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The photophysical properties of the widely used plant growth regulator 2-(1-naphthyl) acetamide (NAD) were studied in water and representative organic solvents (ethanol, ethylene glycol, acetonitrile, chloroform, 1,4-dioxane) employing steady-state and time-resolved spectroscopy. Quantum yields and lifetimes of fluorescence, phosphorescence and triplet formation and triplet–triplet absorption spectra...
Two non zwitterionic analogues of fluoroquinolone drugs, viz. 1-ethyl-7-piperidino-8-fluoroquinol-4-one-3-carboxylic acid and 1-ethyl-7-piperidino-6,8-difluoroquinol-4-one-3-carboxylic acids have been synthesized and their photochemistry has been investigated. Both compound undergo photoheterolysis of the C 8 F bond generating a triplet cation that either inserts into the 1-alkyl chain or...
In this paper, three differently sized glutathione (GSH)-capped CdTe@ZnS quantum dots (QDs) have been successfully conjugated to nickel tetraamino-phthalocyanine (NiTAPc) to form different QDs-NiTAPc nanocomplexes. Several techniques such as TEM, FT-IR, time-resolved fluorescence measurement and electronic spectroscopy were employed to characterize the nanocomplex. Bromide ion was chosen as a model...
A new spironaphthopyran-based photochromic chelator was synthesised, and its photochromic, thermochromic and metallochromic properties were investigated. In the presence of Cd 2+ , Mn 2+ , Ni 2+ , Co 2+ , Zn 2+ and Cu 2+ ions in acetone solutions 1:1 and 1:2 metal:merocyanine complexes were formed simultaneously. Electron absorption spectroscopy (isomolar...
Fluorescence emission properties of 2,6-diamino-8-azapurine (2-amino-8-azaadenine) in aqueous medium were examined. The title compound exhibits strong fluorescence centered at 365nm, with quantum yield 0.40 and bi-exponential decay with lifetimes of ∼7.5 and ca. 0.2ns. The spectral properties of 2,6-diamino-8-azaapurine are very similar to those of its 9-alkoxyphosphonate, suggesting that the protomer...
The photo-degradation of metal complexes of caffeic acid was compared to the photo-degradation of free caffeic acid by using UV–vis spectroscopy and HPLC–ESI-mass spectrometry. This article reports first the determination of the products that are formed from the photo-degradation of trans-caffeic acid in aqueous solution and the investigation of the mechanism by a kinetic approach. The good fit between...
The influence of lattice distortions on TiO 2 photocatalysis produced by subjecting commercially available P25 titania samples to a heat treatment in the temperature range 645–800°C was examined; it caused the initial anatase-to-rutile ratio of 81/19 to decrease to 1/99 at the highest temperature. The photoactivities of these heat-treated samples were established through the photodegradation...
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