Synthesis and Photophysical Properties of T-Shaped Coinage-Metal Complexes

Chemistry. 2020 Jun 2;26(31):6993-6998. doi: 10.1002/chem.202000726. Epub 2020 May 15.

Abstract

The photophysical properties of a series of T-shaped coinage d10 metal complexes, supported by a bis(mesoionic carbene)carbazolide (CNC) pincer ligand, are explored. The series includes a rare new example of a tridentate T-shaped AgI complex. Post-complexation modification of the AuI complex provides access to a linear cationic AuI complex following ligand alkylation, or the first example of a cationic square planar AuIII -F complex from electrophilic attack on the metal centre. Emissions ranging from blue (CuI ) to orange (AgI ) are obtained, with variable contributions of thermally-dependent fluorescence and phosphorescence to the observed photoluminescence. Green emissions are observed for all three gold complexes (neutral T-shaped AuI , cationic linear AuI and square planar cationic AuIII ). The higher quantum yield and longer decay lifetime of the linear gold(I) complex are indicative of increased phosphorescence contribution.

Keywords: 1,2,3-triazol-5-ylidenes; T-shaped geometries; absorption and emission properties; coinage metals; pincer complexes.