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Synthesis, crystal structure and luminescence of three europium complexes with 2-iodobenzoic acid

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Three new complexes, [Eu(2-IBA)3 · H2O]n (1), [Eu(2-IBA)3 · 2,2'-bpy]2 (2), and [Eu(2-IBA)3 ·phen]2 (3) (2-IBA = 2-iodobenzoato; 2,2'-bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline) were synthesized, and their crystal structures determined by X-ray diffraction. In complex 1, Eu3+ ions are linked through carboxylate groups via bridging - chelating - bridging coordination modes to form a one-dimensional polymeric chain. The carboxylate groups are tetradentate-bridged. Complex 2 is binuclear with an inversion center, in which europium is nine-coordinated with seven oxygen atoms from five 2-IBA ligands and two nitrogen atoms from one 2,2'-bpy molecule in a distorted monocapped square antiprism. The crystal structure of 3 is similar to that of 2. These complexes emit red light luminescence. The 5D0 → 7Fj (j = 1-4) transition emission of Eu3+ ion has been observed.
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Keywords: 2-Iodobenzoic acid; Europium complexes; Luminescence; Structure; Synthesis

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Capital Normal University, Beijing 100037, People's Republic of China 2: Department of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China

Publication date: July 1, 2007

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