Photophysical properties of organometallic complexes: Substituent effects

The literature data on the substituent influence on such properties, P, as the wavenumber maxima, νabs and νem, extinction coefficients, ε, in the UV–Vis electronic spectra, as well as the quantum yields, Φem, and emission lifetimes, τ, for 31 series of organometallic complexes have been considered using correlation analysis. The P properties were first established to depend not only on the inductive and resonance effects but also on the polarizability of the substituent. The polarizability effect consists of an electrostatic attraction between the charge arising on the reaction centre owing to the change of electron distribution in the excited state and the dipole moments induced by this charge in the substituents. In specific cases, the polarizability effect has a dominant influence on the P properties. An understanding of the substituent effects may be useful for the design of devices based on the application of photophysical processes.

The literature data on the substituent influence on photophysical properties P (wavenumber maxima νabs and νem, extinction coefficients ε in the UV–Vis electronic spectra, the quantum yields Φem, emission lifetimes τ) for 31 series of organometallic complexes have been considered using correlation analysis. The P properties were first established to depend not only on inductive and resonance effects but also on the polarizability of the substituent.Figure optionsDownload as PowerPoint slide