Brückner, C., Chaudhri, N., Nevonen, D.E. et al. (10 more authors) (2021) Structural and photophysical characterization of all five constitutional isomers of the octaethyl‐β,β′‐dioxo‐bacterio‐ and ‐isobacteriochlorin series. Chemistry – A European Journal, 27 (65). pp. 16189-16203. ISSN 0947-6539
Abstract
It is well-known that treatment of β-octaethylporphyrin with H2O2/conc. H2SO4 converts it to a β-oxochlorin as well as all five constitutional isomers of the corresponding β,β’-dioxo-derivatives: two bacteriochlorin-type isomers (β-oxo groups at opposite pyrrolic building blocks) and three isobacteriochlorin-type isomers (β-oxo-groups at adjacent pyrrolic building blocks). By virtue of the presence of the strongly electronically coupled β-oxo auxochromes, none of the chromophores are archetypical chlorins, bacteriochlorins, or isobacteriochlorins. Here the authors present, inter alia, the single crystal X-ray structures of all free-base diketone isomers and a comparative description of their UV-vis absorption spectra in neutral and acidic solutions, and fluorescence emission and singlet oxygen photosensitization properties, Magnetic Circular Dichroism (MCD) spectra, and singlet excited state lifetimes. DFT computations uncover underlying tautomeric equilibria and electronic interactions controlling their electronic properties, adding to the understanding of porphyrinoids carrying β-oxo functionalities. This comparative study lays the basis for their further study and utilization.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Wiley-VCH GmbH. |
Keywords: | β-oxoporphyrinoids; bacteriochlorins; electronic structure; octaalkylporphyrins; isobacteriochlorins |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/R045305/1; EP/R042802/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 May 2022 08:52 |
Last Modified: | 25 May 2022 08:52 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/chem.202103014 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:187327 |