Influence of Donor-Acceptor Interactions on MLCT Hole Reconfiguration in {Ru(bpy)} Chromophores

Cotic A, Heinemann FW, Slep LD, Cadranel A (2024)

Publication Type: Journal article

Publication year: 2024

Journal

DOI: 10.1002/cphc.202400246

Abstract

In MLCT chromophores, internal conversion (IC) in the form of hole reconfiguration pathways (HR) is a major source of dissipation of the absorbed photon energy. Therefore, it is desirable to minimize their impact in energy conversion schemes by slowing them down. According to previous findings on {Ru(bpy)} chromophores, donor-acceptor interactions between the Ru ion and the ligand scaffold might allow to control HR/IC rates. Here, a series of [Ru(tpm)(bpy)(R-py)]²⁺ chromophores, where tpm is tris(1-pyrazolyl)methane, bpy is 2,2’-bipyridine and R-py is a 4-substituted pyridine, were prepared and fully characterized employing electrochemistry, spectroelectrochemistry, steady-state absorption/emission spectroscopy and electronic structure computations based on DFT/TD-DFT. Their excited-state decay was monitored using nanosecond and femtosecond transient absorption spectroscopy. HR/IC lifetimes as slow as 568 ps were obtained in DMSO at room temperature, twice as slow as in the reference species [Ru(tpm)(bpy)(NCS)]⁺.

Authors with CRIS profile

Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie Alejandro Cadranel

Involved external institutions

Universidad de Buenos Aires (UBA) / University of Buenos Aires

Argentina (AR)

How to cite

APA:

Cotic, A., Heinemann, F.W., Slep, L.D., & Cadranel, A. (2024). Influence of Donor-Acceptor Interactions on MLCT Hole Reconfiguration in {Ru(bpy)} Chromophores. ChemPhysChem. https://doi.org/10.1002/cphc.202400246

MLA:

Cotic, Agustina, et al. "Influence of Donor-Acceptor Interactions on MLCT Hole Reconfiguration in {Ru(bpy)} Chromophores." ChemPhysChem (2024).

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