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

Engineering and Applied Sciences

“…On the other hand, the formation of fluorescent H-aggregates was further corroborated by the variation of absorption and fluorescence peak intensity dependent on the experimental working concentration and pH. In particular, pH-dependent absorption and emission spectra for a fixed concentration of Rhodamine B in solvents reveal a red shift in the respective absorption and emission maxima (Radiul et al, 2023).…”

“…In a recent experimental study (Radiul et al, 2023), a previously undetected Rhodamine B fluorescence emission band was found, which is located between the spectral wavelength of 675 nm to 717 nm for the following solvents at ambient conditions: glycerol, ethylene glycol, methanol and butanol. Such a band is suggested, could be associated with the H-aggregates (H-dimer) of Rhodamine B and is confirmed by a blue-shifted band at 515 nm in the absorption spectra of Rhodamine B, in all solvents.…”

“…On the other hand, in the reactor chamber and due to the generation of compounds such as HNO3, HNO2, among other products that can be formed in moist air plasmas, there is a change in the pH of the solution (Fahmy et al, 2018;Shimizu et al, 2020;Alarcón et al, 2022a;Safenraider et al, 2020). It should be considered that the change in pH of the solution after being exposed to the plasma is a consequence of the treatment, however; it also contributes to the change in the absorbance value and the wavelength at which it is determined (Radiul et al, 2023).…”

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

“…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 .…”

The behavior of the pigment discoloration Permalon Rhodamine B 400% red in a liquid medium after exposure to a non-thermal plasma of different electrical power at atmospheric pressure

“…In a recent experimental study (Radiul et al, 2023), a previously undetected Rhodamine B fluorescence emission band was found, which is located between the spectral wavelength of 675 nm to 717 nm for the following solvents at ambient conditions: glycerol, ethylene glycol, methanol and butanol. Such a band is suggested, could be associated with H-aggregates (H-dimer) of Rhodamine B and is confirmed by a blue-shifted band at 515 nm in the absorption spectra of Rhodamine B, in all solvents.…”