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Related Concept Videos

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.
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...
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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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...
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...

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CO2 selective dynamic two-dimensional Zn(II) coordination polymer.

In Hong Hwang1, Jeong Mi Bae, Yong-Kyung Hwang

  • 1Department of Fine Chemistry, Seoul National University of Science & Technology, Seoul 139-743, Republic of Korea. chealkim@snut.ac.kr.

Dalton Transactions (Cambridge, England : 2003)
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

A novel dynamic two-dimensional metal-organic framework (MOF) selectively adsorbs carbon dioxide (CO2) and acts as a reusable catalyst for transesterification reactions.

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Published on: November 21, 2017

Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable properties for gas adsorption and catalysis.
  • Dynamic MOFs can undergo structural changes, influencing their performance.
  • Selective CO2 capture is crucial for environmental applications.

Purpose of the Study:

  • To synthesize and characterize a new 2D MOF system.
  • To investigate the CO2 selective adsorption properties of the MOF.
  • To evaluate the MOF's catalytic activity in transesterification reactions.

Main Methods:

  • Synthesis of [Zn(glu)(μ-bpe)]·2H2O (MOF I).
  • Variable temperature Powder X-ray Diffraction (PXRD) for structural analysis.
  • Low-temperature gas sorption analysis (CO2, N2, H2, CH4).
  • Heterogeneous catalysis experiments for transesterification.

Main Results:

  • The synthesized MOF I exhibits a dynamic framework structure.
  • Solvent-free MOF I demonstrates selective CO2 adsorption over other gases.
  • Significant hysteresis in CO2 adsorption/desorption isotherms at 196 K indicates dynamic behavior.
  • MOF I efficiently catalyzes transesterification with recyclability.

Conclusions:

  • The dynamic 2D MOF system shows promise for selective CO2 capture.
  • The material's catalytic activity and reusability make it suitable for green chemistry applications.
  • Structural dynamics are key to the observed CO2 selectivity.