Ultraviolet absorption spectra, structure, vibrations, and theoretical calculations of 2-fluoro- and 3-fluoropyridine in their electronic excited states

► The ultraviolet absorption spectra of 2-fluoro- and 3-fluoropyridine have been recorded and assigned. ► The vibrational frequencies of the S(n, π∗) and S(π, π∗) states have been assigned and compared to those of the ground state. ► Theoretical calculations were carried out to predict the vibrational frequencies for the ground and excited states. ► Theoretical calculations were used to predict the structures for the ground and excited states.