Abstract
The covalent combination of a cyanine dye (IR-783) with a tetraphenyl porphyrin unit through an ether linkage results in a photoactive system capable of producing singlet oxygen. The synthesis, characterization and photophysical properties of the resulting novel free base porphyrin–cyanine conjugate named TPPO-IR-783 (TOI) is reported. Excited state properties were studied in various solvents with differing polarity. The fluorescence is strongly solvent dependent, however this is not the case for singlet oxygen phosphorescence, which is only observed in tetrahydrofuran (THF), when comparing 8 different polar, non-polar and medium-polarity solvents. This novel type of porphyrin–cyanine photosensitizer has the ability to produce singlet oxygen and absorbs light at NIR wavelengths.
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All available data belonging to this research can be found in this RDM repository: https://doi.org/10.21942/uva.22219864.v1
Abbreviations
- A3B porphyrin:
-
Denotation of the substitution pattern of the meso-substituents on the porphyrin: 3 “A” substituents and 1 “B” substituent. In TPPOH (Fig. 3), A = phenyl group and B = 4-hydroxyphenyl group
- A.U.:
-
Arbitrary units
- DMF:
-
N, N-dimethylformamide
- DMSO:
-
Dimethyl sulfoxide
- ET:
-
Electron transfer
- EtOH:
-
Ethanol
- fs-TA:
-
Femtosecond transient absorption
- IR:
-
Infrared
- MeOH:
-
Methanol
- ns-TA:
-
Nanosecond transient absorption
- NIR:
-
Near-infrared
- PBS:
-
Phosphate buffered saline
- PS:
-
Photosensitizer
- SOCT-ISC:
-
Spin–orbit charge transfer intersystem crossing
- THF:
-
Tetrahydrofuran
- TPP:
-
5,10,15,20-Tetraphenylporphyrin
- TPPOH:
-
5-(4-Hydroxyphenyl)-10,15,20-triphenylporphyrin
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Acknowledgements
This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 764837. We thank the Erasmus+ exchange program for supporting JPM. We thank Prof. Patrick Trouillas (Limoges) for the design of the Table of Contents picture. We thank Sarah Egan-Fraser for her contribution to this research, as summarized in the note above.
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Topical Collection in honor of Prof. Dr. A. M. (Fred) Brouwer and his contributions to science.
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Gibbons, D.J., Berbiguier, Y., Mulvaney, J.P. et al. Free base porphyrin–cyanine dye conjugate: synthesis and optical properties. Photochem Photobiol Sci 23, 163–176 (2024). https://doi.org/10.1007/s43630-023-00510-5
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DOI: https://doi.org/10.1007/s43630-023-00510-5