Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes.
نویسندگان
چکیده
The dynamics of excited states in α,ω-dinaphthylpolyyne, a class of linear sp-carbon chains, has been investigated by ultrafast transient absorption spectroscopy and DFT//TDDFT calculations. We show that the role of molecular conformers, in which end-capped naphthalene rings are planar or perpendicular to the polyyne plane, is fundamental for understanding both the steady state properties, such as UV-Vis absorption spectra and vibronic transitions, and the ultrafast transient absorption features. In particular, we observed in one of the conformers the ultrafast formation of a narrow photo-induced absorption band rising within 30 ps. This band can be assigned to an inter-system crossing event leading to the formation of triplet excited states.
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عنوان ژورنال:
- Physical chemistry chemical physics : PCCP
دوره 15 23 شماره
صفحات -
تاریخ انتشار 2013