Synthesis of Ru(II) and Os(II) Photosensitizers Bearing one 9,10-diamino-1,4,5,8-tetraazaphenanthrene Scaffold
(2024) Dalton Transactions — Vol. 53, p. 10270-10284 (2024)
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- The synthesis of eight novel Ru(II) and Os(II) photosensitizers bearing a common 9,10-disubstituted-1,4,5,8-tetraazaphenanthrene backbone is reported. With Os(II) photosensitizers, the 9,10-diNH2-1,4,5,8-tetraazaphenanthrene could be directly chelated onto the metal center via the heteroaromatic moiety, whereas similar conditions using Ru(II) resulted in the formation of an o-quinonediimine derivative. Hence, an alternative route, proceeding via the chelation of 9-NH2-10-NO2-1,4,5,8-tetraazaphenanthrene and subsequent ligand reduction of the corresponding photosensitizers was developed. Photosensitizers chelated via the polypyridyl-type moiety exhibited classical photophysical properties whereas the o-quinonediimine chelated Ru(II) analogues exhibited red-shifted absorption (520 nm) and no photoluminescence at room temperature in acetonitrile. The most promising photosensitizers were investigated for excited-state quenching with guanosine-5’-monophosphate in aqueous buffered conditions where reductive excited-state electron transfer was observed by nanosecond transient absorption spectroscopy.
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De Kreijger, S., Cauët, E., Elias, B., & Troian-Gautier, L. (2024). Synthesis of Ru(II) and Os(II) Photosensitizers Bearing one 9,10-diamino-1,4,5,8-tetraazaphenanthrene Scaffold. Dalton Transactions, 53, 10270-10284. https://doi.org/10.1039/d4dt01077a (Original work published 2024)