New insights into structure and luminescence of EuIII and SmIII complexes of the 3,4,3-LI(1,2-HOPO) ligand

Lena J. Daumann, David S. Tatum, Benjamin E.R. Snyder, Chengbao Ni, Ga Lai Law, Edward I. Solomon, Kenneth N. Raymond

Research output: Journal article publicationJournal articleAcademic researchpeer-review

49 Citations (Scopus)

Abstract

We report the preparation and new insight into photophysical properties of luminescent hydroxypyridonate complexes [MIIIL]- (M = Eu or Sm) of the versatile 3,4,3-LI(1,2-HOPO) ligand (L). We report the crystal structure of this ligand with EuIII as well as insights into the coordination behavior and geometry in solution by using magnetic circular dichroism. In addition TD-DFT calculations were used to examine the excited states of the two different chromophores present in the 3,4,3-LI(1,2-HOPO) ligand. We find that the EuIII and SmIII complexes of this ligand undergo a transformation after in situ preparation to yield complexes with higher quantum yield (QY) over time. It is proposed that the lower QY in the in situ complexes is not only due to water quenching but could also be due to a lower degree of f-orbital overlap (in a kinetic isomer) as indicated by magnetic circular dichroism measurements.
Original languageEnglish
Pages (from-to)2816-2819
Number of pages4
JournalJournal of the American Chemical Society
Volume137
Issue number8
DOIs
Publication statusPublished - 4 Mar 2015
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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