Abstract
Dibenzotropylium ion (DT +) has been generated as an indefinitely persistent species within the channels of ZSM-5 in its H +-form. Diffuse reflectance laser flash photolysis has allowed detection of a transient (two bands: 300 nm, sharp and ∼440 nm broad) decaying in the μs time-scale that has been assigned to the corresponding triplet excited state. The tight fit of DT + within the straight channels ( 5.2×5.7 A ̊ 2 ) of ZSM-5 and the presence of coadsorbed water explain why the DT + triplet excited state is not quenched by oxygen but interacts with triethylamine, which is highly water-soluble. In the latter case, formation of a new transient compatible with DT ( λ max=270 and 350 nm) through electron transfer from the amine to DT + triplet is observed.
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