Photophysical study of a charge transfer oxazole dye in micelles: Role of surfactant headgroups

Maiti, Jyotirmay; Sarkar, Yeasmin; Parui, Partha Pratim; Chakraborty, Sandipan; Biswas, Suman; Das, Ranjan

doi:10.1016/j.jlumin.2015.02.054

Cited by 9 publications

(12 citation statements)

References 45 publications

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“…Therefore, the surface polarity increases from anionic to cationic to non‐ionic micelles . Accordingly, the non‐radiative deactivation rate decreases and the fluorescence quantum yield increases . All fluorescence lifetime values obtained were single‐exponential.…”

Section: Resultsmentioning

confidence: 94%

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Photophysical and photodynamic properties of Pyronin Y in micellar media at different temperatures

2019

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In this study, photophysics and photodynamical properties of Pyronin Y (PyY) in different liquid media were investigated. Interactions of PyY, which is a positively charged pigment compound pertaining to the xanthene derivatives with surfactants possessing distinct charges, were determined by using the molecular absorption and fluorescence spectroscopy techniques. It was observed that band intensities of absorption and fluorescence spectra belonging to PyY increase in proportion to the water when compared to three micelle systems, cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS) and Triton X-100 (TX-100). This suggests that interactions in micelle systems are different from those in deionized water, and solvation and surface interactions modify. It is determined that the strongest interaction occurs between PyY dye and SDS, anionic surfactant, and this interaction arises from the electrostatic forces. Calculated photophysical parameters indicated that the microenvironment of PyY in SDS micelle is different to that of other systems. In temperature studies, it was reported that increasing the temperature of the samples increased non-radiative transitions. Steady-state fluorescence anisotropy values were calculated by using fluorescence intensities of PyY compound in pre-micellar, micellar and post-micellar systems. Once the PyY fluorescence probe is added to the surfactant containing solutions below the critical micelle concentrations, the measured anisotropy values were found to be low because the probe remains in the deionized water phase. When the surfactant concentration of the medium becomes closer to the critical micelle concentrations, the steady-state anisotropy value prominently increases. This is because of the restrictions on the rotational diffusion of the probe in micellar solution. It is observed that positively charged PyY shows a higher affinity to the negatively charged SDS compared with the positively charged CTAB and neutral TX-100 surfactants. This can be explained by Coulombic interactions.

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Section: Resultsmentioning

confidence: 94%

“…When the microviscosity values of the other micelles were examined, it was determined that the smallest values were in the TX‐100 micelle. This means that the interaction between the PyY molecule and the uncharged TX‐100 surfactant is very weak …”

Section: Resultsmentioning

confidence: 99%

Photophysical and photodynamic properties of Pyronin Y in micellar media at different temperatures

2019

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“…It is to be noted that, due to two different kinds of interaction displayed by TB in different micellar stages, two different equations have been used to determine the association constant of TB to the pre micellar (>8 mM) and the micellar stage (8 mM) of SDS. For the interaction of TB with SDS in the pre micellar stage, the intensity gradually decreases due to the formation of ion‐pair complex (Figure 1) where the nonradiative process of electron transfer from TB to micelle is predominant [25] . This interaction can be modelled by the Stern Volmer Equation (equation 12).…”

Section: Methodsmentioning

confidence: 99%

“…For the interaction of TB with SDS in the pre micellar stage, the intensity gradually decreases due to the formation of ion-pair complex (Figure 1) where the nonradiative process of electron transfer from TB to micelle is predominant. [25] This interaction can be modelled by the Stern Volmer Equation (equation 12). However, in the micellar stage of SDS, as all the TB molecules are compartmentalized within the nonpolar core of micelles and are screened from the non-radiative processes which is predominant in bulk water, an enhancement of fluorescence intensity has been observed which has been modelled by the Benesi-Hildebrand equation (equation 13).…”

Section: Fitting Equation To Determine the Binding Constant Of Tb To ...mentioning

confidence: 99%

Host‐Assisted Delivery of a Model Drug to Genomic DNA: Key Information from Ultrafast Spectroscopy and in silico Study

et al. 2022

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Drug delivery to a target without adverse effects is one of the major criteria for clinical use. Herein, we have made an attempt to explore the delivery efficacy of SDS surfactant in a monomer and micellar stage during the delivery of the model drug, Toluidine Blue (TB) from the micellar cavity to DNA. Molecular recognition of pre‐micellar SDS encapsulated TB with DNA occurs at a rate constant of k1 ∼652 s−1. However, no significant release of encapsulated TB at micellar concentration was observed within the experimental time frame. This originated from the higher binding affinity of TB towards the nano‐cavity of SDS at micellar concentration which does not allow the delivery of TB from the nano‐cavity of SDS micelles to DNA. Thus, molecular recognition controls the extent of DNA recognition by TB which in turn modulates the rate of delivery of TB from SDS in a concentration‐dependent manner.

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“…The uorescence lifetime (s 3 ) of ACYMAN becomes signicantly large in pure DODAB vesicles (2.82 ns) relative to aqueous buffer (average lifetime $ 0.34 ns), and originates from inhibition of non-radiative relaxation of the excited charge transfer (CT) state due to efficient screening of the dye from perturbation of water molecules. 26 In addition, upon an increase of the a Amplitude or intensity fraction of each decay component is shown within parentheses. MO content (c MO ) gradual increase of the uorescence lifetime (s 3 ) is observed in DODAB/MO mixed vesicles (Table 1) relative to pure DODAB vesicles because of increasingly more efficient screening of the dye from perturbation of water molecules in the former than the latter.…”

Section: Scheme 1 Dodab (A) Mo (B) and Acyman (C)mentioning

confidence: 99%

Probing relaxation dynamics of a cationic lipid based non-viral carrier: a time-resolved fluorescence study

Singh

Mukherjee

Singha³

et al. 2019

RSC Adv.

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Photophysical study of a charge transfer oxazole dye in micelles: Role of surfactant headgroups

Cited by 9 publications

References 45 publications

Photophysical and photodynamic properties of Pyronin Y in micellar media at different temperatures

Photophysical and photodynamic properties of Pyronin Y in micellar media at different temperatures

Host‐Assisted Delivery of a Model Drug to Genomic DNA: Key Information from Ultrafast Spectroscopy and in silico Study

Probing relaxation dynamics of a cationic lipid based non-viral carrier: a time-resolved fluorescence study

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