Nitrostilbenes fluorescence

Fluorescence Quantum Yields. For tram-stilbcne 4>f is independent of lexc and the concentration (typically < 10 4 M) and only slightly reduced by the presence of c/s-stilbene [13, 81, 99, 240, 241, 294]. The liquid solutions at room temperature f is about 0.04 for trons-stilbene and 4-bromostilbene, and larger for 4-chlorostilbene and several cyanostilbenes. For nitrostilbenes very small, but there are exceptions in the presence of an electron... 

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