The dynamics of excited states in alpha,omega-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.
Fazzi D, Scotognella F, Milani A, Brida D, Manzoni C, Cinquanta E, et al. (2013). Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15(23), 9384-9391 [10.1039/c3cp50508a].
Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes
Fazzi D
;
2013
Abstract
The dynamics of excited states in alpha,omega-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
