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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
19.3K
Colors and Magnetism03:02

Colors and Magnetism

12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

21.1K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Hydroxide-free cubane-shaped tetranuclear [Ln4] complexes.

Sourav Das1, Atanu Dey, Sourav Biswas

  • 1Department of Chemistry, Indian Institute of Technology Kanpur , Kanpur-208016, India.

Inorganic Chemistry
|March 29, 2014
PubMed
Summary
This summary is machine-generated.

New tetranuclear lanthanide coordination compounds were synthesized using a novel Schiff-base ligand. Complex 3, containing dysprosium, exhibits single-molecule magnet behavior with two relaxation steps, indicating potential for advanced magnetic applications.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • Lanthanide complexes are of interest for their unique magnetic properties.
  • Schiff-base ligands offer versatile coordination environments for metal ions.
  • Developing new molecular materials with single-molecule magnet (SMM) behavior is crucial for future technologies.

Purpose of the Study:

  • To synthesize and characterize novel tetranuclear lanthanide coordination compounds.
  • To investigate the structural and magnetic properties of these new complexes.
  • To explore the potential single-molecule magnet behavior of the dysprosium complex.

Main Methods:

  • Synthesis of lanthanide(III) chloride salts (Gd, Tb, Dy) with a Schiff-base ligand (LH2) and pivalic acid (PivH).
  • X-ray diffraction studies to determine the molecular structure and core geometry.
  • Alternating current (ac) susceptibility measurements to analyze magnetic relaxation dynamics.

Main Results:

  • Four tetranuclear lanthanide coordination compounds, [Ln4(L)4(μ2-η(1)η(1)Piv)4]·xH2O·yCH3OH, were successfully synthesized.
  • X-ray diffraction revealed a distorted cubane-like [Ln4(μ3-OR)4](+8) core with eight-coordinated lanthanide ions.
  • Complex 3 (Dy(III)) displayed frequency- and temperature-dependent two-step out-of-phase ac susceptibility signals, indicative of SMM behavior.

Conclusions:

  • The new Schiff-base ligand facilitates the formation of tetranuclear lanthanide clusters with a unique cubane core.
  • The dysprosium complex exhibits single-molecule magnet properties, with identified anisotropic barriers and pre-exponential factors for relaxation processes.
  • These findings contribute to the design of novel lanthanide-based molecular magnets.