Detailed photophysical properties of a functionalized ruthenium(II) polypyridyl complex: through-space solvent effects
Abstract
The
synthesis and detailed photophysical properties of a bis(N-methylene-4-pyridinium-4′-pyridine)-functionalized ruthenium(II)
polypyridyl complex in solvents of varying polarity and Gutmann's donor number (DN) are reported, along with
its single-crystal X-ray structure. The emission spectrum of the complex in varying solvents was also simulated
and parameters, including the Huang–Rhys (Sm) electron-vibrational coupling constant, obtained. Reasonable
correlations of the optical properties with the solvent polarity factor (Δf) and DN were observed. A difference
in dipole moment between the ground and excited states of ca. 10 D was calculated, and a simplified potential-energy
surface model proposed to explain the results. Excited state lifetimes in acetonitrile were determined
over a modest temperature range of 60 K. The linear Arrhenius plot of ln(kobs) s. 1/T gave an activation energy
of 5.6(±0.6) kJ mol−1,
which is low
when compared to the literature value of 45.5 kJ mol−1 for [Ru(bipy)3]2+.