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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

19.1K
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.
19.1K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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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...
26.9K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.4K
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...
24.4K
Metallic Solids02:37

Metallic Solids

20.9K
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....
20.9K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

12.0K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
12.0K
Alkali Metals03:06

Alkali Metals

24.9K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.9K

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Related Experiment Video

Updated: Feb 11, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
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[Cu12L8] Coordination Cage-Based Metal-Organic Framework for Iodine Capture.

Jing Liao1,2, Zi-Meng Wang2, Zhi-Heng Zhou2

  • 1Jiangxi Province Key Laboratory of Functional Organic Polymers, East China University of Technology, Nanchang 330013, China.

Inorganic Chemistry
|February 9, 2026
PubMed
Summary

Researchers developed a novel cage-based metal-organic framework (MOF), IHEP-52, for efficient iodine capture. This material demonstrates high adsorption capacities for both iodine in solution and vapor, making it promising for iodine sequestration applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Electron-rich moieties and aromatic conjugated units enhance iodine adsorption.
  • Metal-organic frameworks (MOFs) offer tunable structures for gas capture.

Purpose of the Study:

  • To construct a novel cage-based MOF material for efficient iodine capture.
  • To investigate the iodine adsorption capacity and mechanism of the synthesized MOF.

Main Methods:

  • Synthesis of a triazine derivative poly(carboxylic acid) ligand (H6TMTTA) and Cu2+ metal nodes.
  • Construction of a cage-like MOF, IHEP-52, with a (4, 6)-connected soc net.
  • Quantitative adsorption studies using iodine in cyclohexane solution and iodine vapor.
  • Characterization using Raman spectra and X-ray photoelectron spectroscopy (XPS).

Main Results:

  • IHEP-52 exhibits a cage-like structure [Cu12L8] with dynamic nanochannels.
  • Maximum iodine adsorption capacities of 366.4 mg·g-1 (solution) and 1763.9 mg·g-1 (vapor) were achieved.
  • Rapid equilibration within 6 h at 393 K for iodine vapor adsorption.
  • Framework-mediated disproportionation of adsorbed iodine to form I3- and I5- anions.

Conclusions:

  • IHEP-52 demonstrates exceptional iodine capture capabilities under ambient conditions.
  • The dynamic nanochannel architecture facilitates rapid guest exchange.
  • The MOF effectively stabilizes adsorbed iodine species, indicating potential for iodine remediation.