Tridentate Benzimidazole-Pyridine-Tetrazolates as Sensitizers of Europium Luminescence

Abstract : We report on new anionic tridentate benzimidazole-pyridine-tetrazolate ligands that form neutral 3:1 complexes with trivalent lanthanides. The ligands are UV-absorbing chromophores that sensitize the red luminescence of europium with energy-transfer efficiency of 74-100%. The lifetime and quantum yield of the sensitized europium luminescence increase from 0.5 ms and 12-13% for the as-prepared solids to 2.8 ms and 41% for dichloromethane solution. From analysis of the data, the as-prepared solids can be described as aqua-complexes [Ln(κ(3)-ligand)2(κ(1)-ligand)(H2O)x] where the coordinated water molecules are responsible for the strong quenching of the europium luminescence. In solution, the coordinated water molecules are replaced by the nitrogen atoms of the κ(1)-ligand to give anhydrous complexes [Ln(κ(3)-ligand)3] that exhibit efficient europium luminescence. X-ray structures of the anhydrous complexes confirm that the lanthanide ion (La(III), Eu(III)) is nine-coordinate in a distorted tricapped trigonal prismatic environment and that coordination of the lanthanide ion by tetrazolate is weaker than by carboxylate.
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https://hal.archives-ouvertes.fr/hal-02103328
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Submitted on : Thursday, April 18, 2019 - 11:54:43 AM
Last modification on : Thursday, April 18, 2019 - 1:43:50 PM

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Nail Shavaleev, Svetlana Eliseeva, Rosario Scopelliti, Jean-Claude Bunzli. Tridentate Benzimidazole-Pyridine-Tetrazolates as Sensitizers of Europium Luminescence. Inorganic Chemistry, American Chemical Society, 2014, 53 (10), pp.5171-5178. ⟨10.1021/ic500267b⟩. ⟨hal-02103328⟩

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