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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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Complexation Equilibria: The Chelate Effect01:19

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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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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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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Related Experiment Video

Updated: May 30, 2025

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Metal-Translocation-Coupled Ligand-Binding/Release by Dinuclear Rhodium Sandwich Complexes.

Iori Inoue1, Yukiho Aida1, Koji Yamamoto2

  • 1Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 28, 2025
PubMed
Summary

Molecular machines can control metal atom movement. This study shows reversible rhodium movement in organometallic complexes, controlled by ligand binding and release, enabling molecular assembly and disassembly.

Keywords:
dinuclear complexesmetal translocationmolecular switchrhodium complexessandwich complexes

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • The dynamic control of metal atom positions within molecules is crucial for developing advanced molecular machines.
  • Understanding metal-ligand interactions is key to designing responsive molecular systems.

Purpose of the Study:

  • To demonstrate reversible metal translocation coupled with ligand binding/release in organometallic complexes.
  • To investigate the mechanism of metal-assembly and disassembly in response to external stimuli.

Main Methods:

  • Synthesis and characterization of rhodium-arylpolyene complexes.
  • Investigation of metal migration using Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Structural elucidation of different states using X-ray diffraction analysis.

Main Results:

  • Observed reversible migration of rhodium moieties between arene and olefin sites within arylpolyene ligands.
  • Demonstrated that metal assembly and disassembly are triggered by the association and dissociation of bridging and non-bridging ligands.
  • Confirmed ligand-induced oxidative π-addition for non-bridging ligands.

Conclusions:

  • Reversible metal translocation can be effectively coupled to ligand-binding events in organometallic complexes.
  • This controllable metal movement provides a mechanism for dynamic molecular assembly and disassembly.
  • The findings offer new strategies for designing responsive and adaptive molecular machines.