The emission properties of some aza-stilbenes (2-, 3- and 4-styrylpyridine) and thio-stilbenes [2- and 3-styrylthiophene and 1,2-di-(3-thienyl)ethene] have been investigated after inclusion in commercial (Nay) and cation-exchanged (TIY) faujasite zeolites to get information on the triplet properties through population of the T(1) state induced by the heavy atom effect. The fluorescence properties in NaY and TIY were compared with those reported in solution. The phosphorescence spectra, observed in TIY at liquid nitrogen temperature, allowed the energy levels of the T(1) states to be obtained. Phosphorescence lifetimes were also measured. Their comparison with the lifetime known for stilbene showed that the radiative decay is little affected by the heteroatoms.
Induced phosphorescence of some aza- and thio-stilbenes embedded in thallium-exchanged zeolites
CIORBA, SERENA;MAZZUCATO, Ugo;SPALLETTI, Anna
2011
Abstract
The emission properties of some aza-stilbenes (2-, 3- and 4-styrylpyridine) and thio-stilbenes [2- and 3-styrylthiophene and 1,2-di-(3-thienyl)ethene] have been investigated after inclusion in commercial (Nay) and cation-exchanged (TIY) faujasite zeolites to get information on the triplet properties through population of the T(1) state induced by the heavy atom effect. The fluorescence properties in NaY and TIY were compared with those reported in solution. The phosphorescence spectra, observed in TIY at liquid nitrogen temperature, allowed the energy levels of the T(1) states to be obtained. Phosphorescence lifetimes were also measured. Their comparison with the lifetime known for stilbene showed that the radiative decay is little affected by the heteroatoms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
