Poly(4-vinylpyridine) as ligand for Au(I) and Zn(II) cations: luminescent metal-containing polymers

摘要

The poly-dentate ligand poly(4-vinylpyridine) (P4VP, M-w approximate to 60,000gmol(-1)) reacts with (Me2S)AuCl or ZnCl2 yielding white polymers with empirical formula (PVP)(AuCl)(0.4) and (PVP)(ZnCl2)(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)-ZnCl2, 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 - interactions are present. The compound does not show photoluminescence. The solid-state structure of the disproportionation product (Etpy)AuCl3 has been determined as well.