Abstract
The first examples of pyrazine-based gold(III) pincer complexes are reported; their intense photoemissions can be modified by protonation, N-alkylation or metal ions, without the need for altering the ligand framework. Emissions shift from red (77 K) to blue (298 K) due to thermally activated delayed fluorescence (TADF).
Highlights
The first examples of pyrazine-based gold(III) pincer complexes are reported; their intense photoemissions can be modified by protonation, N-alkylation or metal ions, without the need for altering the ligand framework
The ligand scaffold based on 2,6-diphenylpyridine[1] has proved useful in gold(III) chemistry and forms (C^N^C)AuX pincer complexes of type A (Chart 1). Such complexes have proved to be highly versatile and, in combination with strong carbon-based s-donor ligands (e.g. X = N-heterocyclic carbene, alkynyl), display interesting photophysical[2,3,4] properties. This C^Npy^C ligand system has been successful in stabilizing types of compounds that have frequently been invoked as unstable intermediates in catalytic cycles or postulated in computer modelling of catalytic processes, such as gold(III) hydrido, alkene, CO and peroxo complexes.[5]
By contrast, related gold(III) complexes have until now been inaccessible since the usual methods employed for the synthesis of pyridine complexes A fail for the analogous pyrazine derivatives
Summary
The first examples of pyrazine-based gold(III) pincer complexes are reported; their intense photoemissions can be modified by protonation, N-alkylation or metal ions, without the need for altering the ligand framework. The ligand scaffold based on 2,6-diphenylpyridine[1] has proved useful in gold(III) chemistry and forms (C^N^C)AuX pincer complexes of type A (Chart 1).
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