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In the present study, the photocatalytic degradation of five s-triazine (simazine, prometryn, terbutryn, atrazine and terbuthylazine) and three chloroacetanilide (propachlor, s-metolachlor, alachlor) herbicides in leaching water has been investigated. Zinc oxide (ZnO) and titanium dioxide (TiO 2 ) were used as semiconductors at pilot plant scale under natural sunlight. The addition of an oxidant...
A molecule having ethylenediamine unit with symmetrically attached aromatic frames has been synthesized, characterized and reported as a highly selective and sensitive chemosensor for Zn 2+ and Cd 2+ ion. UV–vis absorption and fluorescence emission spectra, quantum yield calculation, fluorescence lifetime measurement and the observed stability constant of metal-sensor complex support...
The inclusion complex of Rhodamin B (Rh B) with (N-6-deoxy-β-cyclodextrin-6-yl-1-aminocarbonyl)-3-(4-fluorobenzoyl)-7-pyridin-4-yl indolizine [designated as compound (1)] is shown to be a potential pH sensor based on fluorescence resonance energy transfer (FRET). By steady state and time-resolved fluorimetry it has been established that (i) an excited state proton transfer (ESPT) occurs between the...
New fluorescent methoxylated di(hetero)arylethers in the thieno[3,2-b]pyridine series were prepared by a copper-catalyzed Ullmann-type CO coupling of the methyl 3-amino-6-bromothieno[3,2-b]pyridine-2-carboxylate with ortho, meta and para-methoxyphenols, using N,N-dimethylglycine as the ligand and Cs 2 CO 3 as the base. The compounds obtained were tested for their inhibitory growth...
The syntheses and photophysical properties of 1-(5-methylhexyl)-2,3,7,8-tetrahydro-1H-naphtho[2,1-e]indol-9(6H)-one (7a) and 1-(5-methylhexyl)-2,3,8,9-tetrahydro-1H-naphtho[2,1-e]indol-6(7H)-one (7b) are reported. They are prepared in eight steps from the corresponding bromonaphthylamines. These fluorescent compounds have PRODAN-like cores, and they are structurally similar to cholesterol. Compound...
A novel series of mesoporous NiO/TiO 2 nanoparticles was successfully synthesized by sol–gel method using cetyltrimethylammonium bromide as controlling template in attempts to study the photodegradation of methylene blue dye. Structural and textural features of the composite samples were investigated by X-ray diffraction (XRD), nitrogen adsorption–desorption isotherm, Fourier transformer infra-red...
The singlet oxygen generation of a photosensitizer compound (PS) is an important property for photodynamic treatments. The PS quantum yield of 1 O 2 (Φ Δ ) is usually obtained by the time-resolved measurement of 1 O 2 phosphorescence emission. However, the equipment employed is quite expensive. In the present study, the methodology previously proposed by us...
We propose a method for dynamically sensing oxygen concentration in a local nanoscale domain of a thin polymer film using histograms of photon interdetection times of single molecules. By temporally analyzing the histograms, a dynamical change in the triplet lifetime of single molecules in thin polymer films with different thicknesses can be measured with respect to the oxygen concentration in a gas...
Magnetic field effect (≤0.2T) on photosensitized oxidation of 1,3-diphenylisobenzofuran (DPBF) in aerated SDS micellar solution was studied using high-performance liquid chromatography. When anthraquinone and 4-methylbenzophenone were used as sensitizers, the formation yield of o-dibenzoylbenzene increased remarkably along with the oxidation yield of DPBF by application of a magnetic field. The results...
This paper summarizes recent research works dealing with the development of photoelectrocatalytic oxidation technologies combining both electrolytic and photocatalytic processes. Photoelectrocatalytic technologies have received particular attention due to their potential and effectiveness in the photodegradation of refractory organic and microbial pollutants present in water and wastewater. Here,...
A donor-π-acceptor-π-donor (D-π-A-π-D) type Bis-Chalcone, (1E,4E)-1,5-di-2-thienylpenta-1,4-dien-3-one (D2TDO) was synthesized by Claisen–Schmidt reaction. Structural characterization was done with the help of UV, FT-IR, 1 H NMR, 13 C NMR and Mass Spectroscopic techniques. Through gravity settling method, a homogenous film of D2TDO with 65μm thickness was made in poly(methylmethacrylate)...
A photochromic phenoxyquinone-based, sensor for aliphatic primary amine was developed. An efficient trans-to-ana photoisomerization was occurred when 6-(4′-methoxyphenoxy)-5,12-naphthacenequinone in acetonitrile was irradiated with 365nm UV light. The photochemically generated “ana” quinone intermediate was found to undergo nucleophilic substitution reactions by aliphatic primary amines to afford...
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