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

Vanadium Doped Sol-Gel TiO2 Coatings

A study of the experimental conditions required to obtain vanadium doped sol-gel TiO2 coatings is presented. Tetraethyl orthotitanate was employed as the TiO2 source and VCl3, VOSO4·H2O and VOSO4 dissolved in H2SO4 were employed as vanadium sources. Dip coating has been used to produce coatings on silicon wafers, spectral carbon electrodes and titanium electrodes. Both supported and unsupported films have been studied by UV-Vis spectra, IR spectroscopy

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Supramolecular assemblies of pyridyl porphyrin and diazadithia phthalocyanine

In this paper we report for the first time on a mixed complex between the cationic porphyrin 5, 10, 15, 20-tetra-N-methyl-pyrydinium-p-il porphyrin (TMPyP) and a new metal phthalocyanine with four 16-membered diazadithia macrocycles (denoted here as Pc16), in order to obtain an active complex with an intense absorption on the lower energy side of the visible spectrum and with a higher sensitivity in photodynamic therapy of cancer. The dimerization

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Light, electron and photon irradiation of 5,10,15,20-tetra (4-sulfophenyl) porphyrin used in cancer therapy

Purpose: This paper deals with the experimental results of the modifying effects of ionizing radiation (electron beam and photons) and/or light on 5,10,15,20-tetra (4-sulfophenyl) porphyrin (TS4PP) in water, dimethylsulfoxide (DMSO) and their binary mixture, as solvents. Also, the incorporation of this porphyrin into human lymphocytes and granulocytes as one of the most important aspects of the photodynamic therapy of cancer, is presented. Materials

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Photocurrent generation in an electrochemical cell with substituted metalloporphyrins

Photocurrent generation in a semiconducting-metallic electrochemical cell filled with metallotetraphenyloporphyrins dissolved in polyvinylalcohol and metallotetranaphthyloporphyrins in nematic liquid crystal was investigated. The photopotential action spectra showed that the dye molecules are responsible for photoresponse. It has been shown that the intensity of photocurrent was dependent on the type of central metal complexed with the porphyrin

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A low temperature path to the preparation of CoFc2O4 ferrite

Ultrafine cobalt ferrite has been prepared by the decomposition of cobalt oxalate-hydrazinate complex, which is used as precursor. The preparation and thermal decomposition of the precursor have been studied using chemical, thermal, and infrared techniques. The precursor decomposes at low temperatures with the effusion of large amounts of gases. The coordination compounds used as chemical precursors have to include, ligands, which generate, by decomposition,

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Mixtures of synthetic organic dyes in a photoelectrochemical cell

Spectroscopic and photoelectric properties of phthalocyanine (Pc), tetranaphtyloporphyrin (TNP) and merocyanine (Me) and their mixtures have been studied. Dyes dissolved in polyvinyl alcohol in dimethylsulfoxide were immersed in a semiconducting/metallic photoelectrochemical cell. Absorption, fluorescence and photoacoustic spectroscopies have been used as methods to follow deactivation pathways of radiative and non-radiative processes of excited

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1,5-dihydroxyanthraquinones and an anthrone from roots of Rumex crispus

From the roots of Rumex crispus, two known anthraquinones and a new one together with a new anthrone were isolated and the structures of compounds 1-4 were elucidated by spectroscopic means. The singlet oxygen generation capacity was tested with 1,3-diphenylisobenzofuran (DPBF) for compounds 1-4.

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Methylene – Blue modified polypyrrole film electrode for optoelectronic applications

Organic semiconductors have been the objects of considerable attention in recent years, both as electrodes and photoelectrods in different applications. Radiation-induced and electrochemical modification of polypyrrole film by incorporating of large electro-active organic molecules is investigated in this paper. Introduction in the polypyrrole (PPy) of methylene blue as counterion has a strong effect on the electrochemical performance of PPy films.

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Clinical aspects of photodynamic therapy–Romanian experience

Photodynamic therapy is an emerging method for local destruction of tissue by generating toxic oxygen species using light absorbed by an administered or an endogenously generated photosensitiser. It is a promising treatment for patients with cancer. More recently it has found increasing use as a method of therapy for non-cancerous illnesses. Following administration of a photosensitiser occurs an accumulation or retention in areas of cancer and disease

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Study of the fluorescence-quenching of Mg-TNP by anionic anthraquinones

The fluorescence quenching of magnesium 5,10,15,20-tetra-p-naphtyl- porphyrin (Mg-TNP) has been studied in benzene using 9,10-anthraquinone-2- sulfonic acid sodium salt (An 1), 9,10 -anthraquinone-2,6-disulfonic acid sodium salt monohydrate (An 2), 9,10-anthraquinone-1,5-disulfonic disodium salt monohydrate (An 3) as quenchers. The fluorescence quenching rate constants are deduced from the Stern-Volmer curves and it is postulated that the quenching

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