Showing papers in "Journal of Photochemistry in 1986"

TL;DR: In this paper, photochromism of coumarin-substituted chromenes (xanthyletin and seselin) was observed in about 800 ns.

TL;DR: In this article, the photoreduction of phenylglyoxylic acid (1) in aqueous solution is recommended as a convenient chemical actinometer (φ ≈ 0.6 − 0.8) for the region 250 - 400 nm.

TL;DR: In this article, the authors present a Web of Science Record created on 2006-02-21, modified on 2017-05-12, for the LPI-ARTICLE-1986-005.

TL;DR: The solvent and pH dependence of the absorption and fluorescence of 2-(2′-hydroxyphenyl)benzoxazole was studied in this paper, where four different species were observed in both ground and excited states: the anion, the neutral molecule with intramolecular hydrogen bonding, the monocation and the dication.

TL;DR: The photophysical properties of 9,10-diphenylanthracene (DPA) are found to be unusual in perfluoro-nhexane (PFH) compared with other solvents as mentioned in this paper.

TL;DR: The photophysical properties of aluminium(III) and zinc(II) sulphonated naphthalocyanines have been compared with those of the corresponding metallophtholic compounds, leading to the conclusion that the former class of compounds may be useful as sensitizers in certain applications as discussed by the authors.

TL;DR: While the fluorescence of xanthone, thioxanthone and N-methylacridone shows the customary red shift with increasing solvent polarity, as measured by a polarization function, indicating an increase in dipole moment on excitation, the triplet-triplet (T1Tn) absorption spectra are strongly blue shifted, indicating a decrease in dipoles moment on the excitation as discussed by the authors.

TL;DR: The photochemical behavior of stilbenes and alkyl cinnamates complexed to cyclodextrin has been investigated in aqueous media as discussed by the authors, showing that on direct excitation, the photostationary state of the stilbene, p-methylstilbenes, pmethoxystilbines and p-fluorostilbens contains predominantly the cis isomer (greater than 85%).

TL;DR: In this paper, a number of new thioxanthone derivatives have been used for photopolymer applications, such as in the [2 + 2]-cycloaddition of homopolymers with pendent dimethylmaleimide groups and in the radical-initiated polymerization of acrylic monomers.

TL;DR: In this article, the yields of the photochemical and thermal rearrangement reaction have been determined for 13 endoperoxides of the anthracene and tetracene series, and it was shown that a strong substituent effect operates on Qdec(S1) and Adec, which are closely correlated.

TL;DR: In this article, the photochemical and thermal isomerization of Schiff bases derived from o-hydroxybenzaldehydes and aromatic or aliphatic diamines was investigated.

TL;DR: In this paper, the quenching mechanism of singlet oxygen luminescence at 1.27 μm by different aliphatic and aromatic nitroxy radicals has been studied and it has been concluded that 1 O 2 quench by radicals occurs exclusively via the electron exchange interaction in collision complexes.

TL;DR: In this paper, the authors show that 2-naphthyl-substituted 1,3-diketoboronates exhibit high fluorescence quantum yields.

TL;DR: An efficient photocatalytic dispersion has been developed from CdS and a 0.2 wt.% rhodium(III) salt via photodeposition.

TL;DR: In this paper, the results of the 366 nm photolyses of α-chloroanthraquinones were interpreted in terms of the following consecutive reactions: 1,5-dichloroanthrasemiquinone or 1,8-dicloroquinone, 1-5-Dichloro and 1-8-Dicloquinone anthraquinone.

TL;DR: In this paper, the α-Phenoxyacetophenone photodecomposes with a quantum yield of about 0.004 to yield C6H5COCH2 and C 6H5O; in spite of its low quantum yield the process is quite rapid, occurring with an estimated rate constant of 3 × 107 s−1.

TL;DR: In this article, the authors characterized the visible absorption and fluorescence spectra and quantum yields of the dicarboxylate and anhydride forms of the mono(n)-octylimide derivative of 3,4,9,10-perylenetetetricarboxylic dianhydride in aqueous micellar and organic solvent media.

TL;DR: In this article, the transient difference spectrum of the absorption has a maximum that is slightly red shifted from the ground state absorption edge of TiO 2 at room temperature, and a faster decay is observed at long wavelengths than at shorter ones.

TL;DR: The φ for 1O2 formation obtained via the relative actinometric method is dependent on the quencher concentration when photo-oxidations in different solvents are compared as mentioned in this paper.

TL;DR: In this paper, the triplet state properties and photodimerization kinetics of a number of photo-cross-linkable polymers are studied and the energy transfer method is applied to determine the three-state energies and the extent of configurational changes between the ground and the triplets states of these compounds.

TL;DR: In this article, the N,N -dimethylaniline-(DMA)-photosensitized dechlorination of monochlorobenzene, ortho -, meta - and para -dichlorobensene and 3,4-dich chlorotoluene was studied in methanolic solutions by means of continuous photolysis at 313 nm.

TL;DR: In this paper, the hydrogen-atom abstraction of 1,5-dichloroanthraquinone in ethanol at room temperature was studied by picosecond and nanosecond laser photolysis.

TL;DR: In this article, the authors show that photoenolization competes with α scission, and transient spectra were observed which were assigned to the excited triplet ( k = 3 × 10 7 s −1 ) and to the ground state (k = (3 × 10 5 ) - (1.5 × 10 4 ) s − 1 ) of the enols.

TL;DR: In this article, the primary processes in the photodecomposition in the vacuum UV of the unsaturated hydrocarbons acetylene and ethylene have been investigated and the formation of electronically excited triplet vinylidene (H2CC) radicals is shown to be a major process.

TL;DR: In this article, the transient absorption of RO 2 radicals was monitored and quantum yields were obtained at 293.7, 302.0, 311.7 and 325.1 nm incident radiation.

TL;DR: In this article, it was shown that 4-N,N -dimethylaminobenzonitrile and related compounds in acetonitrile or water at 308 nm leads to formation of radical cations of the solutes.

TL;DR: In this article, the formation of triethylamine with ethanol and with deuterated ethanol at low alcohol concentrations in hydrocarbon solutions is shown by steady state and time-resolved fluorescence spectroscopy.

TL;DR: In this article, the reactivity of Coumarin 311 and various oxidized states of molecular oxygen with both the 1Δ and 1Σ states of oxygen was determined.

TL;DR: In this article, the authors investigated the fluorescence energy, shape of fluorescence spectrum and fluorescence efficiency of 9-anthramide and N,N-diethyl-9-anthrameride as a function of solvent.