Abstract
A series of three zwitterionic mixed-ligand bis(carbene) complexes of copper (1), silver (2) and gold (3) have been synthesized, based on a combination of ethyl-substituted cyclic (alkyl)(amino)carbene (Et2CAAC) and an anionic methyl-malonate-derived N-heterocyclic carbene (maloNHC). The crystal structures confirm the linear two-coordinate geometry without close intermolecular contacts. The compounds show blue-white phosphorescence consistent with a wide HOMO-LUMO energy gap (2.87–3.07 eV) estimated by cyclic voltammetry. The excited state lifetimes of crystalline powders decrease in the series Cu > Ag > Au, from 400 µs for copper 1 to 50 µs for the gold complex 3. DFT calculations indicate a large change in the transition dipole moment on excitation, of up to 16 D.
Original language | English |
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Pages (from-to) | 4234-4240 |
Number of pages | 7 |
Journal | European Journal of Inorganic Chemistry |
Volume | 2019 |
Issue number | 39-40 |
Early online date | 17 Jun 2019 |
DOIs | |
Publication status | Published - 31 Oct 2019 |
Profiles
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Manfred Bochmann
- School of Chemistry, Pharmacy and Pharmacology - Emeritus Professor
- Chemistry of Light and Energy - Member
- Chemistry of Materials and Catalysis - Member
Person: Honorary, Research Group Member