Speaker
Description
Prof. Barbara Machura
Transition metal complexes that exhibit enhanced absorption in the visible spectral region, high intersystem crossing (ISC) efficiency, and extended triplet excited-state lifetimes are highly promising candidates for use as photosensitizers. Such systems are particularly advantageous for applications in photocatalysis, photodynamic therapy (for generation of singlet oxygen or reactive oxygen species, ROS), and triplet-triplet annihilation upconversion (TTA UC) where low-energy light is converted into light of higher energy. Recent studies have shown that prolonging excited-state lifetimes in transition metal complexes can be achieved through population of triplet ligand-centered (³LC) states or formation of intraligand charge-transfer (³ILCT) states. In practice, this is accomplished by incorporating p-conjugated organic chromophores that possess long-lived non-emissive triplet states, as well as by introducing strong electron-donating organic substituents. This lecture will highlight correlations between ligand structural features and the resulting photophysical properties of transition metal complexes, with particular emphasis on their potential utility in aforementioned modern technologies.