A considerable improvement of the photophysical properties of DBD dyes was achieved by replacement of one or two oxygen atoms of the heterocyclic core by sulfur atoms (S1 and S2 DBD dyes). In contrast to the previously developed S4 DBD dyes, long fluorescence lifetime and satisfactory fluorescence quantum yields are preserved. Moreover, the improved synthetic accessibility of S1 and S2 DBD dyes must
FRET Pairs with Fixed Relative Orientation of Chromophores
作者:Pablo Wessig、Nicole Behrends、Michael U. Kumke、Ursula Eisold
DOI:10.1002/ejoc.201600489
日期:2016.9
oligospirothioketal (OSTK) Forster resonance energy transfer (FRET) constructs are described and the photophysics of these constructs were explored in different solvents. The FRET efficiencies were determined from the experimental data and compared with theoretical values. The influence of the outstanding rigidity of the novel OSTK compounds on the FRET is discussed.
Photooxidation of Propene to Propene Oxide by Molecular Oxygen over Zinc Oxide Dispersed on Silica
作者:Hisao Yoshida、Chizu Murata、Tadashi Hattori
DOI:10.1246/cl.1999.901
日期:1999.9
Dispersed zincoxide species on silica, which exhibited different UV-vis absorption spectrum from bulk ZnO, promoted selective photooxidation of propene by molecular oxygen to propeneoxide.
A new practical method for ketalization or oxy-Michael/ ketalization was developed using the high-pressure-promoted condensation of ketones or α,β-unsaturated ketones with alcohols in the presence of trialkyl orthoformates as water scavengers.