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Related Concept Videos

Metal-Ligand Bonds02:51

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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.
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Color in Coordination Complexes
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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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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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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Metalloporphines: Dimers and Trimers.

Walter Jentzen1, John A Shelnutt2, W Robert Scheidt3

  • 1Fuel Science Department, Sandia National Laboratories , Albuquerque, New Mexico 87185-0710, United States.

Inorganic Chemistry
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers crystallized metalloporphines, revealing unusual trimeric structures in cobalt, copper, and zinc derivatives. These findings offer insights into metalloporphine self-assembly and solid-state packing.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Metalloporphines are fundamental porphyrin derivatives with diverse applications.
  • Understanding their solid-state structures is crucial for designing new materials.
  • Previous studies focused on tetraphenyl- and octaethylporphyrin derivatives.

Purpose of the Study:

  • To describe purification and crystallization methods for four-coordinate metalloporphines.
  • To analyze the crystal and molecular structures of metalloporphine derivatives.
  • To investigate self-assembly and packing in the solid state.

Main Methods:

  • Purification and crystallization of metalloporphine derivatives.
  • X-ray diffraction analysis of crystal structures.
  • Molecular structure determination and analysis of packing motifs.

Main Results:

  • Crystals of cobalt(II), copper(II), platinum(II), and zinc(II) metalloporphines were obtained.
  • Cobalt(II), copper(II), and zinc(II) derivatives form unusual trimeric species in the solid state.
  • Dimers and trimers were observed, with specific interplanar spacings and lateral shifts between porphine rings.

Conclusions:

  • Metalloporphines exhibit unique self-assembly into trimers in the solid state.
  • Structural analysis reveals specific packing arrangements and bonding characteristics.
  • Observed periodic trends in M-Np bond distances align with related porphyrin systems.