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Pyrene based molecules are inclined to form excimers through self-associationupon photoexcitation. In this work, the pyrene core is functionalized withN-methylacetamide group at the position 1 or 2, to developpyren-1-methylacetamide (PyMA1) and pyren-2-methylacetamide (PyMA2),respectively. Upon photoexcitation, PyMA1 and PyMA2, at 1.0mM, in toluene, haveformed predominantly static excimers. The steady state spectroscopic studieshave showed that the excitonic coupling of PyMA1 dimers are much stronger insolution than its isomeric counterpart, PyMA2. The transient absorption (TA)measurements over fs-ps regime (fs-TA) showed that the formation of staticexcimers with the strongly-coupled pre-associated dimers, in PyMA1, happens inapprox. 560fs, whereas, the excimers for the weakly-coupled pre-associateddimers in PyMA2 have formed in much slower time scale (approx. 65ps). Theintroduction of methylacetamide group at the position 1 or 2 on pyrene ring,was believed to have allowed forming hydrogen bonded excimers with differentdegrees of excitonic coupling.

Ultrafast Processes in Isomeric Pyrene-N-methylacetamides: Formation of Hydrogen Bond Induced Static Excimers with Varied Coupling Strength