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Structural and Luminescent Properties of Homoleptic Silver(I), Gold(I), and Palladium(II) Complexes with NHC-NHC Heteroditopic Carbene Ligands. | LitMetric

AI Article Synopsis

  • Researchers synthesized novel silver(I), gold(I), and palladium(II) complexes using unique bidentate heteroditopic carbene ligands that link two types of carbene units through a propylene bridge.
  • The silver(I) and gold(I) complexes were dinuclear, featuring two bridging ligands, while the palladium(II) complex had both ligands attached to a single metal center, leading to the observation of different isomers.
  • X-ray diffraction and density functional theory (DFT) calculations were used to analyze the structures, revealing that the dinuclear gold(I) complexes showed blue phosphorescent emission, with their absorption characteristics linked to metal-to-ligand charge transfer.

Article Abstract

Novel silver(I), gold(I), and palladium(II) complexes were synthesized with bidentate heteroditopic carbene ligands that combine an imidazol-2-ylidene (NHC) with a 1,2,3-triazol-5-ylidene (NHC) connected by a propylene bridge. The silver(I) and gold(I) complexes were dinuclear species, [M(NHC-NHC)](PF) (M = Ag or Au), with the two bidentate ligands bridging the metal centers, whereas in the palladium(II) complex [Pd(NHC-NHC)](PF), the two ligands were chelated on the same metal center. Because of the presence of two different carbene units, isomers were observed for the gold(I) and palladium(II) complexes. The molecular structures of the head-to-tail isomer for gold(I) complexes, with a twisted or folded- conformation of the bridge between the carbene units, were determined by X-ray diffraction analysis. The study was completed with a systematic structural investigation through density functional theory (DFT) calculations. For palladium(II) species, the head-to-head form was structurally characterized. The dinuclear gold(I) complexes were emissive in the solid state in the blue region (PLQY up to 8%); time-dependent density functional theory (abbreviated as TD-DFT) calculations disclosed that the absorption bands have metal-to-ligand-charge-transfer character and evidenced that the emission occurs from the T level (phosphorescence).

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648577PMC
http://dx.doi.org/10.1021/acsomega.8b03668DOI Listing

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