Large negative magneto-LC effects induced by racemic dimerization of liquid crystalline nitroxide radicals with a terminal cyano group

Abstract

Large negative magneto-LC effects occur in the LC phase of a racemate of a chiral nitroxide radical with a terminal cyano group.

Strong Aggregation‐Induced CPL Response Promoted by Chiral Emissive Nematic Liquid Crystals (N*‐LCs)

“…The detailed preparation processo fN *-LCs from E7 is described in the Experimental Section5.T he N*-LCs exhibit liquid crystallinity and typical planar Grandjean textures as shown in Figure 3a nd Figure S4, which can be attributed to both dipolar interactions from polar cyano groups and p-p interactions between binaphthyl moiety( R/S-BINOL-CN) and biphenyl/terphenyl groups of the host E7. [21] The mixtures of cyanobiphenyl and cyanoterphenyl compounds of E7 host can effectively enhance such kind of attraction between the host and the dopant of R/S-BINOL-CN containing dicyano-vinyl group, which can form the spontaneous self-assembly with sufficient compatibility, enough fluidity and chirall iquid crystallinity.A si se vident from Figure 3, there is great difference from the POM textures of nematic LC E7 and the chiral N * -LC of the mixture E7 doped with 1wt% R-BINOL-CN in af lat LC cell. At ypicalp lanar Grandjean texture demonstrates the conformationo fanew N * -LC phase (Figure 3 b), which spontaneously aligns to form ah elicallyt wisted structure.…”

Orientation of 4-n-octyl-4′-cyanobiphenyl molecules on graphene oxide surface via electron–phonon interaction and its applications in nonlinear electronics

“…25 and 26 provide new track to investigate the orientational interactions between the LC molecules and the GO flakes in accordance with the role of functional groups. Most recently, Uchida et al 27 . have shown that if cyano (CN) group is present at the terminal position of a LC compound, it causes specific negative magneto−LC effects.…”

Cr3+‐Cr3+ Ion Pair Induced Fast Energy Migration in Cr3+ Doped Na‐β‐Al2O3 Ultra‐Wide Near‐Infrared Phosphors for NIR Spectroscopy Application

“…According to relevant literature reports, [14] the EPR signals of Cr 3+ can be observed in the magnetic field range 0 G < B < 6000 G. The signals in the green and blue shadows, belong to the isolated Cr 3+ signal in octahedral sites and the Cr 3+ -Cr 3+ electron exchange coupling pair, respectively. The EPR signals of the isolated Cr 3+ can be fitted into two wide peaks by the Voigt function (Figure 3i), [14,17] and with the increase of Ga 3+ ratio, the maximum value of the spectral splitting factor geff changes from 4.991 to 4.061. These results indicate that the Cr 3+ can occupy two isolated octahedral sites in the samples.…”