self-assembly of a helical zinc-europium complex: speciation in aqueous solution and luminescence
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ID: 225430
2013
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Abstract
Two new tridentate(NNO)-bidentate(NN) compartmental ligands, HL5 and HL6, are synthesized from pyridine and benzimidazole synthons. They react in aqueous solution under physiological conditions with ZnII, LnIII, or a mixture thereof, to yield complexes of different stoichiometries, 1:3, 2:2, 2:3, 1:1:3, the speciation of which is established by UV-visible titrations and ESI mass spectrometry. Photophysical studies of the EuIII-containing solutions in Tris-HCl 0.1 M (pH = 7.4) show that lanthanide luminescence arises from a unique N6O3 coordination site with pseudo D3 symmetry. Relevant parameters such as crystal field splitting, lifetime, radiative lifetime and intrinsic quantum yield perfectly match those reported for dinuclear 4f-4f helicates in which the EuIII ion has the same coordination environment.
| Reference Key |
edeiters2013frontiersself-assembly
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|---|---|
| Authors | ;Emmanuel eDeiters;Svetlana Valerevna Eliseeva;Svetlana Valerevna Eliseeva;Jean-Claude Georges Bünzli;Jean-Claude Georges Bünzli |
| Journal | spatium |
| Year | 2013 |
| DOI |
10.3389/fchem.2013.00015
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| URL | |
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