Fluorescence lifetimes of several structurally rigid t-stilbene derivatives

Fluorescence lifetimes of t-stilbene and its structurally rigid derivatives, i.e. substituted tetrahydrochrysenes, are reported. Single component fluorescence decays are observed for all these compounds. These t-stilbene derivatives show the same spectral features as found in a spectrum of t-stilbene recorded at 77 K but with lower transition energies. All the t-stilbene derivatives have significantly longer fluorescence lifetimes in accordance with that of t-stilbene at lower temperatures.