Photophysical anomalies of acridine in n-hexane

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Abstract
The picosecond risetime of the 430 nm Tn←T1 transient absorption and the T1 formation quantum yield for acridine in n‐hexane are temperature independent within experimental error between −51 and 25°C, in sharp contrast to the large temperature dependence of the fluorescing state of acridine in n‐hexane is not a kinetic precursor to T1. The absence of marked tempertaure dependence in the T1 formation yield presents and exception to the general observation that fluorescence and T1 yields both decrease with increasing temperature in N‐heterocycles and aromatic carbonyls with closely spaced lowest‐‐energy n, π* and π, π* singlet states. (AIP)