Aqueous Ln(III) Luminescence Agents Derived from a Tasty Precursor

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The synthesis, aqueous stability and photophysical properties are reported for a novel tetradentate ligand derived from maltol, a commonly used flavor enhancer. In aqueous solution, this chelate forms stable complexes with Ln(III) cations, and sensitized emission was observed from Eu(III), Yb(III), and Nd(III). A comparison with recently reported and structurally analogous ligands reveals a slightly higher basicity but lower complex stability with Eu(III) [pEu = 14.7 (1)]. A very poor metal centered quantum yield with Eu(III) was observed ({Phi}{sub tot} = 0.04%), which can be rationalized by the similar energy of the ligand triplet state and the Eu(III) {sup 5}D{sub ... continued below

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Jocher, C.J.; Moore, E.G.; Pierce, J.D. & Raymond, K.N. June 2, 2008.

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The synthesis, aqueous stability and photophysical properties are reported for a novel tetradentate ligand derived from maltol, a commonly used flavor enhancer. In aqueous solution, this chelate forms stable complexes with Ln(III) cations, and sensitized emission was observed from Eu(III), Yb(III), and Nd(III). A comparison with recently reported and structurally analogous ligands reveals a slightly higher basicity but lower complex stability with Eu(III) [pEu = 14.7 (1)]. A very poor metal centered quantum yield with Eu(III) was observed ({Phi}{sub tot} = 0.04%), which can be rationalized by the similar energy of the ligand triplet state and the Eu(III) {sup 5}D{sub 0} emissive level. Instead, sensitized emission from the Yb(III) and Nd(III) cations was observed, which emit in the Near Infra-Red (NIR).

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  • Journal Name: Inorganic Chemistry

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  • Report No.: LBNL-2208E
  • Grant Number: DE-AC02-05CH11231
  • Grant Number: HL69832
  • Office of Scientific & Technical Information Report Number: 965886
  • Archival Resource Key: ark:/67531/metadc931672

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  • June 2, 2008

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 2:17 p.m.

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Jocher, C.J.; Moore, E.G.; Pierce, J.D. & Raymond, K.N. Aqueous Ln(III) Luminescence Agents Derived from a Tasty Precursor, article, June 2, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc931672/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.