In the trinuclear, heterometallic cluster compound [AuCuCl(P∩N)]PF metallophilic interactions give rise to very efficient cold-white light emission as a result of at least two thermally non-equilibrated emissive triplet states (one of mainly Cu → py and the other of Au → py character, respectively) with exceptional spin-orbit coupling and short emission lifetimes, which are competitive to Pt- and Ir-based emitters.
The poly-dentate ligand poly(4-vinylpyridine) (P4VP, M w ≈ 60,000 g mol −1) reacts with (Me 2 S)AuCl or ZnCl 2 yielding white polymers with empirical formula (PVP)(AuCl) 0.4 and (PVP)(ZnCl 2) 0.7. Upon excitation with UV light, both metal-containing materials feature luminescence. Emissions of (P4VP)-AuCl are based on aurophilic interactions whereas for (P4VP)-ZnCl 2 , an excitation wavelength-dependent luminescence could be observed. The latter behavior can be explained by the formation of aggregated species with different excitation energies. For comparison, the model compound (Etpy)AuCl (Etpy = 4-ethylpyridine) is prepared and structurally characterized. The solid-state structure reveals that no aurophilic or π-π interactions are present. The compound does not show photoluminescence. The solid-state structure of the disproportionation product (Etpy)AuCl 3 has been determined as well.
Zn(II) halide complexes of the form L2ZnX2 (X=Cl, Br, I) containing bio-relevant or bio-related ligands like 1-alkyl-imidazoles (alkyl=methyl, ethyl and iso-propyl) or (–)-nicotine are presented. All complexes were characterized by 1H NMR spectroscopy, mass spectrometry and elemental analysis. The molecular structures of the majority of complexes were determined by single crystal X-ray diffraction. The zinc ion exists in a tetrahedral environment coordinated by two halide anions and two nitrogen atoms of the N-heterocycles. Upon photoexcitation the nicotine complexes feature a blue emission which we tentatively assign to phosphorescence.
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