Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

Olejarz, B.; Bursa, Bartosz; Szyperska, I.; Ion, Rodica‐Mariana; Dudkowiak, Alina

doi:10.1007/s10765-009-0606-2

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…By means of the LIOAS method, time-resolved photothermal signals were recorded. Technical specifications and more details of LIOAS apparatus were described elsewhere [12]. For LIOAS experiments, HP was dissolved in acetone, ethanol, and methanol (purchased from POCH, Poland).…”

Section: Measurementsmentioning

confidence: 99%

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Photophysical and Thermodynamic Parameters of Hematoporphyrin in Solutions and Monolayers

2012

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To achieve better understanding of anticancer photosensitizing efficiency and cellular membrane location ability, a study of hematoporphyrin and phospholipids in a dye and in a mixture of a dye and lipids in volumetric and 2D systems was performed. By means of steady-state absorption, fluorescence, and time-resolved optoacoustic spectroscopy, the fluorescence quantum yield, the fraction of absorbed energy converted into heat on a subnanosecond timescale, the efficiency of the dye's triplet-state population, and singlet oxygen generation characteristics of the dye were determined in chosen organic solvents. On the basis of the isotherms of hematoporphyrin and its mixture with phospholipid in Langmuir monolayers, the excess area, excess Gibbs energy, and compression modulus were estimated and the molecular interactions in the model systems investigated were discussed.

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Section: Measurementsmentioning

confidence: 99%

“…Analysis of the LIOAS signal gives information on the non-radiative fast deactivation of the excited singlet states, on population of the dye long-lived states, and on the dye ability to generate the reactive oxygen species [12]. The photophysical parameters obtained are given in Table 1.…”

Section: Measurementsmentioning

confidence: 99%

Photophysical and Thermodynamic Parameters of Hematoporphyrin in Solutions and Monolayers

2012

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“…The heat generated as a result of conversion of light energy absorbed by the pigments of cyanobacteria was measured by the photothermal technique. To record the photothermal signals, the laser-induced optoacoustic spectroscopic (LIOAS) method [24][25][26][27] was applied. The LIOAS setup (described in details in [28]) used the nitrogen-dye laser (GL-3300/GL301, Photon Technology Int., Birmingham, NJ, USA) as the excitation source.…”

Section: Measurementsmentioning

confidence: 99%

Heavy Metals Effect on Cyanobacteria Synechocystis aquatilis Study Using Absorption, Fluorescence, Flow Cytometry, and Photothermal Measurements

et al. 2010

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The toxic effect of six heavy metals on cyanobacteria Synechocystis aquatilis was studied by absorption, fluorescence, flow cytometry, and photothermal measurements. This study indicates that at the concentration used, the cyanobacteria are more sensitive to silver, copper, and mercury than to cadmium, lead, and zinc metals. Disregarding the decrease in the yields of the related radiative processes caused by photochemical processes and/or damage to phycobilisomes, no changes were detected in the efficiency of thermal deactivation processes within a few microseconds, which can indicate the lack of disturbances in the photosynthetic light reaction and the lack of damage to the photosystem caused by the heavy metal ions in the concentrations used. The results demonstrate that the relative values of fluorescence yield as well as promptly generated heat calculated for the metal-affected and unaffected (reference) bacteria are sensitive indicators of environmental pollution with heavy metal ions, whereas the complementary methods proposed could be used as a noninvasive and fast procedure for in vivo assessment of their toxicity.

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“…In conclusion, for a more stable porphyrin, the necessary criteria are porphyrins with mesosubstituent having positive Hammett constant, metallo-porphyrins d0 or d10, regardless of the valence central, most unstable being the porphyrin with Mg, Zn, Cd, Pb, Al, aromatic solvents, and with OH groups or NO 2 [73,74].…”

Section: Phthalocyanines and Some Current Applicationsmentioning

confidence: 97%

Porphyrins and Phthalocyanines: Photosensitizers and Photocatalysts

Ion¹

2017

Phthalocyanines and Some Current Applications

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The porphyrins and phthalocyanines are among the most representative macrocycles in synthetic chemistry, characterized by specific molecular structures, responsible and associated with their particular properties. They have high versatility and an adequate variability introduced either by macrocycle metallation or by different substituents at its periphery called meso-substituents. The porphyrins could find, together with the synthetic phthalocyanines, various scientific and technological applications in chemical and photochemical areas. They can serve as catalysts and photocatalysts in different reactions, or as photosensitizers in photodynamic therapy of cancer, due to their high efficiency to generate free radicals and excited state species. The aim of this chapter is to achieve a better understanding of the complex and various properties of the porphyrins and phthalocyanines in different solvents or in heterogeneous media, trying to draw the relationships between these topics with their possible applications in catalytic, photocatalytic area (photodegradation of Kraft-lignin, photooxidation of different unsaturated hydrocarbons, photodegradation of different organic aquatic pollutants, oxirans polymerization) and some preliminary results about the heterogeneous porphyrin sensitizers in the photodynamic therapy area. Their photobleaching mechanisms in different conditions are also discussed.

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Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

Cited by 8 publications

References 20 publications

Photophysical and Thermodynamic Parameters of Hematoporphyrin in Solutions and Monolayers

Photophysical and Thermodynamic Parameters of Hematoporphyrin in Solutions and Monolayers

Heavy Metals Effect on Cyanobacteria Synechocystis aquatilis Study Using Absorption, Fluorescence, Flow Cytometry, and Photothermal Measurements

Porphyrins and Phthalocyanines: Photosensitizers and Photocatalysts

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