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Related Concept Videos

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...
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...
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.
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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...
Metallic Solids02:37

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Published on: May 12, 2023

Polyporous metal-coordination frameworks.

Jeremiah J Gassensmith1, Ronald A Smaldone, Ross S Forgan

  • 1Center for the Chemistry of Integrated Systems, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Organic Letters
|March 2, 2012
PubMed
Summary
This summary is machine-generated.

Researchers created a novel "green" porous coordination polymer using α-cyclodextrin and rubidium salts. This material features chiral helical channels with potential for enantioselective separation applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Green Chemistry

Background:

  • Chiral separation is crucial in pharmaceuticals and chemical synthesis.
  • Porous coordination polymers offer tunable structures for various applications.
  • Developing sustainable and efficient separation materials is a key challenge.

Purpose of the Study:

  • To synthesize a novel "green" porous coordination polymer from readily available chiral building blocks.
  • To investigate the structural characteristics of the resulting material.
  • To evaluate its potential for chiral separation applications.

Main Methods:

  • Crystallization of a complex using α-cyclodextrin and rubidium salts.
  • Characterization of the porous coordination polymer structure.
  • Theoretical analysis of the material's chiral separation capabilities.

Main Results:

  • Successful crystallization of a "green" porous coordination polymer.
  • Formation of infinitely long, left-handed helical channels formed by cyclodextrin and rubidium ions.
  • Demonstration of the material's potential as a medium for chiral separation.

Conclusions:

  • A novel, sustainable porous coordination polymer with unique helical channels has been synthesized.
  • The material exhibits promising characteristics for enantioselective separations.
  • This work opens avenues for designing advanced chiral separation media.