In this study we evaluate the cytotoxic activity of two phthalocyanines (metallo-complexes) with absorption bands in the red part of the spectrum: zinc-tri-sulphonated phthalocyanine (ZnS3Pc) and zinc-tetrasulphonated phthalocyanine (ZnS4Pc) on human (8 MG BA and MCF-7) and animal (LSCC-SF-Mc29 and LSR-SF-SR) tumor cell lines using a neutral red uptake cytotoxicity test. The light source is a laser diode emitting at 672 nm. The experiments are made

The interaction of an anionic porphyrin meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) with a polymeric sorbant resin called Macronet in aqueous solution, is investigated in this paper by spectral techniques: UV-Vis, IR. The polymric resins used in this paper MN150, MN250, have a porosity formed by micropors (14 Å) and mesopors (300-400 Å) which yield to a high specific surface: 900-1200 m2/g and a small pors volume: 0,6-0,8 ml/g. Due to the big

A study of the effect of light on photodegradation reactions of riboflavin (RF) solutions in the presence of phosphate buffer has been made in this paper. Photodegradation is facilitated by UV radiation and yields to lumichrome (LC) and lumiflavin (LF). Some aspects concerning the RB dimerization and photoproducts identification (by chromatography coupled with mass spectrometry) are treated.

Pyrroles represent a unique set of supramolecular "building blocks" that, depending on the nature and number of substituents, are capable of stabilizing a range of self-assembled entities in the solid state. In this paper, it has been prepared new molecular aggregates composed of a iron oxide and a functional polymer (polypyrrole) with oxo dimers of porphyrin spacers. The new system is characterized by FTIR, UV-Vis and SEM techniques. The particles

The purpose of this paper is to follow the influence of chlorine or fluorine substituents of phthalocyanine dyes on their spectroscopic, photothermal and photoelectric properties. Such influence is discussed in term of the resonance effects occurring in organic macrocycles. The domination of mesomeric effect was indicated due to the large enhancement of photocurrent created by the studied systems and other changes in spectroscopic and photothermal

Polymerization reactions of cyclopentene, cyclooctene and cyclododecene have been carried out in presence of catalytic systems based on tungsten tetraphenylporphyrinate, under inert atmosphere at room temperature, in aromatic solvents. The catalyst precursor was prepared by interaction of WCl6 with free tetraphenylporphyrin in CCl4 and characterized by spectroscopic methods (e.g. UV-Vis etc.). Spectroscopic studies on the interaction between the

In this paper the UV-Vis spectra of methylene blue incorporated into a polypyrrole polymer matrix is discussed. The changes of the absorption maxima of methylene blue in the presence of polypyrrole have been fitted with Gauss type functions using a PC computer programme. In addition, the aggregation equilibrium for methylene blue alone and in the presence of polypyrrole is evaluated.

Spectroscopical properties and photocurrent (or photovoltage) of tetraphenyloporphyrins and metallotetraphenyloporphyrins in nematic liquid crystal have been studied. Photoelectric response has been measured in an electrochemical cell made of the semitransparent semiconducting and golden electrodes with porphyrin dyes embedded in liquid crystal. Fluorescence, time-resolved luminescence in microsecond time scale and photoacoustic spectra have also

Porphyrin dyes fulfill an essential function in photosynthesis and are important in photodynamic therapy and in a range of electronic devices. Their spectroscopic characteristics may play a crucial role in these processes. The spectral properties of two porphyrin dyes: tetraphenylporphyrin and tetraphenysulfporphyrin in organic solvents (acetone, chloroform, methyl alcohol, and dimethylsulfoxide) and in polyvinyl alcohol and poly(methylmethacrylate)

The incorporation of the five following porphyrins: meso-tetra(4-phenyl)porphyrin (TPP); meso-tetra(4-sulfonato-phenyl)porphyrin (TPPS4); meso-tetra(4-naphthyl)porphyrin (TNP); tri-sulfo-tetra-phenyl porphyrin (TPPS3) and tetra-sulfonato-naphthyl porphyrin (TNPS4) into human blood cells was investigated using flow cytometry, and absorption and emission spectroscopy. The percentage of stained cells, measured in a fluorescence cytometer, provided information