© Mina De La O - Getty Images
10. May 2021
Paper by Daniel Eppel published

A paper by Daniel Eppel was published in the journal “Chemistry – A European Journal”

In the paper “An Environ­men­tally Friendly, Photo­chem­i­cal Access to [N^C^N]Au(III) Pincer Complexes by Oxida­tive Addition” Eppel et al. develop a very easy, photo­sen­si­tizer-free, LED-mediated oxida­tive addition of diazo­nium salts to DMSAu(l)CI for the synthe­sis of cationic [N^C^N]Au(III) complexes bearing tetra­flu­o­rob­o­rate as a counter anion.

Pincer ligands have many extra­or­di­nary features. The good control of the reactiv­ity at the metal center due to a fixed, prede­ter­mined ligand geome­try and their thermal stabil­ity, which results from the strong coordi­na­tion of the donor atoms to the metal center, enables a manifold of appli­ca­tions in homoge­nous catal­y­sis, especially for indus­try applications.

While neutral [C^N^C]gold(III) complexes are well studied, cationic [N^C^N] complexes have been inves­ti­gated much less. This type of gold complexes is still limited to only a few specific examples and either highly toxic organomercury(II) compounds as trans­met­al­la­tion reagents or mostly a twofold excess of a gold precur­sor limit the synthetic poten­tial of the used approaches.

The environ­men­tally friendly, mercury-free proto­col presented in the paper is the first easy synthe­sis of these types of pincer-complexes in moder­ate to excel­lent yield start­ing from a readily avail­able gold(I) precur­sor with nitro­gen as the only byprod­uct. In addition, the first arylated [N^C^N]Au(III) pincer-complex was synthe­sized by using this technology.

Congrat­u­la­tions to Daniel Eppel!