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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
Ligand Binding Sites02:40

Ligand Binding Sites

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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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Connecting single-ion magnets through ligand dimerisation.

Po-Heng Lin1, Ilia Korobkov, Tara J Burchell

  • 1Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON K1N 6N5, Canada.

Dalton Transactions (Cambridge, England : 2003)
|August 18, 2012
PubMed
Summary
This summary is machine-generated.

Two new dysprosium(III) complexes were synthesized and characterized. Both complexes exhibit single-ion magnet behavior, with complex 2 showing frequency-dependent signals even without a DC field.

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

Area of Science:

  • Coordination Chemistry
  • Magnetochemistry
  • Materials Science

Background:

  • Schiff base ligands are versatile building blocks in coordination chemistry.
  • Dysprosium(III) complexes are of interest for their magnetic properties, particularly for potential applications in data storage and quantum computing.
  • Single-ion magnet behavior in lanthanide complexes is a key area of research for developing molecular magnetic materials.

Purpose of the Study:

  • To synthesize and characterize novel mononuclear and dinuclear dysprosium(III) complexes using a polytopic Schiff base ligand.
  • To investigate the magnetic properties, including direct current (dc) and alternating current (ac) magnetic susceptibility, of the synthesized complexes.
  • To evaluate the potential of these complexes as single-ion magnets (SIMs) by determining their relaxation barriers.

Main Methods:

  • Synthesis of mononuclear [Dy(hmb)(NO(3))(2)(DMF)(2)] (1) and dinuclear [Dy(2)(hmt)(NO(3))(4)(DMF)(4)]·DMF (2) complexes.
  • Single-crystal X-ray diffraction analysis to determine the molecular structure and coordination geometry of the Dy(III) ions.
  • Direct current (dc) and alternating current (ac) magnetic susceptibility measurements to study magnetic behavior and identify Single-Ion Magnet properties.

Main Results:

  • The crystal structure revealed a distorted pentagonal interpenetrating tetrahedral arrangement around the Dy(III) ion.
  • Complex 2, featuring two well-isolated Dy(III) ions, exhibited frequency-dependent ac signals under zero dc field.
  • Both complexes displayed frequency-dependent signals under an optimal dc field, confirming Single-Ion Magnet behavior with effective energy barriers (U(eff)) of 34 K for complex 1 and 42 K for complex 2.

Conclusions:

  • The synthesized dysprosium(III) complexes demonstrate Single-Ion Magnet behavior.
  • The dinuclear complex shows promising properties for potential applications in molecular magnetism.
  • The study highlights the role of ligand design in tuning the magnetic properties of lanthanide complexes.