Reference

Kinetic fluorometric determination of cerium with 1,5-diphenyl-3-(2-styryl)-D2-pyrazoline

Kinetic fluorometric determination of cerium with 1,5-diphenyl-3-(2-styryl)-D2-pyrazoline. Grases, F.; Genestar, C.; March, J. G. (Fac. Sci., Univ. Palma de Mallorca, Palma de Mallorca, Spain). Microchem.There are some reagents with their cas registry numbers 7440-45-1 and 2515-62-0 are used in this study. J., 29(2), 237-42 (English) 1984. CODEN: MICJAN. ISSN: 0026-265X. DOCUMENT TYPE: Journal CA Section: 79 (Inorganic Analytical Chemistry) A kinetic fluorometric method for the detn. of 0.04-0.2 ppm Ce(IV) is described. The fluorescent species obtained results from the oxidn. of 1,5-diphenyl-3-(2-styryl)-D2-pyrazoline (I). The optimum conditions were: 1.25M HCl, 6.2 ′ 10-6M I, and 15% EtOH medium with excitation and emission wavelengths of 360 and 510 nm, resp. V(V), Au(III), Pt(IV), and Fe(III) interface. .

Diffuse reflectance flash photolysis

Diffuse reflectance flash photolysis.Some chemicals with cas registry numbers like 260-94-6 and 2515-62-0 are also used. Wilkinson, Francis (Dep. Chem., Univ. Technol., Loughborough LE11 3TU, UK). J. Chem. Soc., Faraday Trans. 2, 82(12), 2073-81 (English) 1986. CODEN: JCFTBS. ISSN: 0300-9238. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Examples are given demonstrating recent progress which allows flash photolysis investigations of opaque materials by using diffuse reflectance from analyzing sources for transient detection. Exptl. details of a nanosecond diffuse reflectance laser flash photolysis system are presented. The limitations assocd. with the use of integrating spheres for collecting the analyzing light are discussed. The decay of transient absorption and time-resolved spectra are reported for triplet states in microcrystals (benzil), adsorbed as a fraction of a monolayer on powd. silica (acridine) and dyed on cotton fabric (aluminum sulfonated phthalocyanine). Photoinduced changes in diffuse reflectance of Co-doped ZnO are also reported and tentatively assigned. The relation between the measured changes in diffuse reflectance and the distribution of transients below the irradiated surface is discussed and equations which can be applied in 2 limiting cases are given. The first observation of a transient absorption on the picosecond timescale from an opaque sample is presented. The potential of the technique for studying the mechanism of heterogeneous photoreactions is stressed. .