Environmental effects on triplet lifetimes of some aromatic hydrocarbons at 77°K

Publisher Website
Google Scholar
Abstract
The triplet lifetimes of a number of aromatic molecules dissolved in solid matrices at 77°K have been measured using a method of flash excited luminescence. Statistical methods were employed which gave an accuracy of ±1 % for the reported lifetimes. The lifetimes of the aromatic species were constant in a range of n-aliphatic hydrocarbons. In n-heptane the lifetimes were in sec: phenanthrene 3.18; chrysene 2.44; fluorene 6.33; carbazole 7.16; dibenzothiophene 1.28. The lifetimes of these aromatics in a range of n-aliphatic alcohol solvents altered with the chain length of the solvent; a maximum lifetime was observed at n-propanol in each case followed by a decrease in lifetimes as the chain length increased. These changes in lifetime have been correlated with changes in the order and molecular packing of the solvent, which are believed to alter the radiationless decay process.

This publication has 0 references indexed in Scilit: