A new system of photon-gated persistent spectral hole burning material for frequency-domain optical storage

Two-color persistent spectral hole-burning was achieved for the first time for a new system Zn-tetrabenzoporphin-crotonic acid/phenoxy resin at 20 K. The time dependence experiments show that the spectral holes are persistent at the temperature of 20 K. These holes can be erased by laser irradiation and reversible holeburning is performed. The hole width remains almost constant during the erasing process.     

Photochemistry in polymer solids—4. On the intensity dependence of non-exponential decay of benzophenone phosphorescence in poly(methyl methacrylate)

Change in the intensity of the irradiation laser pulse did not influence the non-exponential decay profile of benzophenone phosphorescence in poly(methyl methacrylate) at 20°. This result is incompatible with the biphotonic triplet-triplet annihilation process, but supports the diffusion-controlled dynamic quenching mechanism including non-equilibrium √t term.     

Cyclohexanol dehydrogenation over Cu/SiO2 and CuO/SiO2: A comparison

Various CuO/SiO₂ catalysts were prepared and characterized by XRD, surface area and metal area measurements. While dehydrogenation activity for cyclohexanol was observed at 473–573 K on reduced catalysts, it was observed only at 573 K on the unreduced catalyst.IICT Communication No: 3261     

New procedure to mask the 2,3-pi bond of the indole nucleus and its application to the preparation of potent opioid receptor agonists with a Corynanthe skeleton

Treatment of indole alkaloids with hypervalent iodine in the presence of ethylene glycol provides 2,3-ethylene glycol bridged adducts that could be converted into the original indoles under mild reductive conditions. This procedure, which involves masking of the reactivity of the indole nucleus at the beta-position, was utilized for the modification of the benzene ring of the indoline derivative and was applied to the preparation of potent opioid receptor agonists with the Corynanthe skeleton. [reaction: see text]     

Control of ionic conductivity of ionic liquid/photoresponsive poly(amide acid) gels by photoirradiation

1,3-Dibutylimidazolium bromide was soaked into a polymer network prepared by condensation of 4-4'-diaminoazobenzene, pyromellitic dianhydride and 1,3,5-tri(4-aminophenyl)benzene to form photoresponsive ion conductive gels.     

The reactions of the Criegee intermediate CH3 CHOO in the gas-phase ozonolysis of 2-butene isomers

Ozonolysis of cis- and trans-2-butene isomers were carried out in a 570 l spherical glass vessel in 730 torr synthetic air at 295 ± 3 K. The initial concentrations were 5 to 10 ppmv for the isomers and 2 to 5 ppmv for ozone. Quantitative yields were determined by FTIR spectroscopy for CH₃CHO, HCHO, CH₄, CH₃OH, CO, and CO₂. By means of computational subtraction of the spectral contribution of the identified products from the product spectra, residual spectra have been obtained. Formation of 2-butene ozonide, propene ozonide, and l-hydroperoxyethyl formate CH₃CH(OOH)(SINGLE BOND)O(SINGLE BOND)CH(O) have been identified in the residual spectra. These products have been shown to be formed in the reactions of the Criegee intermediate CH₃CHOO with CH₃CHO, HCHO, and HCOOH, respectively. Mechanistic implications and atmospheric relevance of these observations are discussed. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 461–468, 1997.