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Related Concept Videos

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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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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 Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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Reactivity of Metal Clusters.

Zhixun Luo1, A W Castleman2, Shiv N Khanna3

  • 1State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences , Beijing, 100190, China.

Chemical Reviews
|December 15, 2016
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Summary
This summary is machine-generated.

This study explores metal cluster reactivity with various molecules. Understanding these gas-phase reactions provides insights into condensed-phase chemistry and cluster stability.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Nanomaterials Chemistry

Background:

  • Metal clusters exhibit unique reactivity influenced by their size and electronic structure.
  • Gas-phase cluster reactions offer a controlled environment to study fundamental chemical processes.
  • Understanding cluster reactivity is crucial for applications in catalysis and materials science.

Purpose of the Study:

  • To review recent research advances in the reactivity of metal clusters.
  • To elucidate the mechanisms of elementary reactions involving metal clusters and various molecules.
  • To connect gas-phase cluster reactivity to condensed-phase phenomena and nanomaterial stability.

Main Methods:

  • Focus on gas-phase cluster reaction apparatuses.
  • Analysis of reactions with polar and nonpolar molecules.
  • Detailed examination of reaction mechanisms including adsorption, addition, and bond cleavage.

Main Results:

  • Metal cluster reactions proceed through step-by-step geometric and electronic reorganization.
  • Key mechanisms discussed include the harpoon mechanism and complementary active sites (CAS).
  • Reactivity is influenced by factors like chemical adsorption, etching, and spin effects.

Conclusions:

  • Gas-phase studies provide fundamental insights into metal cluster reactivity.
  • This understanding aids in dissecting the stability and reactivity of monolayer-protected clusters.
  • Research advances contribute to both fundamental chemistry and practical nanomaterial synthesis.