N"N"C platinum (II) complexes based on phenyl-pyridin-2-ylpyrimidine ligands: synthesis, electrochemical and photophysical properties - Institut Brestois Santé Agro Matière Accéder directement au contenu
Article Dans Une Revue Dyes and Pigments Année : 2021

N"N"C platinum (II) complexes based on phenyl-pyridin-2-ylpyrimidine ligands: synthesis, electrochemical and photophysical properties

Résumé

A series of luminescent chloro- and alkynyl-platinum (II) complexes containing various tridentate cyclometalated ligands derived from phenyl-pyridin-2-ylpyrimidine and alkynyl ligands has been successfully synthesized and characterized. Their electrochemical, electronic absorption and luminescence properties have been experimentally investigated and supported by (Time-Dependent) Density Functional Theory ((TD)-DFT) calculations. Electrochemical studies show the presence of a ligand-centered reduction originating from the cyclometalating N"N"C ligands, as well as a major ligand-centered oxidation process (N"N"C or alkynyl) with minor contributions of the metal. Most of the complexes exhibits yellow-to-red luminescence at room-temperature in diluted solutions, in frozen matrices and in the solid state. Electron-withdrawing groups on the alkynyl-ligand induce a red shift of the emission band with increased quantum yield in solution. The emission is also sensitive to the position of the pyridyl fragment on the pyrimidine core: complexes with electron-poorer 4-pyridin-2-ylpyrimidine ligands exhibit red-shifted emission and decreased quantum yield compared to their 2-pyridin-4yl analogues. In solid state, chloro-platinum complexes without tBu bulky group exhibit red-shifted excimer emission.
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hal-03331329 , version 1 (15-05-2023)

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Mariia Hruzd, Sebastien Gauthier, Julien Boixel, Samia Kahlal, Nicolas Le Poul, et al.. N"N"C platinum (II) complexes based on phenyl-pyridin-2-ylpyrimidine ligands: synthesis, electrochemical and photophysical properties. Dyes and Pigments, 2021, 194, pp.109622. ⟨10.1016/j.dyepig.2021.109622⟩. ⟨hal-03331329⟩
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