Showing papers on "Photochemistry published in 2007"

Photochemistry and photophysics of coordination compounds

Abstract: J.P. Leonard, C.B. Nolan, F. Stomeo, T. Gunnlaugsson: Photochemistry and Photophysics of Coordination Compounds: Lanthanides.- R.A. Kirgan, B.P. Sullivan, D.P. Rillema: Photochemistry and Photophysics of Coordination Compounds: Rhenium.- D. Kumaresan, K. Shankar, S. Vaidya, R.H. Schmehl: Photochemistry and Photophysics of Coordination Compounds: Osmium.- L. Flamigni, A. Barbieri, C. Sabatini, B. Ventura, F. Barigelletti: Photochemistry and Photophysics of Coordination Compounds: Iridium.- J.A.G. Williams: Photochemistry and Photophysics of Coordination Compounds: Platinum - Excited States and Luminescence.- V. W.-W. Yam, E. C.-C. Cheng: Photochemistry and Photophysics of Coordination Compounds: Gold

Elementary reactions involved in pollutant-forming mechanisms

Abstract: The reactions of the hydroxyl radical (OH) with molecular chlorine (Reaction 1), methane (Reaction 2), and propane (Reaction 3) have been studied experimentally using a pulsed laser photolysis/pulsed-laser-induced fluorescence technique over wide ranges of temperatures (297826, 298-1009, and 296-908 K, respectively) and at pressures between 6.68 and 24.15 kPascals. The rate coefficients for these reactions exhibit no dependence on pressure and exhibit positive temperature dependences that can be represented with modified three-parameter Arrhenius expressions within their corresponding temperature ranges: k1 = 3.59 x 10Texp(745K/T)cmmoleculesec, k2 = 3.82 x 10T exp(-1136K/T)cmmoleculesec, and k3 = 6.64 x 10T exp(-271K/T)cmmoleculesec. For the OH + Cl2 reaction, the potential energy surface has been studied using quantum chemical methods which suggests OH + Cl2 HOCl + Cl as the main channel of this reaction. Density Functional Theory (DFT) along with Quadratic Configuration Interaction (QCISD(T)//DFT) calculations, with single, double, and triple electronic excitations, for the energetics of formation, stability, and reactivity of ortho-semiquinone, para-semiquinone, and the chloro-phenoxyl radicals have been performed using the 6-31G(d,p) basis set. Formation of these radicals from potential molecular precursors catechol, hydroquinone, and the chlorophenols is readily achieved under combustion conditions through unimolecular scission of the phenoxyl-hydrogen bond or abstraction of the phenoxyl hydrogen by a hydrogen atom or hydroxyl radical. The resulting radicals are resonance stabilized and resist decomposition and oxidation. The calculations strongly suggest that combustion-generated semiquinone and chloro-phenoxyl radicals are sufficiently stable and resistant to oxidation to be considered persistent in the atmospheric environment.

Xanthene/Benzoxanthene Dyes: Novel Synthetic Metholologies, Applications in Molecular Recognition, Cellular Imaging and the Design of a Tunable White (RGB) Light Emitter

Abstract: .......................................................................................xiv CHAPTER 1 MILD COLORIMETRIC DETECTION OF SIALIC ACID ...............1 1.