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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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Structural Isomerism02:34

Structural Isomerism

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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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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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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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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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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Shape-Memory Metallopolymers Based on Two Orthogonal Metal-Ligand Interactions.

Josefine Meurer1,2, Julian Hniopek3,4,5, Thomas Bätz1,2

  • 1Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstr. 10, Jena, 07743, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|January 15, 2021
PubMed
Summary

Researchers developed a novel shape-memory polymer using dual metal complexes for tunable switching. This metallopolymer network exhibits excellent strain fixity and recovery, offering advanced material properties.

Keywords:
metallopolymersshape-memory polymerssmart materialssupramolecular polymers

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Shape-memory polymers (SMPs) are stimuli-responsive materials with applications in various fields.
  • Developing SMPs with tunable properties and efficient recovery remains a key research area.
  • Metal complexes offer unique opportunities for designing advanced polymer networks.

Purpose of the Study:

  • To synthesize and characterize a novel shape-memory polymer utilizing dual metal complexes.
  • To investigate the influence of metal ion choice and polymer composition on switching properties.
  • To elucidate the mechanism behind the shape-memory effect in the developed metallopolymer.

Main Methods:

  • Isothermal titration calorimetry (ITC) for metal ion-ligand binding analysis.
  • Synthesis of copolymers incorporating histidine and terpyridine ligands.
  • Dual crosslinking of polymer chains using zinc and nickel complexes.
  • Characterization of polymer networks and shape-memory performance (strain fixity/recovery).
  • Raman spectroscopy for mechanistic studies.

Main Results:

  • Identification of metal ions forming both labile and stable complexes with specific ligands.
  • Successful synthesis of dual crosslinked metallopolymer networks.
  • Tunable switching temperatures achieved by altering polymer composition and metal ions.
  • High strain fixity (approx. 99%) and strain recovery (up to 95%) demonstrated.
  • Mechanism of shape-memory behavior elucidated through spectroscopic analysis.

Conclusions:

  • A new class of shape-memory polymers based on dual metal complexes has been successfully developed.
  • The material exhibits excellent shape-memory performance with tunable switching characteristics.
  • This work provides a versatile platform for designing advanced metallopolymer-based shape-memory materials.