2022
DOI: 10.3390/photonics9090668
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Fluorescence Quenching of Carboxy-Substituted Phthalocyanines Conjugated with Nanoparticles under High Stoichiometric Ratios

Abstract: Background: The search of the approaches towards a photosensitizer’s conjugation with multifunctional nanoparticles is an important step in the development of photodynamic therapy techniques. Association of photosensitizer molecules with nanoparticles that perform the delivery function can lead to a change in the functional state of the photosensitizer. Methods: We studied the effects observed upon incorporation of octa- and hexadeca-carboxyphthalocyanines of zinc(II) and aluminum(III) (Pcs) into the polymer s… Show more

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Cited by 2 publications
(2 citation statements)
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“…In order to demonstrate the ability to image structural features by time-resolved multiphoton micro(spectro)scopy, we employed Zn-NMe2Nc to stain 1 µm sized aminated polystyrene microparticles (PSMPs) by a swelling-diffusion processes [75], as these are well-established models for microstructured samples (Figure 14b). As depicted in Figure 14, the photoluminescence emission spectra of Zn-NMe2Nc-loaded PSMPs (Zn-NMe2Nc@PSMP) in water show a broad emission band in the green (λmax ≈ 470 nm), but no emission was observed in the near-infrared region (Figure 14a); this points towards aggregation-caused quenching of the fluorescence from the macrocycle, as it was previously reported for other (na)phthalocyanines [76]. However, the distinct emission in the visible region, originating from the push-pull character of the excited side groups, can be utilized as an additional optical readout, despite the lack of intrinsic luminescence from the macrocycle.…”
Section: Time-resolved Multiphoton Micro(spectro)scopysupporting
confidence: 68%
“…In order to demonstrate the ability to image structural features by time-resolved multiphoton micro(spectro)scopy, we employed Zn-NMe2Nc to stain 1 µm sized aminated polystyrene microparticles (PSMPs) by a swelling-diffusion processes [75], as these are well-established models for microstructured samples (Figure 14b). As depicted in Figure 14, the photoluminescence emission spectra of Zn-NMe2Nc-loaded PSMPs (Zn-NMe2Nc@PSMP) in water show a broad emission band in the green (λmax ≈ 470 nm), but no emission was observed in the near-infrared region (Figure 14a); this points towards aggregation-caused quenching of the fluorescence from the macrocycle, as it was previously reported for other (na)phthalocyanines [76]. However, the distinct emission in the visible region, originating from the push-pull character of the excited side groups, can be utilized as an additional optical readout, despite the lack of intrinsic luminescence from the macrocycle.…”
Section: Time-resolved Multiphoton Micro(spectro)scopysupporting
confidence: 68%
“…Similar features of the spectral and fluorescent properties of multi-charged phthalocyanine molecules were observed in area of their high local concentration caused by the electrostatic binding of these molecules to the polymer shell of chalcogenide nanocarriers (quantum dots) [21].…”
Section: Discussionsupporting
confidence: 56%