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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.1K
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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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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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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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...
9.1K

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Defined metal atom aggregates precisely incorporated into metal-organic frameworks.

Kathrin L Kollmannsberger1, Laura Kronthaler1, Joerg R Jinschek2

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This review explores the controlled synthesis of metal aggregates (MAs) within metal-organic frameworks (MOFs). It highlights strategies for creating atom-precise MA@MOF composites for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Nanosized metal aggregates (MAs), including metal nanoparticles (NPs) and nanoclusters (NCs), are crucial active species in various applications.
  • Stabilizing MAs within a matrix is essential to prevent agglomeration and maintain their activity.
  • Metal-organic frameworks (MOFs) offer a tunable, porous host for MAs due to their unique properties.

Purpose of the Study:

  • To review recent advances in the controlled synthesis of MA@MOF composites.
  • To focus on strategies yielding atom-precise MAs within MOFs.
  • To discuss the potential and limitations of these synthetic approaches.

Main Methods:

  • Overview of 'ship-in-bottle' and 'bottle-around-ship' synthetic strategies.
  • Exploration of methods for creating hierarchical MA@MOF structures.
  • Discussion of characterization techniques for analyzing MA@MOF materials.

Main Results:

  • Highlighting synthetic strategies for controlled MA loading in MOFs.
  • Identifying methods for achieving atom-precise metal aggregates.
  • Presenting characterization techniques for MA localization within MOF cavities.

Conclusions:

  • Controlled synthesis of MA@MOF composites is key for structure-property relationships.
  • MA@MOF materials have diverse applications beyond catalysis, including theranostics and biosensing.
  • Further research into atom-precise MAs within MOFs is needed.