Energy transfer (EnT) photocatalysis enabled by gold-N-heterocyclic carbene (NHC) complexes

Abstract

We present the use of gold sensitizers [Au(SIPr)(Cbz)] (PhotAu 1) and [Au(IPr)(Cbz)] (PhotAu 2) as attractive alternatives to state-of-the-art iridium-based systems. These novel photocatalysts are deployed in [2+2] cycloadditions of...

Blue‐to‐UVB Upconversion, Solvent Sensitization and Challenging Bond Activation Enabled by a Benzene‐Based Annihilator

“…For that, a deeper understanding of TTA[ 73 , 109 , 110 , 111 , 112 ] is required, and regarding sensitizer development, the upconversion community will strongly benefit from the recent progress in Dexter energy transfer catalysis. [ 49 , 113 , 114 , 115 , 116 ]…”

Novel dinuclear NHC–gold(i)-amido complexes and their application in energy transfer photocatalysis

“…5 c ,9 b , c These compounds have been successfully applied in organic synthesis 9 c and photocatalysis. 11 In addition, some of the CMA complexes have shown remarkable anticancer activity in several cell lines. 9 b , d To the best of our knowledge, all reported CMA complexes are mononuclear and dinuclear amido-bearing NHC complexes have not yet been described in the literature.…”

“…Having recently reported on the use of [Au(SIPr)(Cbz)]( PhotAucat 1 ) and [Au(IPr)(Cbz)] ( PhotAucat 2 ) as sensitizers in the [2 + 2] cycloaddition of diallyl ethers and N -tosylamides and having also shown that these gold–NHC complexes enabled the unprecedented photocatalytic intramolecular [2 + 2] cycloaddition of indoles, 5 c ,11 the structural similarities between these photocatalysts and the novel dinuclear [(bisNHC){Au(Cbz)} 2 ] complexes described here, we reasoned that two gold centers might also prove beneficial in EnT photocatalysis. 18,19 We next investigated the photocatalytic activity and photophysical properties of the new family of dinuclear bridging complexes to validate these suspicions.…”

“…aConversion was determined by GC using dodecane as internal standard and is the average of 2 reactions.bThe data were taken from our previous report. 11 …”

Carbazolophane Enhances the Efficiency of Thermally Activated Delayed Fluorescence in Carbene Coinage Metal Amides

“…Consequently, coinage metal carbenes have found myriad applications in catalysis, OLEDs, and stimulus-responsive materials. 1,3,[5][6][7][8][9][10][11][12][13] Linearly coordinated systems featuring a donor-M-acceptor (D-M-A) structure often display thermally activated delayed fluorescence (TADF), bypassing the spin-forbidden phosphorescence from the T1 state by endothermic reverse intersystem-crossing (rISC) and subsequent S1"S0 emission. [7][8][9][14][15][16][17][18][19][20] With this alternative luminescence mechanism relevant for efficient triplet exciton harvesting in device technologies, radiative rate constants kTADF of 10 5 -10 6 s -1 can be achieved that are competitive or even higher than obtained with traditional 4d/5d metal complexes that provide spin-orbit coupling (SOC) for phosphorescence.…”