Synthesis of Ru(<scp>ii</scp>) and Os(<scp>ii</scp>) photosensitizers bearing one 9,10-diamino-1,4,5,8-tetraazaphenanthrene scaffold

De Kreijger, Simon; Cauët, Emilie; Elias, Benjamin; Troian-Gautier, Ludovic

doi:10.1039/d4dt01077a

Dalton Trans.

2024

DOI: 10.1039/d4dt01077a

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Synthesis of Ru(ii) and Os(ii) photosensitizers bearing one 9,10-diamino-1,4,5,8-tetraazaphenanthrene scaffold

Simon De Kreijger,

Emilie Cauët,

Benjamin Elias

et al.

Abstract: The synthesis of eight 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...

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A Compendium of Methodically Determined Ground‐ and Excited‐State Properties of Homoleptic Ruthenium(II) and Osmium(II) Photosensitizers

Glaser,

De Kreijger,

Achilleos

et al. 2024

ChemPhotoChem

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The one‐pot synthesis of a total of 32 ruthenium(II) and osmium(II) photosensitizers bearing substituted 2,2’‐bipyridines, 1,10‐phenanthrolines, and diaza ligands is reported. Whereas most of these photosensitizers were already reported in the literature, the present study offers extensive datasets of ground‐ and excited‐state properties highly desirable for future development in e.g., machine learning, artificial intelligence, and photoredox catalysis. All photosensitizers absorbed light intensely in the visible part of the spectrum, with the Os(II) photosensitizers absorbing further into the red part. Excited‐state lifetimes and photoluminescence quantum yields were generally larger for Ru(II) photosensitizers than for Os(II) analogs, which agrees with the energy gap law. The excited‐state redox potentials were determined for all investigated photosensitizers covering a range of –0.21 to –1.35 V vs SCE for excited‐state oxidation and 0.14 to 1.48 V vs SCE for excited‐state reduction. A procedure for counter‐ion exchange to generate the corresponding PF6–, Cl–, BF4–, NO3–, OTf–, ClO4–, and BArF– is reported for six photosensitizers. The synthetic ease, detailed report of fundamental photophysical properties, and a broad range of excited‐state redox potentials open opportunities for systematic investigations in several applications and further streamline developments in photoredox catalysis.

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A Compendium of Methodically Determined Ground‐ and Excited‐State Properties of Homoleptic Ruthenium(II) and Osmium(II) Photosensitizers

Glaser,

De Kreijger,

Achilleos

et al. 2024

ChemPhotoChem

View full text Add to dashboard Cite

show abstract

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Synthesis of Ru(ii) and Os(ii) photosensitizers bearing one 9,10-diamino-1,4,5,8-tetraazaphenanthrene scaffold

Abstract: The synthesis of eight 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...

Cited by 1 publication

References 103 publications

A Compendium of Methodically Determined Ground‐ and Excited‐State Properties of Homoleptic Ruthenium(II) and Osmium(II) Photosensitizers

A Compendium of Methodically Determined Ground‐ and Excited‐State Properties of Homoleptic Ruthenium(II) and Osmium(II) Photosensitizers

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