Excited-state absorption of meso-tetrasulfonatophenyl porphyrin: Effects of pH and micelles

Corrêa, Daniel S.; Boni, Leonardo De; Parra, Gustavo G.; Misoguti, Lino; Mendonça, Cleber Renato; Borissevitch, Iouri; Zílio, Sérgio Carlos; Neto, N.M. Barbosa; Gonçalves, Pablo José

doi:10.1016/j.optmat.2015.01.047

Cited by 11 publications

(5 citation statements)

References 46 publications

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“…The highest values are observed close to 500 nm, reaching a maximum value of about 10 for TF porphyrin. It is interesting to mention that the values of the cross-section ratio observed for TF ( Figure 6(b) -dotted line) are very similar to those observed for protonated meso-tetrakis(p-sulphonatophenyl) porphyrin (TPPS 4 ) [36]. This remarkable increase in the cross-section absorption ratio, observed for protonated TF, suggests that protonation can be a strategy which could be applied in optical limiting devices.…”

Section: Resultssupporting

confidence: 75%

Influence of halogen atoms and protonation on the photophysical properties of sulfonated porphyrins

Boni

Monteiro

Mendonça

et al. 2015

Chemical Physics Letters

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Section: Resultssupporting

confidence: 75%

Influence of halogen atoms and protonation on the photophysical properties of sulfonated porphyrins

Boni

Monteiro

Mendonça

et al. 2015

Chemical Physics Letters

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“…These results are in agreement with the literature 46 and can be interpreted in accordance to Goutermanś four-orbital model, where the reduction of the Q-band structuration is an indicative of the porphyrin ring symmetry increase. 54 Protonation of porphyrins causes significant changes in the photophysical and nonlinear properties [46][47][48]55 and can be considered the first step toward molecular aggregation. 56 3.2.…”

Section: Resultsmentioning

confidence: 99%

“…Free-base TPPS molecules were purchased from Porphyrin Products Inc., and their molecular structure is presented in Figure . It is well-known that hydrogen atoms in the central ring of TPPS porphyrin can be protonated in an acid environment. − In particular, it has a p K value close to 5.0; i.e., it is in its nonprotonated form at pH values >6.0 and in a diprotonated one at pH < 4.5. The pH values and the protonation state can be adjusted by adding appropriate amounts of HCl or NaOH to the stock solution.…”

Section: Methodsmentioning

confidence: 99%

Use of Spectroscopic Techniques for Evaluating the Coupling of Porphyrins on Biocompatible Nanoparticles. A Potential System for Photodynamics, Theranostics, and Nanodrug Delivery Applications

et al. 2017

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Modern medicine has been searching for new and more efficient strategies for diagnostics and therapeutics applications. Considering this, porphyrin molecules have received great interest for applications in photodiagnostics and phototherapies, even as magnetic nanoparticles for drug-delivery systems and magnetic-hyperthermia therapy. Aiming to obtain a multifunctional system, which combines diagnostics with therapeutic functions on the same platform, the present study employed UV/vis absorption and fluorescence spectroscopies to evaluate the interaction between meso-tetrakis(p-sulfonatofenyl)porphyrin (TPPS) and maghemite nanoparticles (γ-FeO). These spectroscopic techniques allowed us to describe the dynamics of coupling porphyrins on nanoparticles and estimate the number of 21 porphyrins per nanoparticle. Also, the binding parameters, such as the association constants (K = 8.89 × 10 M) and bimolecular quenching rate constant (k = 2.54 × 10 M s) were obtained. These results suggest a static quenching process where the electrostatic attraction plays an essential role. The work shows that spectroscopic techniques are powerful tools to evaluate the coupling of organic molecules and nanoparticles. Besides, the system studied provides a relevant background for potential applications in bionanotechnology and nanomedicine, such as (1) nanodrug delivery system, (2) photodiagnostics/theranostics, and/or (3) a combined action of photodynamic and hyperthermia therapies, working in a synergetic way.

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“…Density Functional Theory Study of the Solvent Effects on Electronic Transition Energies… DOI: http://dx.doi.org/10.5772/intechopen.99613 ca. 550-575 nm and third one at 624 nm [65]. For the H 4 TSPP (at pH = 3), their triplettriplet absorption spectrum in the range of 450-700 nm displayed two relatively strong and one weak peaks.…”

Section: Solvent Dependence Of Tsppmentioning

confidence: 92%

Density Functional Theory Study of the Solvent Effects on Electronic Transition Energies of Porphyrins

Aydın¹

2022

Density Functional Theory - Recent Advances, New Perspectives and Applications

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We have calculated the solvent effects on the ground state and the lowest triplet state absorption spectra of meso-tetraphenylporphyrin (TPP), meso-tetrakis(p-sulfonatophenyl)porphyrin (TSPP) and their diprotonated forms (H4TPP and H4TSPP) in thirty-nine different solvent using time-dependent-DFT density functional theory (TD-DFT) coupled with CPCM method. The results of the calculations show that the Q-bands and Soret-bands (or B-bands) in the absorption spectra of these compounds substantially change as function of solvent dielectric constant (ε) up to 20.493 (acetone), but become stabile in high polar solvents with dielectric constants ε > 20. The relative shifts in the B-bands are more significant than that in the Q-bands. The magnitude of the shifts in the spectral position of the Q and B bands are in the following order: H4TSPP > H4TPP > TPP > TSPP for the B-bands and H4TSPP > H4TPP > TSPP > TPP for the Q-bands. We also have determined that the energy-gaps between the B/Q-bands and their nearest triplet states are also solvent dependent for ε < ~ 20.493.

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Excited-state absorption of meso-tetrasulfonatophenyl porphyrin: Effects of pH and micelles

Cited by 11 publications

References 46 publications

Influence of halogen atoms and protonation on the photophysical properties of sulfonated porphyrins

Influence of halogen atoms and protonation on the photophysical properties of sulfonated porphyrins

Use of Spectroscopic Techniques for Evaluating the Coupling of Porphyrins on Biocompatible Nanoparticles. A Potential System for Photodynamics, Theranostics, and Nanodrug Delivery Applications

Density Functional Theory Study of the Solvent Effects on Electronic Transition Energies of Porphyrins

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