Showing papers in "Journal of Photochemistry in 1987"

TL;DR: The synthesis of the di(glycyl)imide derivative of 3,4,9,10-perylenetetetracarboxylic dianhydride and its spectral properties in basic aqueous solutions are described in this article.

TL;DR: In this article, the formation of the absorption spectrum of a nitronic acid with τ = 5 ns was observed in each case, and the conversion into the end products (nitroso compound and carboxylic acid) occurred at a much faster rate from the Nitronic acid than from the nitronate anion: τ = 80μs (CH 2 Cl 2 ), τ = 360 μs (60vol.%EtOH-40.%H 2 O, 10 −4 M H 2 SO 4 ).

TL;DR: In this article, the quantum yields for the cis → trans photoisomerization of azobenzene have been determined in various solvents, and the discrepancy with previous reported values are briefly discussed.

TL;DR: In this article, the absorption cross-sections of the CF2 radical in the UV for the transition A 1B1← X 1A1 at 0.5 nm intervals were obtained.

TL;DR: In this article, the degradation of cyanate ion, OCN− was investigated employing two peroxides, H2O2 and S2O82−, in the presence and absence of light.

TL;DR: In this article, the authors measured the activation energies of polynucleotides and single-stranded (ss) DNA in deoxygenated aqueous solution at room temperature upon nanosecond laser excitation at 248 nm.

TL;DR: The photochemical cis-trans isomerization of 1-(9-anthryl)-2-phenylethylenes (9-styrylanthracenes) has been studied by performing steady state and time-resolved fluorescence measurements.

TL;DR: In this article, the Pschorr reaction by Ru(bpy) 3 2+ in the fluorenone, fluorene and dibenzofuran series occurs with a low yield and slow rate in contrast with the photocatalysis previously observed for the phenanthrene series.

TL;DR: In this article, the functional dependence of various spectroscopic and photophysical parameters on the polar co-solvent concentration in binary solvent mixtures was studied. But the results for aniline, N,N -dimethylaniline (DMA) and some further alkyl-substituted and rigid anilines derivatives in various solvents were not analyzed.

TL;DR: In this paper, the selectivities of photoreactions of arenes to olefins are discussed on the basis of the exciplex mechanism, which is also influenced by the photoinduced charge transfer.

TL;DR: In this article, the photophysical properties of 1,8-naphthalimide derivatives were studied and the absorption and fluorescence spectra were consistent with the assumption of exciplex formation.

TL;DR: In this paper, the quantum yield of bond cleavage in the photorearrangement of the o-nitrobenzyl esters does not depend on the chemical nature of the ester group but is significantly influenced by the substituent in the α position φ(PR) = 0.22 ± 0.03 (MoNBB, αPoNBB).

TL;DR: In this paper, water-soluble benzophenones were used to induce photopolymerization of acrylamide in homogeneous solution and the determination of the processes in the excited states (through laser spectroscopy) forms a basis for the discussion of the photoinitiation step of the reaction as well as the specific interactions of cationic and anionic derivatives with the monomer.

TL;DR: The following molar absorbancies and individual quantum yields (IQYs) of oxalate complexes were determined at 254 nm, taking into consideration the uncertainties of the stability constants as mentioned in this paper.

TL;DR: In this paper, a review of decarboxylation and oxidation reactions of carboxylic acids in the presence of various light receivers is presented from both experimental and mechanistic standpoints.

TL;DR: In this article, the absorption cross-sections of the monomer and dimer of formic acid vapor at 302 K were determined at 1 nm intervals from 195 to 250 nm by non-linear least-squares analysis of the per cent transmission of 29 pressures at each wavelength.

TL;DR: In this paper, the authors used microsecond flash spectroscopy over a wide range of temperatures between room temperature and −170 °C, in decalin and methyltetrahydrofuran as solvents.

TL;DR: Isatin does not show fluorescence or phosphorescence under any conditions as discussed by the authors and after excitation it undergoes rapid intersystem crossing to the triplet state (τ = 340 ns in deaerated benzene).

TL;DR: The spectral and kinetic behavior of nitrile imines photogenerated from sydnones and tetrazoles in fluid solutions has been studied by laser and lamp flash photolysis.

TL;DR: The photochemistry and photofading of the leuco and dye forms of the crystal violet lactone colour former system have been examined under various conditions using UV absorption, flash photolysis and high performance liquid chromatography techniques as well as hydroperoxide analysis.

TL;DR: In this paper, the triplet properties of juglone, a monohydroxyquinone, were thoroughly investigated in cyclohexane, acetonitrile, methanol and isopropanol, by the technique of nanosecond laser flash photolysis.

TL;DR: In this paper, the photoisomerization about the αβ and γδ double bonds and the electrocyclic ring closure reaction are competing processes within the excited singlet state of the phenylfulgides.

TL;DR: In this paper, the interaction of singlet molecular oxygen O2(1Δg) with 2,4-, 2,5-and 2,6-dinitrophenol was investigated.

TL;DR: In this article, the authors show that aminophenols and anisidines act as proton donors in ether and acetonitrile but as acceptors in methanol and water in the S 0 state.

TL;DR: In this paper, the fluorescence and phosphorescence spectra of 2-methylharmine and harmaline were investigated at 77 K and the pKa values for the first excited triplet state equilibria were calculated by applying the Forster-Weller relation.

TL;DR: In this article, the dechlorination of 4-chlorobiphenyl (ClBi) photosensitized by N,N -dimenthylaniline (DMA) was studied by means of continuous photolysis at 313 nm.

TL;DR: In the presence of a photosensitizer (anthraquinone), a surface film of pristane on synthetic sea water was photo-oxidized by sunlight as mentioned in this paper, which led on the one hand to the formation of tertiary alcohols and on the other hand, after α-cleavage reactions, to different fragmentations of the Pristane molecule into alkanes and ketones.

TL;DR: In this article, the triplet state of trans-mono-azastilbenes ( n -styrylpyridines) ( n is an integer) and trans-diazastil benes (n,n′ -dipyridylethylenes) has been obtained from a laser flash photolysis study.

TL;DR: In this paper, the authors investigated the gas phase reactions of F2 with a variety of organosulfur compounds at room temperature and from 0.2 to 2.0 Torr.

TL;DR: In this paper, the authors reported that upon excitation with visible light, optical elements made from silicon luminesce in the near-IR portion of the spectrum (1000 - 1300 nm).