Binuclear Lanthanide(III) Complexes with Chiral Ligands: Dynamic Equilibria in Solution and Binding with Nucleotides Studied by Spectroscopic Methods
Language English Country Germany Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
- Keywords
- Raman optical activity, chiral ligands, circularly polarized luminescence, lanthanides, nucleotides,
- MeSH
- Adenosine analogs & derivatives chemistry MeSH
- X-Ray Diffraction MeSH
- Spectrometry, Mass, Electrospray Ionization MeSH
- Coordination Complexes chemistry MeSH
- Lanthanoid Series Elements chemistry MeSH
- Ligands MeSH
- Luminescent Measurements MeSH
- Spectrum Analysis, Raman MeSH
- Solutions MeSH
- Binding Sites MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Adenosine MeSH
- Coordination Complexes MeSH
- Lanthanoid Series Elements MeSH
- Ligands MeSH
- Solutions MeSH
Binuclear lanthanide complexes of Eu(III) and Sm(III) were obtained in the presence of chiral ligand 1,2-(R,R+S,S)-N,N'-bis(2-pyridylmethylene),2-diamine. An unusual structure of the Eu(III) compound with two lanthanide atoms connected through two chlorines was determined by X-ray crystallography. In solution, the dimer coexists with a monomeric complex, and the stability of the binuclear form depends on the solvent and concentration. The dimer-monomer equilibrium was monitored by circularly polarized luminescence (CPL) measured on a Raman optical activity (ROA) spectrometer, where both forms provided large CPL anisotropic ratios of up to 5.6×10-2 . Monomer formation was favored in water, whereas the dimer was stabilized in methanol. When mixed with adenosine phosphates, AMP gave much smaller CPL than ADP and ATP, indicating a high affinity of the Eu (III) complex for the phosphate group, which in connection with the ROA/CPL technique can be developed into a bioanalytical probe.
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Molecular Vibrations in Chiral Europium Complexes Revealed by Near-Infrared Raman Optical Activity
