Articolele autorului Rodica-Mariana ION
Link la profilul stiintific al lui Rodica-Mariana ION


Porphyrins can form a variety of structures from linear head-to-tail or J-aggregates to fractal aggregates with different and specific photophysical properties. In this paper, the controlled aggregation of meso-5 ,10, 15, 20-sulfonato-phenyl porphyrin (H2TPPS44-) was studied at room temperature. Structure of the aggregates was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-visible spectroscopy.

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Spectral characterisation of selected stilbentriazine dyes – Structural trans-cis isomerisation

The paper deals with the spectral investigations of new stilbentriazine dyes containing amino groups or alkoxy group attached to the main molecular triazine ring. Absorption and fluorescence spectra of the dyes in aqueous solutions were recorded. The existence of two spectral structures absorbing at 275 and 350 nm was shown and they are assigned to cis- and trans - structures of dyes, respectively. It was indicated that absorption and fluorescence

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Combined spectral analysis (EDXRF, ICP-AES, XRD, FTIR) for characterization of bronze Roman Mirror

Archaeometallurgy is, to some extent, applied engineering in a discipline of anthropology. It describes the properties and production of metal objects from archaeological or at least historical contexts. The chemical and structural examination of the surface corrosion products grown on archaeological bronzes has been the subject of study for at least 170 years. During the last decades, scientists have made extensive use of different analytical methods

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Extended Networks Generated from the Interaction of Rare-Earth(III) Ions and Pyridine-2-carboxamide-Based Ligands
Spectral Investigations of Fullerene{Porphyrin Complexes

Spectral investigations of some m-oxo-dimer complexes of trivalent metals (Mn, Fe) with two di®erent ligands: tetraphenylporphyrin and tetranaphthylporphyrin (TNP), and fullerene (C60 and C70) complexes with m-oxobis[5,10,15,20-tetraarylporphyrinatometal (III)] (TXP-M)2O dimer, where M = Fe, Mn and X = phenyl or naphthyl, are presented. Discus- sion of the main electronic and vibrational bands observed in the UV-Vis-IR and Raman spectra of both

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Comparative study of some nano- and micro – sensitizers

The development of new virus inactivation procedures became an area of growing interest mainly due to increased demands concerning the safety of biological products. Photochemical processes represent the most promising methods for the future to inactivate viruses. In these methods, dyes are the most widely used photosensitising reagents. The current article covers a new interesting compound microsensitizer as 5,10,15,20-tetra-sulfonato-phenyl porphyrin

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Porphyrin encapsulation in nanostructured hydrogels

Nanoporous hydrogels have been prepared by freezing-thawing method. Three types of porphyrins have been encapsulated into PVA hydrogels. It was demonstrated that the PVA hydrogels represent an efficient encapsulation vehicle for porphyrins. Hydrogels prepared from high molecular mass PVA have a better sorption profile for porphyrins, and are better suited for the preparation of controlled release vehicles.

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Synthetic porphyrins in experimental photodynamic therapy induce a different anti tumoral effect

The aim of the study was to investigate the influence of discrete structural differences in synthetic porphyrins on the antineoplastic effect induced in myelocitic cell line K562 after experimental photodynamic therapy procedure. For this study, we used 5,10,15,20-tetra (1-na phthyl)- porphyrin, 5,10,15,20-tetra (4-sulfonatophenyl)porphyrin and their Zn complexes. For all these compounds, the following photodynamic therapy parameters were optimized:

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Laser effect in photodynamic therapy of tumors

Photodynamic therapy is a method that provides a reasonable alternative to other treatment modalities for patients with certain cancers, and in some cases may be the preferred treatment. The therapy implies the intravenous administration of a light-sensitive substance, the photosensitizer. The used sensitizer must absorb at long wavelength. For these purposes, the carbon dioxide laser, He-Ne and the argon laser are particularly suitable. In this

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A study on the photodynamic therapy of photosensitizer-coated magnetic nanoparticles

One of the important points in the use of magnetic nanoparticles for biomedical applications is the encapsulation of the magnetic material, in order to make it biocompatible, producing a bio-ferrofluid. In this paper, ferrimagnetic particles of Fe3O4 were nanometrically synthesized. In order to coat a photosensitizer on the magnetic particles, TSPP was choosed and introduced into the ferrofluid suspension containing magnetite and the adsorption reaction

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