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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Structural Isomerism02:34

Structural Isomerism

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 be...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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.
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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Bis(metallo) capsules based on two ionic diphosphines.

Tehila S Koblenz1, Henk L Dekker, Chris G de Koster

  • 1Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Postbox 94720, 1090 GS Amsterdam, The Netherlands.

Chemistry, an Asian Journal
|July 6, 2011
PubMed
Summary

Researchers created novel heterodimeric diphosphine capsules using ionic interactions. These self-assembled structures can encapsulate transition metals, paving the way for new metallosupramolecular chemistry.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Diphosphine ligands are crucial in coordination chemistry.
  • Self-assembly offers a powerful route to construct complex molecular architectures.
  • Ionic interactions can drive the formation of ordered supramolecular structures.

Purpose of the Study:

  • To describe the self-assembly and characterization of novel heterodimeric diphosphine capsules.
  • To explore the encapsulation of transition metals within these capsules.
  • To investigate the formation of bis(metallo) capsules containing two different transition metals.

Main Methods:

  • Synthesis of novel tetrasulfonato-xantphos and tetraammonium-diphosphine ligands.
  • Self-assembly of metallosupramolecular capsules using ionic interactions.
  • Characterization using NMR spectroscopy (1H, 1D-NOESY), Electrospray Ionization Mass Spectrometry (ESIMS), and computational modeling.

Main Results:

  • Successfully formed two types of heterodimeric diphosphine capsules via ionic self-assembly.
  • Demonstrated the encapsulation of transition metals (e.g., rhodium) within the capsules.
  • Achieved simultaneous encapsulation of two different transition metals (e.g., palladium, platinum, rhodium) in bis(metallo) capsules.
  • Confirmed the formation of well-defined capsular structures through spectroscopic and modeling studies.

Conclusions:

  • Heterodimeric diphosphine capsules can be effectively constructed through multiple ionic interactions.
  • The self-assembly approach allows for controlled encapsulation of transition metals, including the formation of bis(metallo) capsules.
  • Ligand design, including flexibility and charge, plays a key role in the formation of stable and functional metallocapsules.