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Metal-Ligand Bonds02:51

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Efficient NIR Emission from Nd, Er, and Tm Complexes with Fluorinated Selenolate Ligands.

Wen Wu1, Xin Zhang1, Anna Y Kornienko1

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New lanthanide selenolate complexes, (DME)2Ln(SeC6F5)3, were synthesized. These compounds exhibit bright near-infrared (NIR) emission, showing potential for optical applications.

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Area of Science:

  • Organometallic Chemistry
  • Lanthanide Chemistry
  • Materials Science

Background:

  • Lanthanide complexes are crucial for various optical and magnetic applications.
  • Developing novel lanthanide compounds with tailored properties is an active area of research.
  • Selenolate ligands offer unique coordination environments and electronic properties.

Purpose of the Study:

  • To synthesize and characterize novel lanthanide selenolate complexes.
  • To investigate the structural and photophysical properties of these new compounds.
  • To explore their potential as near-infrared (NIR) emitting materials.

Main Methods:

  • Reductive cleavage of the diselenide (SeC6F5)2 using elemental lanthanides (Ln = Nd, Er, Tm) in dimethoxyethane (DME).
  • Isolation and purification of the resulting complexes: (DME)2Ln(SeC6F5)3.
  • Single-crystal X-ray diffraction to determine the solid-state structure.
  • Photoluminescence spectroscopy to measure NIR emission properties.

Main Results:

  • High-yield synthesis of three isostructural lanthanide selenolate complexes: (DME)2Ln(SeC6F5)3 (Ln = Nd, Er, Tm).
  • The lanthanide ions are eight-coordinate, bound to DME oxygen atoms and terminal selenolate ligands.
  • A unique dative bond interaction was observed between an arene fluoride and an ortho-fluorine on a selenolate ligand.
  • All synthesized compounds demonstrated bright NIR emission.

Conclusions:

  • The study successfully synthesized novel lanthanide selenolate complexes with interesting structural features.
  • These complexes exhibit strong NIR emission, highlighting their potential for applications in optical devices.
  • The observed dative bonding provides insights into ligand-metal interactions in these systems.