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Published on: October 24, 2017
2-(2'-Hydroxyphenyl)benzimidazole and 9,10-phenanthroimidazole chelates and borate complexes: solution- and
Karima Benelhadj1, Julien Massue, Pascal Retailleau
1Laboratoire de Chimie Organique et Spectroscopies Avancées (ICPEES-LCOSA), UMR7515 CNRS, École de Chimie, Polymères, Matériaux de Strasbourg (ECPM), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France, and Laboratoire de Crystallochimie, ICSN - CNRS , Bât. 27-1 avenue de la Terrasse, 91198 Gif-sur-Yvette, Cedex, France.
Abstract:
The synthesis, structural, and optical properties of a series of luminescent N-alkylated 2-(2'-hydroxyphenyl)benzimidazole (HBI) or N-arylated 9,10-phenanthroimidazole (HPI) borate complexes are described. The optical properties of these complexes as well as their corresponding ligands were evaluated in solution and the solid state. Efficient emission in the blue-green region was obtained with quantum yields up to 91% in CH2Cl2 and 27% in the solid state. These emissions originate from excited state intramolecular proton transfer (ESIPT) for the ligands and from a singlet excited state for the borate complexes.
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