Aggregation state of amphiphilic cationic tetraphenylporphyrin derivatives in aqueous microheterogeneous systems

Gradova, Margaret A.; Zhdanova, Kseniya A.; Брагина, Н. А.; Лобанов, А. В.; ́nikov, M. Ya. Mel

doi:10.1007/s11172-015-0937-z

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…Along with the bactericide activity, due to the specific geometry and electronic structure, the complexes of metals with porphyrins have a significant effect on the crystallization and segmental orientation of macromolecules [ 22 ]. The pristine porphyrin molecules as well as their metal complexes are amphiphilic [ 23 ] or even hydrophobic [ 24 ] that promote their aggregation in the form of nanoparticles [ 23 , 25 , 26 , 27 ]. Depending on the nature of the metal included in metalloporphyrins, they exhibit a variable tendency to aggregation [ 28 ] that determines their ability to act as nucleating agents during polymer crystallization.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Characterization of Ultrathin Poly(3-hydroxybutyrate) Fibers Loaded with Tetraphenylporphyrin and Its Complexes with Fe(III) and Sn(IV)

et al. 2022

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The effect of small additions (1–5 wt.%) of tetraphenylporphyrin (TPP) and its complexes with Fe (III) and Sn (IV) on the structure and properties of ultrathin fibers based on poly (3-hydroxybutyrate) (PHB) has been studied. A comprehensive study of biopolymer compositions included X-ray diffraction (XRD), differential scanning calorimetry (DSC), spin probe electron paramagnetic resonance method (EPR), and scanning electron microscopy (SEM). It was demonstrated that the addition of these dopants to the PHB fibers modifies their morphology, crystallinity and segmental dynamics in the amorphous regions. The annealing at 140 °C affects crystallinity and molecular mobility in the amorphous regions of the fibers, however the observed changes exhibit multidirectional behavior, depending on the type of porphyrin and its concentration in the fiber. Fibers exposure to an aqueous medium at 70 °C causes a nonlinear change in the enthalpy of melting and challenging nature of a change of the molecular dynamics.

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Section: Introductionmentioning

confidence: 99%

Evaluation and Characterization of Ultrathin Poly(3-hydroxybutyrate) Fibers Loaded with Tetraphenylporphyrin and Its Complexes with Fe(III) and Sn(IV)

et al. 2022

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“…Porphyrin and metalloporphyrin have strong UV−vis absorption peaks due to their π-electron conjugated structures, exhibiting two characteristic absorption bands (B-band and Qband) on their UV−vis spectra. 40 As seen from Figure 1c, there are a sharp B-band absorption peak at 419 nm and four weaker Q-band absorption peaks at 516, 550, 592, and 650 nm in the UV−vis spectrum of TPP, indicating that TPP with πconjugate structures was synthesized successfully. Meanwhile, Figure 1c shows that NiTPP and VOTPP both have a B-band absorption peak (at 416 and 425 nm, respectively) and a Qband absorption peak (at 529 and 547 nm, respectively).…”

Section: Resultsmentioning

confidence: 81%

“…The UV–vis spectral analysis was performed on TPP, NiTPP, and VOTPP to study their conjugate structures. Porphyrin and metalloporphyrin have strong UV–vis absorption peaks due to their π-electron conjugated structures, exhibiting two characteristic absorption bands (B-band and Q-band) on their UV–vis spectra . As seen from Figure c, there are a sharp B-band absorption peak at 419 nm and four weaker Q-band absorption peaks at 516, 550, 592, and 650 nm in the UV–vis spectrum of TPP, indicating that TPP with π-conjugate structures was synthesized successfully.…”

