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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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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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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...
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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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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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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Main-group metal cyclophane complexes with high coordination numbers.

Yasir Altaf1, Muhammad Yar2, Muhammad Ali Hashmi3

  • 1School of Chemical and Physical Sciences, Victoria University of Wellington New Zealand.

RSC Advances
|May 6, 2022
PubMed
Summary

Main-group metal cations form stable complexes with cyclophanes, preferring a central coordination mode. [2.2.2]paracyclophane complexes show greater thermodynamic stability than deltaphane analogues.

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Area of Science:

  • Computational Chemistry
  • Supramolecular Chemistry
  • Main-group Organometallic Chemistry

Background:

  • Cyclophanes are macrocyclic compounds known for their ability to encapsulate guest molecules.
  • Main-group metal cations are essential in various chemical processes and materials.

Purpose of the Study:

  • Investigate the complexation of main-group metal cations with [2.2.2]paracyclophane and deltaphane.
  • Determine preferred coordination modes and thermodynamic stability of these complexes.
  • Analyze bonding properties to understand metal-cation-cyclophane interactions.

Main Methods:

  • Density functional theory (DFT) calculations using the PBE0-D3BJ hybrid functional.
  • Geometry optimization under symmetry constraints.
  • Morokuma-Ziegler energy decomposition analysis, natural bond orbital (NBO) analysis, and Bader's analysis.

Main Results:

  • Main-group metal cations predominantly adopt an η⁶η⁶η⁶ coordination mode within the cyclophane cavity.
  • [2.2.2]Paracyclophane complexes exhibit higher thermodynamic stability compared to deltaphane analogues.
  • Deltaphane complexes show stronger coordination based on interaction energy, despite lower thermodynamic stability.

Conclusions:

  • The study elucidates the coordination behavior and stability trends of main-group metal cations within cyclophane hosts.
  • Findings provide insights into the nuanced interplay between thermodynamic stability and interaction strength in supramolecular complexes.
  • Computational methods reveal key factors governing metal-cation encapsulation by cyclophanes.