Tracking The Reaction Coordinate Of Ultrafast Spin-crossover In Fe(ii) Complexes With Femtosecond M-edge Xanes

Ash, Ryan T

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https://hdl.handle.net/2142/111390 Copy

Description

Title

Tracking The Reaction Coordinate Of Ultrafast Spin-crossover In Fe(ii) Complexes With Femtosecond M-edge Xanes

Author(s)

Ash, Ryan T

Contributor(s)

• Vura-Weis, Josh
• Zhang, Kaili

Issue Date

2021-06-24

Keyword(s)

Dynamics and kinetics

Abstract

Designing earth-abundant photosensitizers to replace rare-earth complexes is of high importance for the efficient collection and utilization of solar energy. The primary obstacle to using first-row transition metal complexes is the ultrafast dissipation of collected energy due to low energy metal-centered states. Here, we study a series of Fe(II) complexes with different ligand frameworks in hopes to alter the intersection between various metal-centered states. Using femtosecond M-edge XANES, the involvement of triplet and quintet metal-centered states are identified. By decoupling the axial and equatorial stretching modes of an Fe(II) complex, we find that the lifetime of a triplet metal-centered state is significantly increased due to Jahn-Teller distortion in the excited state. This behavior is not observed in prototypical Fe(II) polypyridyl complexes, and provides a method to reduce energy losses in earth-abundant photosensitizers.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111390

DOI

10.15278/isms.2021.RJ02

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