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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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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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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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Structural Isomerism

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

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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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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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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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Isolation of a (dinitrogen)tricopper(I) complex.

Leslie J Murray1, Walter W Weare, Jason Shearer

  • 1Department of Chemistry, Center for Catalysis, University of Florida , Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|September 20, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a tricopper(I) complex featuring a bridging dinitrogen ligand. Spectroscopic and computational analyses revealed minimal metal-dinitrogen back-bonding, suggesting a unique electronic interaction.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • Tris(β-diketimine) cyclophanes are versatile ligands in coordination chemistry.
  • Dinitrogen (N2) ligands are challenging to synthesize and study due to their inertness.
  • Copper complexes with N2 ligands offer potential for catalytic applications.

Purpose of the Study:

  • To synthesize and characterize a novel tricopper(I) complex with a bridging dinitrogen ligand.
  • To investigate the electronic structure and bonding interactions between copper and the dinitrogen ligand.
  • To explore the nature of metal-dinitrogen back-bonding using computational methods.

Main Methods:

  • Synthesis of a tricopper(I) complex from a tris(β-diketimine) cyclophane precursor.
  • Characterization using Raman spectroscopy (rRaman) and nitrogen-15 Nuclear Magnetic Resonance ((15)N NMR) spectroscopy.
  • Density Functional Theory (DFT) calculations and Quantum Theory of Atoms in Molecules (QTAIM) analysis.

Main Results:

  • A tricopper(I) complex with a bridging dinitrogen ligand was successfully synthesized.
  • Spectroscopic data (rRaman νN-N = 1952 cm(-1), (15)N NMR δ = 303.8 ppm) confirmed the presence of the dinitrogen ligand.
  • DFT and QTAIM analyses indicated minimal metal-dinitrogen back-bonding, with limited contribution from N2(2pπ*) and Cu(3dπ)/Cu(3dσ) orbitals.

Conclusions:

  • The study reports the formation of a unique tricopper(I)-dinitrogen complex.
  • The electronic structure reveals weak metal-dinitrogen interactions, distinct from typical bonding scenarios.
  • The findings contribute to understanding the coordination chemistry of dinitrogen with transition metals.