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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,...
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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Synthesis of Square Planar Cu4 Clusters.

Manasseh Kusi Osei1,2, Saber Mirzaei2, Xiaowei Bogetti2

  • 1Department of Chemistry, Rice University, 6100 Main St., Houston, TX 77005, USA.

Angewandte Chemie (International Ed. in English)
|August 23, 2022
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Summary

Researchers developed a new tetraamine scaffold to synthesize C4-symmetric copper (Cu4) clusters. This novel approach enables the study of metal-metal interactions and electronic structures in polynuclear metal complexes.

Keywords:
Cuz MimicHole DelocalizationMetal-Metal InteractionSupramolecular LigandsTetranuclear Copper Cluster

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Synthesizing polynuclear metal clusters with defined topologies, particularly square planar [M4] structures, is synthetically challenging.
  • Template-assisted synthesis offers a promising route to control cluster formation and geometry.

Purpose of the Study:

  • To develop a novel synthetic strategy for creating C4-symmetric [M4] square planar clusters.
  • To investigate the electronic structure and metal-metal interactions within these novel copper clusters.
  • To establish a new platform for studying small molecule activation.

Main Methods:

  • Synthesis of a rigidified resorcin[4]arene-based tetraamine scaffold (R L(NH2)4).
  • Template-assisted formation of C4-symmetric copper clusters (R L(NH)4 Cu4).
  • Density Functional Theory (DFT) calculations to analyze electronic structure.
  • Variable temperature X-band continuous wave-electron paramagnetic resonance (CW-EPR) spectroscopy to probe the oxidized species.

Main Results:

  • Successfully synthesized C4-symmetric R L(NH)4 Cu4 clusters with short Cu-Cu distances (approx. 2.7 Å), indicating direct metal-metal interactions.
  • DFT calculations revealed a delocalized electronic structure with significant electron density on copper centers within a narrow HOMO-3 to HOMO energy gap.
  • CW-EPR spectroscopy of the one-electron oxidized [Cu4]+ species showed a multiline spectrum, consistent with the proposed electronic structure.

Conclusions:

  • A novel and effective synthetic strategy for [M4] clusters using a tetraamine scaffold has been established.
  • The synthesized copper clusters exhibit direct metal-metal interactions and delocalized electronic properties.
  • This work provides a new platform for exploring the activation of small molecules by polynuclear metal complexes.