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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
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...
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Properties of Organometallic Compounds01:23

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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.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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Metallic Solids02:37

Metallic Solids

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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....
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Valence Bond Theory02:42

Valence Bond Theory

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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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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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A bi-polyoxometallate-based host-guest metal-organic framework.

Sa-Sa Wang1, Wen-Bin Yang, Mingxue Yang

  • 1CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China. czlu@fjirsm.ac.cn.

Chemical Communications (Cambridge, England)
|February 1, 2020
PubMed
Summary

Researchers developed a novel bi-polyoxometalate (POM)-based metal-organic framework (MOF). This stable material, featuring unique host-guest structures, shows potential for fresh water harvesting from air.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Anionic polyoxometalates (POMs) exhibit a strong preference for bonding with positive metal cations.
  • Synthesizing POM-based metal-organic frameworks (MOFs), especially bi-POM structures with host-guest properties, presents significant challenges due to ligand interactions.

Purpose of the Study:

  • To synthesize an unprecedented bi-POM-based host-guest MOF.
  • To investigate the structural characteristics and chemical stability of the novel MOF.
  • To explore potential applications of the synthesized MOF, such as fresh water harvesting.

Main Methods:

  • Utilized a synthesis strategy to construct a complex bi-POM-based MOF structure.
  • Characterized the MOF's framework using [PW9O34] nodes and Keggin-type [PNiW11O40] guest units.
  • Assessed the chemical stability of the MOF across a wide pH range (2-12) and temperatures.

Main Results:

  • Successfully synthesized a novel bi-POM-based host-guest MOF: Na[Ni(enMe)2]4[Ni(enMe)2(H2O)2]2{[Ni6(μ3-OH)3(enMe)3 (SIP)1.5(B-α-PW9O34)]2[H3PNiW11O40]}·5enMe·33H2O (1).
  • The MOF demonstrated excellent chemical stability in aqueous solutions from pH 2 to 12, even at boiling temperatures.
  • The structure features Ni6-capped [PW9O34] as the host framework node and Keggin-type [PNiW11O40] as the guest.

Conclusions:

  • The successful synthesis of this complex bi-POM MOF overcomes previous limitations in POM-based material design.
  • The exceptional chemical stability indicates the material's robustness for practical applications.
  • The MOF holds promise for applications in sustainable technologies, including fresh water harvesting from air.