The photochemicalhydrogenabstraction of p-benzoylbenzoate ions (BPC) from aliphatic carboxylate ions in LDH (hydrotalcite) interlayers yielded a series of their 1:1 adducts. The product distributions were rather selective as well as distinctive from those of sodium salts and methyl esters in homogeneous solutions without LDH. These results have been discussed on the basis of their mutual disposition
Energy Transfer between <i>p</i>‐Benzoylbenzoate and Europium Ethylenediaminetetraacetate in Water Solution
作者:R. G. Charles、E. P. Riedel、P. G. Haverlack
DOI:10.1063/1.1726865
日期:1966.2.15
Ultraviolet radiation absorbed by the p-benzoylbenzoate (p-BB−) ion in solution is transferred to an appreciable extent to the europium ethylenediaminetetraacetate (EuEDTA−) ion and is re-emitted as the visible red fluorescence characteristic of Eu3+. Fluorescence intensity is greater in D2O than in water. The fluorescence is quenched by dissolved O2. Although evidence for mixed ligand complexes involving p-BB− and EuEDTA− was obtained, fluorescence seems to result from ultraviolet absorption by free p-BB− ions followed by intermolecular energy transfer to free EuEDTA− ions. The analogous water systems containing o-BB− or m-BB− are nonfluorescent, although all three of the solid hydrated salts Eu(o-BB)3, Eu(m-BB)3, and Eu(p-BB)3 fluoresce brightly at room temperature.
Organized Photocycloaddition of 4-Benzoylbenzoate with Unsaturated Carboxylates in Hydrotalcite Clay Interlayers
Photoirradiation of a mixture of 4-benzoylbenzoate (1) and 4-(2-phenylethenyl)benzoate yielded regioselective oxetanes in the presence of hydrotalcite clay. Similar irradiation of a mixture of 1 and cinnamate gave rise to β-truxinate, but not oxetane. The unexpected formation of oxetanes is understood by the favorable distance between C=O and C=C bonds packed in clay interlayers.