Einfluss intramolekularer Bewegungen auf die Fluoreszenzquantenausbeute

Influence of intramolecular movements on the fluorescence quantum yield. The conditions determining the influence of the movements of different parts of molecules on the fluorescence quantum yield are shown. In the following we discuss four types of intramolecular movements that can help attain the desired fluorescent properties. In the case of methinecyanine dyes such intramolecular movements are responsible for the strong dependence of the fluorescence quantum yield on the solvent viscosity we have observed.     

Ueber den Einfluss der Temperatur auf die Empfindlichkeit der Spectral-Reactionen

Ohne Zusammenfassung     

Ueber den Einfluss einiger Medicamente auf die Analyse des Harnes

Ohne Zusammenfassungz. Z. Assistent an d. kais. Versuchsstat. f. Elsass-Lothringen zu Colmar.(Aus dem chemischen Laboratorium des pathologischen Instituts zu Berlin).     

Ueber den Einfluss der Temperatur auf die Angaben der Saccharimeter

Ohne Zusammenfassung     

Photochemische Reaktionen 130. Mitteilung. Zur Photochemie von 5,6-Epoxy-1,3-dienen: Der Einfluss eines 7-Hydroxysubstituenten auf die Carbenbildung

Photochemistry of 5,6-Epoxy-1,3-dienes: Influence of a 7-Hydroxy Substituent on the Carbene Formation On singlet excitation (λ=254 nm) in MeCN the hydroxy-epoxydiene (E)- 4 undergoes photocleavage to the carbene intermediates d and e as main processes. The carbene d , showing behaviour typical of vinyl carbenes, undergoes addition to the adjacent double bond furnishing the cyclopropenes 5A + B. The carbene e , however, undergoes an insertion reaction into the neighbouring carbinol C,H-bond leading to the enol intermediate 21 , which gives rise to the compounds 6A + B and 7A + B. To a lesser extent the products 8A + B are formed via another enol intermediate (32). On photolysis of (E)- 4 in MeOH instead of MeCN the enol intermediates 21 and 32 undergo rapid tautomerisation to the ketones 9A + B (main products) and 11.