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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Valence Bond Theory

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Upconversion in molecular hetero-nonanuclear lanthanide complexes in solution.

Richard C Knighton1, Lohona K Soro, Alexandre Lecointre

  • 1Equipe de synthèse pour l'analyse (SynPA), Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178, CNRS/Université de Strasbourg, ECPM, 25 rue Becquerel, Strasbourg cedex 67087, France. l.charbonn@unistra.fr.

Chemical Communications (Cambridge, England)
|December 17, 2020
PubMed
Summary

New nonanuclear lanthanide complexes demonstrate highly efficient solution-state upconversion (UC). These molecules, featuring terbium and ytterbium, achieve unprecedented UC efficiency, outperforming existing systems significantly.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Upconversion (UC) is a process where low-energy photons are converted into higher-energy photons.
  • Lanthanide complexes are known for their luminescent properties, but solution-state efficiency has been a challenge.
  • Developing efficient molecular systems for upconversion is crucial for applications in sensing, imaging, and energy.

Purpose of the Study:

  • To introduce a novel class of nonanuclear lanthanide complexes for solution-state upconversion.
  • To investigate the upconversion efficiency of these complexes under near-infrared (NIR) excitation.
  • To compare the performance of these new molecular systems against existing upconversion technologies.

Main Methods:

  • Synthesis and characterization of nonanuclear lanthanide complexes containing terbium (Tb) and ytterbium (Yb).
  • Spectroscopic analysis to study luminescence properties upon 980 nm NIR excitation.
  • Quantification of upconversion efficiency under varying power densities and concentrations.

Main Results:

  • Nonanuclear lanthanide complexes exhibit efficient solution-state upconversion.
  • A specific composition (one Tb per eight Yb) showed remarkable Tb luminescence in the visible region.
  • An unprecedented upconversion efficiency of 1.0 × 10⁻⁷ was achieved at 2.86 W cm⁻², which is up to 26 times higher than current molecular systems.
  • Upconversion was observable down to a concentration of 10 nM.

Conclusions:

  • Nonanuclear lanthanide complexes represent a new, highly efficient class of solution-state upconversion molecules.
  • These findings pave the way for advanced applications utilizing efficient molecular upconversion systems.
  • The demonstrated efficiency and low concentration observation highlight the potential of these complexes in various fields.