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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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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

19.2K
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.
19.2K
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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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.2K
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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Molecular recognition by multiple metal coordination inside wavy-stacked macrocycles.

Takashi Nakamura1, Yuya Kaneko1, Eiji Nishibori1

  • 1Graduate School of Pure and Applied Sciences and Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, 1-1-1 Tennodai, Ibaraki, Tsukuba, 305-8571, Japan.

Nature Communications
|July 27, 2017
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Summary

This study introduces a novel zinc metallomacrocycle that precisely recognizes dicarboxylic acids. It uses strong, reversible coordination bonds and shape changes for selective guest binding, advancing molecular recognition systems.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Biological and synthetic receptors often rely on weak interactions like hydrogen bonds for molecular recognition.
  • Achieving precise recognition with stronger, reversible bonds requires controlled arrangement of reactive moieties, which has been a significant challenge.

Purpose of the Study:

  • To develop a host compound capable of precise molecular recognition using synergistic, strong, yet reversible bonding.
  • To investigate the spatial arrangement and regulation of reactive interaction sites within a synthetic system.

Main Methods:

  • Synthesis of a multinuclear zinc complex using a macrocyclic ligand (hexapap).
  • Investigation of the complex's structure and binding behavior with dicarboxylic acids.
  • Utilizing acid/base stimuli to modulate guest-binding modes at specific metal coordination sites.

Main Results:

  • The synthesized metallomacrocycle forms a unique wavy-stacked structure with dicarboxylic acids via multipoint coordination bonding.
  • Saddle-shaped deformation and dimerization of the metallomacrocycle enable differentiation of interaction moieties.
  • Specific metal coordination sites within the complex demonstrated tunable guest-binding modes in response to acid/base stimuli.

Conclusions:

  • Synergistic application of strong and reversible coordination bonds enables unique molecular recognition in artificial systems.
  • The zinc-based metallomacrocycle exhibits shape deformation and dimerization for selective binding of dicarboxylic acids at specific metal sites.