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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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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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Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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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.
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Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Hydrated Proton-Conductive Metal-Organic Frameworks.

Masaaki Sadakiyo1,2, Teppei Yamada1, Hiroshi Kitagawa1,3

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Metal-organic frameworks (MOFs) show potential as proton conductors, offering high conductivity and visible pathways. This study introduces the design, synthesis, and properties of these hydrated proton-conductive MOFs.

Keywords:
acidityfuel cellsmetal-organic frameworksproton transportstructure-activity relationships

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Proton conduction is crucial for energy applications.
  • Metal-organic frameworks (MOFs) are emerging as novel materials for various applications.
  • Understanding proton transport in MOFs is an active area of research.

Purpose of the Study:

  • To introduce studies on the design and synthesis of MOFs for proton conduction.
  • To investigate the proton-conductive properties of hydrated MOFs.
  • To highlight MOFs as a new class of proton conductors.

Main Methods:

  • Design and synthesis of metal-organic frameworks (MOFs).
  • Incorporation of hydrated proton-conductive systems within MOFs.
  • Characterization of proton conductivity and structural properties.

Main Results:

  • Hydrated proton-conductive MOFs exhibit high proton conductivity (~10^-2 S/cm).
  • This conductivity is comparable to practical organic polymers.
  • High crystallinity of MOFs allows for structural visualization of proton-conducting pathways.

Conclusions:

  • Metal-organic frameworks (MOFs) are promising materials for proton conduction.
  • The design and synthesis of hydrated MOFs enable efficient proton transport.
  • MOFs offer advantages in conductivity and pathway visualization for proton conductor applications.