crystalline (LC) materials consisting of a LC nitroxide radical compound exhibit light-induced reversible switching of the magnetic properties as a new photomagnetic effect. This behavior is based on the abrupt change of magnetic properties at the phase transition directly from a chiral smectic C phase to an isotropic liquid (Iso) phase. The origin of the abrupt change is probably the difference in the inhomogeneity of the intermolecular magnetic interactions between LC and Iso phases. To our knowledge, there are no existing reports on a material showing the reversible and quick phase transitions with the large difference of the inhomogeneity. Here we show a relatively simple way to design a compound to enlarge the difference between LC and Iso phases and to make the response quick and reversible. In addition, the presented analysis method that mines Gaussian components from electron paramagnetic resonance spectra enables us to precisely evaluate magnetic properties in condensed phases.
Highlights
Metal-free liquid-crystalline (LC) materials consisting of a LC nitroxide radical compound exhibit light-induced reversible switching of the magnetic properties as a new photomagnetic effect
Since the magnetic properties of the previously reported LC-NRs hardly change at the LC-to-isotropic liquid (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
Compounds (2S,5S)-8NO82 and (±)-8NO82 were prepared by the synthetic procedure shown in Supplementary Fig. 1 and characterized by high performance liquid chromatography (HPLC) analysis, infrared (IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and high resolution mass spectrometry (HRMS) (Supplementary Figs. 2–5)
Summary
Metal-free liquid-crystalline (LC) materials consisting of a LC nitroxide radical compound exhibit light-induced reversible switching of the magnetic properties as a new photomagnetic effect. An LC-NR with the forked structure could show high orientational and layer, that is 1-D positional, orders in LC phases that should induce the large abrupt change of magnetic properties at the LC-to-Iso phase transition.
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