Raman spectroelectrochemical study of Toluidine Blue, adsorbed and electropolymerized at a gold electrode

Manifestation of intermolecular interactions in FTIR spectra of methylene blue molecules

“…The intense band with the peak at 1626 cm -1 corresponds to the C=N and C=C vibrations of MB heterocycle [7,25,26,30,31,46,47,62]. The two pronounced peaks at 1559 and 1541 cm -1 correspond to the C-N and C-C vibrations of the MB heterocycle [18,23,25,27,[51][52][53]. In the lower-frequency region the FTIR spectrum becomes complicated due to noticeable rotational structure.…”

Raman spectroelectrochemical study of Meldola blue, adsorbed and electropolymerized at a gold electrode

“…Earlier, we studied with the use of Raman spectroelectrochemical techniques redox processes occurring at electrodes, modified with adsorbed or electropolymerized layers of similar redox mediators toluidine blue [30,31] and neutral red [32,33]. The present work is a Raman spectroelectrochemical study of Meldola blue, adsorbed and electropolymerized at a gold electrode.…”

Raman spectroelectrochemical study of electrochemical decomposition of poly(neutral red) at a gold electrode

“…Tentative interpretations of bands observed in resonance Raman spectra of NR using excitation wavelengths of 457.9 and 514.5 nm [23] and spectral assignments for other structurally similar azines-thionine, Nile blue, rhodamine 6G, and methylene blue adsorbed at gold, silver, or copper electrodes or colloidal particles-have been published previously [24][25][26][27]. Recently, we have analyzed the Raman spectrum of adsorbed and electropolymerized toluidine blue at gold electrodes [22]. In this work we have conducted theoretical modeling and Raman spec- trum calculations for the oxidized protonated form of NR by using the DFT method at the B3LYP level with the 6-311+G(d,p) basis set.…”

“…In this work we have conducted theoretical modeling and Raman spec- trum calculations for the oxidized protonated form of NR by using the DFT method at the B3LYP level with the 6-311+G(d,p) basis set. Assignments of the experimentally observed Raman bands based on previously published analysis of similar compounds [22][23][24][25][26][27] and calculations performed in this work are summarized in Table 1. Basically, the high frequency spectral region ranging from 1650 to 1300 cm À1 presents mainly skeletal ring stretching vibrations.…”

“…Calculations were done using 6-311+G(2d,p) basis set. Calculated frequencies were scaled as described in previous publications [21,22].…”