Interfacial electron transfer of perylenes: Influence of the anchor binding mode

Han Yan; Ryan Harmer; Binish Zafar; Elena Galoppini; Lars Gundlach

doi:10.1063/5.0185342

Interfacial electron transfer of perylenes: Influence of the anchor binding mode

J Chem Phys. 2024 Jan 21;160(3):034706. doi: 10.1063/5.0185342.

Authors

Han Yan¹, Ryan Harmer², Binish Zafar², Elena Galoppini², Lars Gundlach¹

Affiliations

¹ Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
² Department of Chemistry, Rutgers University Newark, Newark, New Jersey 07102, USA.

PMID: 38235795
DOI: 10.1063/5.0185342

Abstract

Interfacial electron transfer (IET) through saturated single-linker and dual-linker groups from a perylene chromophore into nanostructured TiO2 films was studied by ultrafast spectroscopy. Perylene chromophores with one and two propanoic acid linker groups in the peri and ortho positions were investigated. In comparison to previously studied perylenes bound via unsaturated acrylic acid linkers, the chromophores with saturated linkers showed bi-exponential IET dynamics. Two distinct transfer times were observed that indicate the presence of two concurrent binding modes. A comparison between ortho- and peri-substituted sensitizers resulted in slower IET dynamics and weaker electronic coupling for ortho substitution. Finally, IET from sensitizers with saturated linker groups is neither promoted nor hindered by a second linker group. This indicates that only one of the two linkers binds covalently to the surface. This study reveals the importance of the anchor-binding mode and design considerations of the linker for regulating IET.