Triplet Excited State
Behavior of Naphthalene-Based
Pseudopeptides in the Presence of Energy Donors
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Abstract
In this work, the triplet state behavior of naphthalene-based
pseudopeptides
with amide-based macrocyclic or lateral chain substructures has been
investigated in the presence of benzophenone and/or biphenyl, as suitable
energy-donating chromophores. Their behavior has been compared with
that of 1,4-dimethylnaphthalene as model compound. In all the cases,
the triplet–triplet absorption of naphthalene is detected by
transient absorption spectroscopy, upon selective excitation of benzophenone
at 355 nm. The kinetics of formation and decay of this species is
markedly slower in the pseudopeptides, due to retardation of triplet–triplet
energy transfer and exciplex formation. Finally, the delayed fluorescence
detected in the model naphthalene is absent in the pseudopeptides.
The concept can, in principle, be exploited for the study of excited-state
interactions in supramolecular systems