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Related Concept Videos

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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 the dxy,...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Tri‑, Tetra‑, Octa-Nuclear Copper Complexes Including the First Mode Cubane-like {Cu4O3N} Core: Synthesis, Structure,

Cándida Pastor-Ramírez1, Sylvain Bernès2, Rafael Zamorano-Ulloa3

  • 1Benemérita Universidad Autónoma de Puebla, Instituto de Ciencias Químicas BUAP, Av. San Claudio y 24 sur S/N, Col San Manuel, C. P., 72570 Puebla, Puebla, Mexico.

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Summary

This study synthesized and characterized three copper(II) complexes with a Schiff base ligand and sodium azide. Magnetic and ESR studies revealed diverse spin exchange interactions, including ferromagnetic and antiferromagnetic coupling in the novel copper(II) complexes.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Schiff base ligands are versatile building blocks in coordination chemistry, enabling the formation of diverse metal complexes.
  • Copper(II) complexes are of significant interest due to their varied structural motifs and magnetic properties.
  • Azide ligands can bridge metal centers, influencing the magnetic exchange interactions within polynuclear complexes.

Purpose of the Study:

  • To synthesize and characterize novel copper(II) complexes using a Schiff base ligand and sodium azide.
  • To investigate the structural diversity, including cubane-type and polymeric structures, of the synthesized copper(II) complexes.
  • To explore the magnetic properties and spin exchange interactions (ferromagnetic and antiferromagnetic) within these copper(II) complexes.

Main Methods:

  • Synthesis of three copper(II) complexes: [Cu4(H2L)4(H2O)] 1, [Cu4(μ3-N3)(H2L)2(HL)(H2O)]2 2, and [Cu3(H2L)2(μ2-N3)2]n 3.
  • Single-crystal X-ray diffraction for detailed structural elucidation of the complexes.
  • Temperature-dependent magnetic susceptibility measurements (2.9–300 K) to probe magnetic interactions.
  • Electron Spin Resonance (ESR) spectroscopy at 300 K and 90 K to analyze electronic structure and magnetic behavior.

Main Results:

  • Structural characterization revealed a cubane-type core in complex 1, a double cubane structure in complex 2, and a polymeric structure in complex 3.
  • Magnetic studies indicated ferromagnetic and antiferromagnetic spin exchange interactions in complex 1, and predominantly antiferromagnetic coupling in complexes 2 and 3.
  • ESR spectra confirmed the Cu(II) oxidation state and provided insights into the magnetic exchange mechanisms, with complex 2 showing a forbidden half-field transition indicative of dimer interactions.

Conclusions:

  • The study successfully synthesized and characterized three novel copper(II) complexes with distinct structural architectures.
  • The interplay between ligand structure, bridging azide ligands, and copper-copper distances dictates the observed magnetic exchange interactions.
  • The findings contribute to the understanding of structure-property relationships in polynuclear copper(II) complexes.