Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 31, Pages 6993-6998Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000726
Keywords
1; 2; 3-triazol-5-ylidenes; absorption and emission properties; coinage metals; pincer complexes; T-shaped geometries
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Funding
- National Research Foundation, South Africa [NRF 115642, NRF 94784, NRF 100119, NRF 111705]
- Sasol Technology R&D Pty. Ltd. (South Africa)
- Research Grants Council of Hong Kong Special Administrative Region, P.R. China [HKU 17301517]
- FEDER [CTQ2016-78205-P, CTQ2016-81797-REDC]
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The photophysical properties of a series of T-shaped coinage d(10) 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 Ag-I complex. Post-complexation modification of the Au-I complex provides access to a linear cationic Au-I complex following ligand alkylation, or the first example of a cationic square planar Au-III-F complex from electrophilic attack on the metal centre. Emissions ranging from blue (Cu-I) to orange (Ag-I) 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 Au-I, cationic linear Au-I and square planar cationic Au-III). The higher quantum yield and longer decay lifetime of the linear gold(I) complex are indicative of increased phosphorescence contribution.
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