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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

11.4K
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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Structural Isomerism02:34

Structural Isomerism

21.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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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

1.4K
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

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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Updated: Feb 23, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Rotationally Active Ligands: Dialing-Up Multiple Interlocked Co-Conformations for Silver(I) Coordination.

Giorgio Baggi1, Stephen J Loeb1

  • 1Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, N9B 3P4, Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 30, 2017
PubMed
Summary

A novel rotaxane ligand with a unique H-shaped axle and crown ether wheel was synthesized. This interlocked molecule effectively binds silver(I) metal ions through various donor sets.

Keywords:
co-conformationcoordination chemistrymechanically interlocked moleculesrotaxanessilver(I) binding

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Organic Synthesis

Background:

  • Rotaxanes are mechanically interlocked molecules with potential applications in molecular machines and sensors.
  • Crown ethers are macrocyclic compounds known for their ability to bind metal cations.
  • Designing novel ligands with tunable coordination environments is crucial for developing new metal-binding agents.

Purpose of the Study:

  • To synthesize a novel [2]rotaxane ligand incorporating a bidentate N,N'-chelate and a crown ether macrocycle.
  • To investigate the coordination properties of the synthesized rotaxane ligand.
  • To explore the potential of this rotaxane for binding silver(I) ions.

Main Methods:

  • Synthesis of the H-shaped axle containing the N,N'-chelate.
  • Preparation of the 24-membered crown ether macrocycle with a trans olefinic group.
  • Characterization of the [2]rotaxane structure using spectroscopic techniques.
  • Investigation of metal ion binding using titration experiments.

Main Results:

  • Successful synthesis of a novel [2]rotaxane ligand with a rigid H-shaped axle and a crown ether wheel.
  • The rotaxane ligand exhibits unique interlocked connectivity.
  • The ligand demonstrates the ability to bind Ag(I) metal ions.
  • The donor sets within the rotaxane can be varied to tune metal ion binding.

Conclusions:

  • A novel [2]rotaxane ligand has been successfully prepared.
  • The unique structure allows for diverse coordination environments.
  • The synthesized rotaxane is a promising ligand for binding silver(I) ions.