Journal ArticleDOI
Laser Flash Photolysis of Phthalocyanines in Solution and Microemulsion
Patrice Jacques,André M. Braun +1 more
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In this article, the authors investigated the variation of the transient optical density as a function of the intensity of the exciting laser in homogeneous solutions (1-chloronaphthalene, 1-propanol) and in microemulsion.Abstract:
Triplet state formation (Φisc) and properties (eT-T, τT) of phthalocyanine (HPC) and zinc phthalocyanine (ZnPC) have been characterized in homogeneous solutions (1-chloronaphthalene, 1-propanol) and in microemulsion by investigating the variation of the transient optical density as a function of the intensity of the exciting laser. Experimental results follow the theoretically predicted dependence only for very low intensities of the exciting pulse. At higher intensities, a more complicated scheme of primary reactions has to be taken into account, implicating qualitative restrictions in the application of saturation experiments. The observed transients at high-intensity excitation are interpreted as being perturbed by aggregational phenomena.read more
Citations
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Journal ArticleDOI
Synthetic pathways to water-soluble phthalocyanines and close analogs
TL;DR: The different types of water-soluble phthalocyanines are presented and their synthesis is reviewed in this article, where the synthesis process is described in detail and the synthesis is discussed.
Journal ArticleDOI
The microenvironment effect on the generation of reactive oxygen species by Pd-bacteriopheophorbide.
Yahel Vakrat-Haglili,Lev Weiner,Vlad Brumfeld,Alexander Brandis,Yoram Salomon,Brian Mcllroy,Brian C. Wilson,Anna Pawlak,Malgorzata Barbara Rozanowska,Tadeusz Sarna,Avigdor Scherz +10 more
TL;DR: It is shown that Pd-bacteriopheophorbide (Pd-Bpheid), a useful reagent for vascular targeted PDT (VTP) of solid tumors, which has recently entered into phase II clinical trials under the code name WST09, forms appreciable amounts of hydroxyl radicals, superoxide radicals, and probably hydrogen peroxide in aqueous medium but not in organic solvents where singlet oxygen almost exclusively forms.
Optical sensors
TL;DR: The field of nanosensing is relatively new and reports in the literature presenting any problems associated with such a scale of analysis are sparse as discussed by the authors, however, many papers have been published over the past decade, which can be either chemical or biological, depending on the type of probe used.
Journal ArticleDOI
Synthesis, photophysical and photochemical properties of substituted zinc phthalocyanines
TL;DR: These zinc(II) phthalocyanine complexes showed high triplet and singlet oxygen quantum yields, which are very important for Type II mechanism, and show potential as Type II photosensitizers.
Journal ArticleDOI
Effects of substituents and solvents on the photochemical properties of zinc phthalocyanine complexes and their protonated derivatives
TL;DR: In this paper, the effect of substituents on protonation of ZnPc derivatives with axial ligands was studied with respect to photobleaching, fluorescence and singlet oxygen quantum yields.
References
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Journal ArticleDOI
Photophysical and Photochemical Processes in Micellar Systems
TL;DR: In this paper, the authors present a Web of Science Record created on 2006-02-21, modified on 2017-05-12.Reference LPI-ARTICLE-1980-008
Journal ArticleDOI
Determination of triplet quantum yields by laser flash absorption spectroscopy
B. Amand,R. Bensasson +1 more
TL;DR: In this paper, a general method based on relative actinometry using the laser flash spectroscopy technique has been developed for the determination of the quantum yield of triplet state formation φ,T.
Journal ArticleDOI
Picosecond laser photophysics. Group 3A phthalocyanines
James Brannon,Douglas Magde +1 more
Journal ArticleDOI
Intensity dependence in laser flash photolysis experiments: Hydrated electron formation from ferrocyanide, tyrosine, and tryptophan
TL;DR: In this paper, the light intensity dependence in monophotonic and consecutive biphotonic processes under laser flash photolysis conditions is derived, and the results are applied for analyzing the process of hydrated electron formation from excited states of various substances.