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Related Concept Videos

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...
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.
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
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.

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Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
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Dibromido(6-methyl-2,2'-bipyridine-κ(2) N,N')cobalt(II).

Sadif A Shirvan1, Sara Haydari Dezfuli, Fereydoon Khazali

  • 1Department of Chemistry, Omidieh Branch, Islamic Azad University, Omidieh, Iran.

Acta Crystallographica. Section E, Structure Reports Online
|March 8, 2013
PubMed
Summary

This study details the crystal structure of a cobalt(II) compound, [CoBr2(C11H10N2)], highlighting its distorted tetrahedral geometry and intermolecular interactions. The findings reveal insights into coordination chemistry and crystal packing of metal-organic complexes.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Coordination Chemistry

Background:

  • Bipyridine ligands are crucial in coordination chemistry due to their chelating ability.
  • Cobalt(II) complexes exhibit diverse geometries and magnetic properties.
  • Understanding crystal packing is essential for predicting material properties.

Purpose of the Study:

  • To characterize the molecular and crystal structure of the title compound, [CoBr2(C11H10N2)].
  • To investigate the coordination environment around the cobalt(II) center.
  • To analyze the intermolecular interactions governing the crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular structure.
  • The coordination geometry was analyzed based on bond lengths, angles, and symmetry.
  • Intermolecular interactions, including π-π stacking and C-H⋯Br hydrogen bonds, were identified and quantified.

Main Results:

  • The cobalt(II) atom is four-coordinated in a distorted tetrahedral geometry.
  • The coordination sphere consists of two nitrogen atoms from a 6-methyl-2,2'-bipyridine ligand and two terminal bromine atoms.
  • The crystal structure is stabilized by π-π stacking interactions between pyridine rings and C-H⋯Br hydrogen bonds, forming a three-dimensional network.

Conclusions:

  • The study successfully elucidated the structure of the [CoBr2(C11H10N2)] complex.
  • The distorted tetrahedral geometry and observed intermolecular interactions provide a basis for understanding its solid-state behavior.
  • This work contributes to the understanding of cobalt coordination complexes with bipyridine ligands.