Photoactive dyes

In should be noted that the same problem exists for both other photosensitizers and other methods for decontamination of the blood and its components (e.g. absorption) (Mohr, 2000). The use of fullerenes is to be preferred to the use of photoactive dyes because the former are water-soluble components. Due to its insolubility in water, fullerene may be easily removed from the liquid phase after the procedure of decontamination. 

B. Modes of light delivery V. Examples of Photoactive Dyes used for 133... 

V. EXAMPLES OF PHOTOACTIVE DYES USED FOR PHOTODYNAMIC KILLING OF MICROORGANISMS... 

TABLE 3.3 Physicochemical and photochemical properties of the photoactive dyes (adapted from Brovko et at, 2009)... 

Perylenediimides represent another class of photoactive dyes which are characterized by their strong fluorescence emission and facile electrochemical reduction. Recently, a supramolecular bis(phthalocyanine)-perylenediimide hetero-triad (compound 42) has been assembled through axial coordination [47]. Treatment of perylenediimide 43, which has two 4-pyridyl substituents at the imido positions, with 2.5 equiv. of ruthenium(II) phthalocyanine 44 in chloroform affords 42 in 68% yield (Scheme 3). This array shows remarkable stability in solution due to the robustness of the ruthenium-pyridyl bond. Its electronic absorption spectrum is essentially the sum of the spectra of its molecular components 43 and 44 in... 

Langmuir-BIodgett-Kuhn (LBK) films are prepared by a dipping process in which monolayers floating at the air/water interface are deposited on a solid substrate. LBK films are highly ordered supramolecular assemblies. By selection of the amphiphilic molecules and adjustment of the transfer conditions, the LBK technique offers extensive structural control and opens a wav to optimize matrices for photoactive dyes. 

Several photoactive dyes have been incorporated into LBK films. Among these, the class of photoisomerizing dyes, namely azobenzene derivatives, are particularly versatile and have been investigated in great detail. 

Photoactive dyes Coffee and beans 50 mM Boric acid/10 mM sodium borate, pH 8.5 0.08 pg L ... 

Lithographic printing plate coatings Photoactive dye coatings Photoactive resins, photoresists Polyolefin bonded coating Liquid tonor modifier Antifriction coating lacquers... 

The second mechanism, which has already been briefly mentioned above, was proposed in 1949 by Bamford and Dewar " "" and postulates an initial interaction between the photoactive dye and the substrate by a process of hydrogen atom abstraction. This creates a free radical centre in the polymer, which is then attacked by oxygen in the usual way. The presence of alkali was found to accelerate the process and under these conditions the photoactive dye is believed to abstract an electron from the hydroxyl anion to give active hydroxyl radicals (Scheme 2). 

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