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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.7K
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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Valence Bond Theory02:42

Valence Bond Theory

8.7K
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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Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
12.9K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.9K
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.
15.9K
Structural Isomerism02:34

Structural Isomerism

19.3K
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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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Ligand-Directed Shape Reconfiguration in Inorganic Materials.

Nishat Paul1, Lecheng Zhang2, Shijun Lei2

  • 1Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|September 19, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed shape-changing clay nanoparticles by controlling surface functionalization. These flexible nanoparticles can transform shape reversibly and act as self-propelled nanomachines for rare earth element collection.

Keywords:
asymmetrical modificationrare earth recoveryshape-changingstereochemistrysurface chemistry

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Polymer elastomers enable shape-changing artificial muscles and soft robots.
  • Reversible shape transformation in inorganic nanoparticles is difficult due to rigid lattices.

Purpose of the Study:

  • To synthesize shape-changing inorganic nanoparticles.
  • To investigate the mechanism of reversible nanoparticle shape transformation.
  • To develop self-propelled nanomachines for element adsorption.

Main Methods:

  • Asymmetrical surface functionalization of clay nanoparticles using various ligands.
  • Investigating the role of steric hindrance from functional groups on shape transformation.
  • Demonstrating self-propelled motion and ion adsorption capabilities.

Main Results:

  • Achieved fast, facile, and reversible shape transformation in clay nanoparticles.
  • Identified unbalanced structural hindrance on the nanoparticle surface as key.
  • Developed self-propelled nanoswimmers capable of autonomously adsorbing rare earth elements.

Conclusions:

  • Asymmetrical surface functionalization enables reversible shape transformation in inorganic nanoparticles.
  • This mechanism provides a platform for creating self-propelled nanomachine applications.
  • Naturally occurring materials can be utilized for self-powered nanomachine development.