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Excited state intramolecular charge transfer (ICT) process in a donor–chromophore–acceptor system 5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid ethyl ester (DMAPPDE) has been investigated spectroscopically in combination with quantum chemical calculations. The molecule DMAPPDE shows dual fluorescence corresponding to emission from the locally excited as well as charge transfer states in polar...
Aerogels are highly porous materials whose interesting chemico-physical properties can be exploited in several advanced applications. Ceramic aerogels based on titanium oxides, allow coupling the physical properties with the photocatalytic role of TiO 2 in promoting pollutant photodegradation, selective organic photosynthesis, and antibacterial activity. Here, we prepared hybrid organic-ceramic...
We report detailed behavior of the spirobenzopyran covalently attached to poly(N,N-dimethylacrylamide), which exhibits reversible and drastic proton dissociation in response to blue light in aqueous system. The molar absorption coefficient spectra of the chromophores in open-/closed-ring forms and their protonated forms were isolated respectively from the data obtained in the various conditions of...
Indocyanine green (ICG) is a chemically labile compound which needs to be stabilized in aqueous media to be used in biomedical applications. In the present study, poly(ε-caprolactone) (PCL), a semi-crystalline polyester, was used to encapsulate and stabilize ICG in a hydrophobic environment. A hydrophobic and biocompatible nanocomposite was obtained by the process of encapsulating inorganic silica...
Since the introduction of 2-aminopurine (2AP) in 1969 as a fluorescent analogue of adenine, its intense fluorescence in aqueous solution and the subsequent reduction of this intensity in DNA has been a powerful tool for studies of structural changes in DNA. Herein, we show that the unusual intense fluorescence of 2AP in water is attributed to the formation of a closed complex between one water molecule...
The fluorescence technique for estimation of OH radicals formation on the surface of TiO 2 photocatalyst has been reported. However in this method the linear dependence between formation of 2-hydroxyterephthalic acid (2-HTA) and irradiation time not always is obtained. In this paper the influence of TA concentration on the formation of 2-HTA at the presence of TiO 2 /N photocatalyst...
The cyclodextrins effects on the serotonin (5HT) and 5-hydroxy-3-indolyl acetic acid (5HIA) fluorescence emission in acid and alkaline quenching conditions were analyzed. From Stern–Volmer plots, the quenching constants (K Q ) were determined in the presence and absence of β-cyclodextrin (βCD) and hydroxypropyl-β-cyclodextrin (HPβCD). In both media a decrease in the values of K Q was...
Different methods have been employed in order to increase the value of the photoinduced anisotropy in azopolymers and to ensure more effective polarization recording. As recently established, doping photopolymers with nanoparticles allows to achieve near 100% net diffraction efficiency in case of conventional holographic recording. For this reason, we have synthesized novel organic/inorganic composite...
Effect of π-spacer on the optical properties of two novel D-π-A-π-D type fluorenone-based linear conjugated oligomers 2,7-di((E)-2-(10-octyl-10H- phenothiazin-3-yl)vinyl)-9-fluorenone (P-FO-P) and 2,7-di((E)-2-(9,9-dioctyl-7-((E)-2-(10-octyl-10H-phenothiazin-3-yl)vinyl)-9H-fluoren-2-yl)vinyl)-9-fluorenone (P-F-FO-F-P) is investigated, where fluorenone and phenothiazine units act as the electron acceptor...
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