Inorganic Seminar - Junhyeok (Jun) Seo

The Inorganic Seminar Series presents: Junhyeok (Jun) Seo

GIST

Host: Mike Rose

Title: Exploring PCET Pathways in Catalytic Reactions

Location: WEL 2.122

Refreshments served at 3:15pm

Proton-coupled electron transfer (PCET) is central to efficient proton reduction catalysis in transition metal complexes. This seminar covers how internal factors, such as metal-ligand identity, coordination geometry, and spin states, together with external influences like the proton source pK_a and applied potentials, collectively determine PCET pathways. Employing Co complexes as model systems, we reveal how their unique electrochemical properties enable selective control over exchange coupling interactions, directly influencing catalytic mechanisms. Further comparative studies highlight the role of spin states, demonstrating that high-spin Co complexes respond distinctively to proton sources with varying pK_a values. Additionally, we present groundbreaking results with low-spin Fe(II) complexes, where rapid two-electron transfers through ligand π* orbitals lead to unprecedented catalytic efficiency in hydrogen evolution, achieving turnover frequency significantly surpassing those of known catalyst complexes. These findings offer deep insights into tailoring PCET processes for optimized catalytic performance in hydrogen production.