6533b871fe1ef96bd12d22e9
RESEARCH PRODUCT
Konvergenz von Absorption und Fluoreszenz bei gekreuzt konjugierten Oligomeren aus Chalkon-Bausteinen
Heinz KolshornHerbert MeierHarald AustDirk Ickenrothsubject
chemistry.chemical_compoundCrystallographyChalconechemistryAtomic electron transitionBathochromic shiftAbsorption (chemistry)PhotochemistryEnoneFluorescence spectraFluorescencedescription
The absorption and fluorescence spectra of two series of chalcone oligomers (1a–d) and (2a–d) are reported. Due to small or vanishing orbital coefficients (HMO calculation) within the cross-conjugated systems, the bathochromic shifts caused by the extension of the chains are modest. The effective conjugation lengths amount to 6 and 14 chalcone building blocks in the absorptions of the series 1 and 2. The convergence of the fluorescence bands is already reached in 1d and 2d with 4 and 8 enone units, respectively. Besides the uniform or alternate arrangement of the chalcone building blocks, the positions of the propoxy substituents show a considerable influence on the electronic transitions provided that push–pull effects are operating.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-08-01 | Journal für praktische Chemie |