Section: Resultsmentioning

confidence: 84%

Insights into the Self-Aggregation of Porphyrins and Their Influence on Asphaltene Aggregation

et al. 2021

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Despite the studies on asphaltene aggregation throughout few decades, the formation of asphaltene aggregates and subsequent deposition are still the biggest challenges in the oil industry. Especially, the role of porphyrins existing in oil naturally on asphaltene aggregation is not completely understood due to asphaltene’s and porphyrin’s special structures. Herein, we investigated the influence of tetraphenylporphyrin (TPP), nickel tetraphenylporphyrin (NiTPP), and vanadium tetraphenylporphyrin (VOTPP) on asphaltene aggregation by a multiscale approach, which provides an in-depth understanding of the role of porphyrins on asphaltene aggregation. UV–vis spectroscopy and fluorescence spectroscopy were performed to examine the self-aggregation of TPP, NiTPP, and VOTPP and the influence of porphyrins on the aggregation of asphaltene. The changes of stacking structures, microscopic structures, and particle size distributions of co-aggregates of asphaltenes with porphyrins were analyzed in detail via X-ray diffraction, inverted fluorescence microscopy, and granulometric distribution, respectively. The characterization results indicated that the aggregation ability of the porphyrins (TPP, NiTPP, and VOTPP) was stronger than that of asphaltene and porphyrins can promote the aggregation of asphaltene, which leads to the increase of the average aromatic sheet number, aggregation morphology, and particle size of asphaltene aggregates. Based on experimental analysis, the possible mechanism by which porphyrins promoted asphaltene aggregation was elucidated. This research provided new insights into the aggregation and disaggregation of asphaltenes.

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“…Depending on the nature of the metal, metalloporphyrins show a different tendency to aggregation, and this determines their ability to act as nucleating agents during polymer crystallization. In addition, porphyrins and their metal complexes have several binding centers in their structure, which contribute to the emergence of coordination interactions with the molecular environment [ 16 , 17 ]. First of all, the coordinating activity of the central-complexing metal ion should be singled out.…”

Section: Introductionmentioning

confidence: 99%

A Feature of the Crystalline and Amorphous Structure of Ultra Thin Fibers Based on Poly(3-hydroxybutyrate) (PHB) Containing Minor Concentrations of Hemin and a Complex of Tetraphenylporphyrin with Iron

et al. 2022

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Comprehensive studies combining X-ray diffraction analysis, thermophysical, dynamic measurements by probe method and scanning electron microscopy have been carried out. The peculiarity of the crystalline and amorphous structure of ultra-thin fibers based on poly(3-hydroxybutyrate) (PHB) containing minor concentrations (0–5%) of a gene and a tetraphenylporphyrin (TFP) complex with iron (in the form of FeCl) are considered. When these complexes are added to the PHB fibers, the morphology of the fibers change: a sharp change in the crystallinity and molecular mobility in the amorphous regions of PHB is observed. When adding a gel to the fibers of PHB, a significant decrease in the degree of crystallinity, melting enthalpy, and correlation time can be observed. The reverse pattern is observed in a system with the addition of FeCl-TFP—there is a significant increase in the degree of crystallinity, melting enthalpy and correlation time. Exposure of PHB fibers with gemin in an aqueous medium at 70 °C leads to a decrease in the enthalpy of melting in modified fibers—to an increase in this parameter. The molecular mobility of chains in amorphous regions of PHB/gemin fibers increases at the same time, a nonlinear dependence of changes in molecular dynamics is observed in PHB/FeCl-TFP fibers. Ozonolysis has a complex effect on the amorphous structure of the studied systems. The obtained fibrous materials have bactericidal properties and should be used in the creation of new therapeutic systems of antibacterial and antitumor action.

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Aggregation state of amphiphilic cationic tetraphenylporphyrin derivatives in aqueous microheterogeneous systems

Cited by 10 publications

References 25 publications

Evaluation and Characterization of Ultrathin Poly(3-hydroxybutyrate) Fibers Loaded with Tetraphenylporphyrin and Its Complexes with Fe(III) and Sn(IV)

Evaluation and Characterization of Ultrathin Poly(3-hydroxybutyrate) Fibers Loaded with Tetraphenylporphyrin and Its Complexes with Fe(III) and Sn(IV)

Insights into the Self-Aggregation of Porphyrins and Their Influence on Asphaltene Aggregation

A Feature of the Crystalline and Amorphous Structure of Ultra Thin Fibers Based on Poly(3-hydroxybutyrate) (PHB) Containing Minor Concentrations of Hemin and a Complex of Tetraphenylporphyrin with Iron

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