Abstract
Mn(III) porphyrins display a unique UV–Vis spectrum: compared to the free-base and other metalloporphyrins, a strong red shift of the Soret-band and several extra bands can be observed in their spectra. To understand this behavior, we have recorded the UV–Vis spectra of differently substituted water-soluble Mn(III) porphyrins and conducted extensive theoretical investigations using time-dependent density functional theory. The calculated optical transitions, using the O3LYP functional, agree well with the measured absorption bands. According to the spectral interpretation, the Soret-band involves a mixture of L–L and ligand-to-metal charge transfer excitations, while the Q-bands and the higher-energy bands in the UV region correspond to pure LMCT as well as to ligand to metal-ligand mixed orbital excitations. The impact of the explicit and implicit water solvent on the spectral features is also discussed.
Funding source: Széchenyi 2020
Award Identifier / Grant number: GINOP-2.3.2-15-2016-00016 and VEKOP-2.3.1-16-2017-00013
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was supported by the Széchenyi 2020 under the GINOP-2.3.2-15-2016-00016 and VEKOP-2.3.1-16-2017-00013.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/zpch-2020-1787).
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Articles in the same Issue
- Frontmatter
- Original Papers
- Efficient adsorption of chlorpyrifos onto modified activated carbon by gamma irradiation; a plausible adsorption mechanism
- Characterization of the UV-Visible absorption spectra of manganese(III) porphyrins with time-dependent density functional theory calculations
- Extended visible light driven photocatalytic hydrogen generation by electron induction from g-C3N4 nanosheets to ZnO through the proper heterojunction
- The use of FCNT/PANI nanocomposites to extend the life of lithium-ion batteries
- Jellyfish-like few-layer graphene nanoflakes: high paramagnetic response alongside increased interlayer interaction
- Multi-functional organic–inorganic hydrogel microspheres as efficient catalytic system for reduction of toxic dyes in aqueous medium
- Aggregation behavior and thermodynamic properties of the mixture of sodium carboxymethyl cellulose and cetyltrimethylammonium bromide in numerous temperatures and mixed solvents
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