Manifestation of intermolecular interactions in FTIR spectra of methylene blue molecules

Usage of FTIR-ATR as Non-Destructive Analysis of Selected Toxic Dyes

“…According to (25), the region of 1540 -1700 cm -1 became the most important for FTIR spectra of Methylene blue molecul (Figure 3). The weak band at 1660 -1714 cm -1 corresponds to the Chet = N + (CH3)2 stretching vibrations.…”

“…The absorption in the region at 1390 cm -1 is attributed to the symmetrical and asymmetrical bending vibrations of the CH3 functional groups of MB. Peak at 1334 cm -1 corresponds to the stretching vibrations of the C-N terminal saturated dimethylamino groups (25,26). The FTIR spectrum for the dye Naphtol green B (Figure 4) presents the characteristic bands of the sulfonate groups between 1352 and 798 cm -1 , in addition to the bands referring to the aromatic rings between 1603 and 1495 cm -1 , owing to the vibrations of naphthalene.…”

The influence of mesoporous silica modified with phosphorus and nitrogen‐containing hyperbranched molecules on thermal stability, combustion behavior, and toxic volatiles of epoxy resin

“…To verify the covalent functionalization of SH‐mSiO 2 with HPPA molecules, molecular structure of SH‐mSiO 2 , HPPA, and HPPA‐SH‐mSiO 2 hybrid was characterized by FTIR spectra in Figure . The characteristic band of S―H stretching vibration in pure SH‐mSiO 2 at 2565 cm −1 was absent in the spectrum of HPPA‐SH‐mSiO 2 hybrid . In the spectra of HPPA and HPPA‐SH‐mSiO 2 hybrid, 4 characteristic bands centered at 1724, 1635, 1410, and 806 cm −1 were assigned to acrylate groups.…”

“…The characteristic band of S-H stretching vibration in pure SH-mSiO 2 at 2565 cm −1 was absent in the spectrum of HPPA-SH-mSiO 2 hybrid. 30 In the spectra of HPPA and HPPA-SH-mSiO 2 hybrid, 4 characteristic bands centered at 1724, 1635, 1410, and 806 cm −1 were assigned to acrylate groups. Previous literatures have reported that the peaks at 1079 and 680 cm −1 are ascribed to the vibrational frequencies of C-S bond.…”

Propriedades Fotofísicas do Azul de Metileno Aplicadas para o Ensino de Espectroscopia UV-Visível como Ferramenta para Análise Qualitativa em Bioquímica

“…Dentre as estratégias pedagógicas apresentadas nesse OA está a simulação de condições que modulam a agregação do corante azul de metileno e o entendimento de como isso interfere qualitativamente nos espectros de absorção [2,3]. As condições moduladoras são concentração e uso de surfactantes.…”