Fluorescent H-aggregates of pure rhodamine B (RhB) in glycerol, ethylene glycol, methanol and butanol under ambient condition

Radiul, Seikh Mustafa; Chowdhury, Jugal; Hazarika, Simanta

doi:10.1016/j.molstruc.2022.134606

Cited by 7 publications

(1 citation statement)

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“…As shown in Figure S9, the characteristic peaks of RhB molecules in the composite films are significantly blue‐shifted compared to the neat RhB molecules, from 576 to 562 nm, indicating a H‐type π–π stacking arrangement between the RhB molecules in the assembles. [ 48 ] Further, vibrational circular dichroism (VCD) spectroscopy was used to check the chain conformation chirality. Figure 3B shows the VCD and IR information of the composite films, where the induced chiral information of LC‐BCP and RhB partially overlap with three parts (1) the chiral bands of the carbonyl group of the polymer ester group and the aromatic carboxyl group in RhB at 1768–1640 cm −1 , (2) the backbone vibration of the azobenzene functional group and the aromatic ring at 1620–1358 cm −1 showing strong chiral signals, (3) the asymmetric stretching vibration of the C−O−C bonds in LC‐BCP and the stretching vibrations of Ar−O−Ar in RhB backbone was observed at 1115–1283 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Large‐scale chiral spherulites with controllable circularly polarized luminescence in liquid crystal block copolymers film

Yuan,

Lu,

2023

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Macroscopic chiral spherulites prepared by hierarchical self‐assembly have attracted considerable attention due to their excellent property as chiroptical materials. However, preparing controllable chiral spherulites in bulk film remains a challenge due to the absent knowledge of the evolution mechanism from the molecule to macroscopic crystal during chiral assembly. In this contribution, chiral macroscopic spherulites were constructed with controllable circularly polarized luminescence (CPL) using enantiomeric tartaric acid and rhodamine B co‐assembled with liquid crystal block copolymers, poly(ethylene oxide)‐b‐poly(methyl methacrylate) bearing azobenzene group side chains. It was found that the chiral liquid crystal field induced by exogenous chiral molecules was closely related to the formation of macroscopic chiral spherulites. Moreover, the transformation of azobenzene cis‐trans isomerization under photo‐thermal endows films with adjustable CPL. This facile strategy provides a platform to design large‐scale chiral structures for chiroptical switching, encryption, and memory storage materials.

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Section: Resultsmentioning

confidence: 99%