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  Manipulating charge transfer excited state relaxation and spin crossover in iron coordination complexes with ligand substitution.

Zhang, W., Kjær, K. S., Alonso-Mori, R., Bergmann, U., Chollet, M., Fredin, L. A., et al. (2017). Manipulating charge transfer excited state relaxation and spin crossover in iron coordination complexes with ligand substitution. Chemical Science, 8(1), 515-523. doi:10.1039/C6SC03070J.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-256D-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-57DD-5
Genre: Journal Article

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 Creators:
Zhang, W., Author
Kjær, K. S., Author
Alonso-Mori, R., Author
Bergmann, U., Author
Chollet, M., Author
Fredin, L. A., Author
Hadt, R. G., Author
Hartsock, R. W., Author
Harlang, T., Author
Kroll, T., Author
Kubicek, K.1, Author              
Lemke, H. T., Author
Liang, H. W., Author
Liu, Y., Author
Nielsen, M. M., Author
Persson, P., Author
Robinson, J. S., Author
Solomon, E. I., Author
Sun, Z., Author
Sokaras, D., Author
van Driel, T. B., AuthorWeng, T. C., AuthorZhu, D., AuthorWarnmark, K., AuthorSundstrom, V., AuthorGaffney, K. J., Author more..
Affiliations:
1Research Group of Structural Dynamics of (Bio)chemical Systems, MPI for biophysical chemistry, Max Planck Society, ou_578564              

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 Abstract: Developing light-harvesting and photocatalytic molecules made with iron could provide a cost effective, scalable, and environmentally benign path for solar energy conversion. To date these developments have been limited by the sub-picosecond metal-to-ligand charge transfer (MLCT) electronic excited state lifetime of iron based complexes due to spin crossover – the extremely fast intersystem crossing and internal conversion to high spin metal-centered excited states. We revitalize a 30 year old synthetic strategy for extending the MLCT excited state lifetimes of iron complexes by making mixed ligand iron complexes with four cyanide (CN−) ligands and one 2,2′-bipyridine (bpy) ligand. This enables MLCT excited state and metal-centered excited state energies to be manipulated with partial independence and provides a path to suppressing spin crossover. We have combined X-ray Free-Electron Laser (XFEL) Kβ hard X-ray fluorescence spectroscopy with femtosecond time-resolved UV-visible absorption spectroscopy to characterize the electronic excited state dynamics initiated by MLCT excitation of [Fe(CN)4(bpy)]2−. The two experimental techniques are highly complementary; the time-resolved UV-visible measurement probes allowed electronic transitions between valence states making it sensitive to ligand-centered electronic states such as MLCT states, whereas the Kβ fluorescence spectroscopy provides a sensitive measure of changes in the Fe spin state characteristic of metal-centered excited states. We conclude that the MLCT excited state of [Fe(CN)4(bpy)]2− decays with roughly a 20 ps lifetime without undergoing spin crossover, exceeding the MLCT excited state lifetime of [Fe(2,2′-bipyridine)3]2+ by more than two orders of magnitude.

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Language(s): eng - English
 Dates: 2016-08-252017-01-01
 Publication Status: Published in print
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 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C6SC03070J
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Title: Chemical Science
Source Genre: Journal
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Pages: - Volume / Issue: 8 (1) Sequence Number: - Start / End Page: 515 - 523 Identifier: -