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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...
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...
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...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

Organometallic complexes as anion hosts.

Julio Pérez1, Lucía Riera

  • 1Departamento de Química Orgánica e Inorgánica I.U.Q.O.E.M., Facultad de Química, Universidad de Oviedo-C.S.I.C., 33006, Oviedo, Spain. japm@uniovi.es

Chemical Communications (Cambridge, England)
|January 23, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed novel anion hosts utilizing stable organometallic cores and hydrogen-bonding ligands. This work introduces a new method for creating advanced host materials for anion recognition and binding applications.

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Area of Science:

  • Supramolecular Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Anion recognition is crucial for various chemical and biological processes.
  • Developing new host materials with tailored properties remains a significant challenge.
  • Existing anion hosts often lack stability or specific binding capabilities.

Purpose of the Study:

  • To synthesize and characterize novel supramolecular anion hosts.
  • To explore the utility of cationic organometallic fragments as structural cores.
  • To investigate the role of ditopic ligands and specific anions in host-guest chemistry.

Main Methods:

  • Utilized kinetically stable cationic organometallic fragments as geometry-organizing cores.
  • Employed simple ditopic ligands with hydrogen bond donor groups.
  • Incorporated the inert, lipophilic tetrakis(bis-3,5-trifluoromethylphenyl)borate (BAr'(4)) anion.
  • Characterized the resulting host materials using spectroscopic and crystallographic techniques.

Main Results:

  • Successfully synthesized new classes of supramolecular anion hosts.
  • Demonstrated the effectiveness of organometallic cores in directing host assembly.
  • Showcased the importance of hydrogen bonding interactions for anion binding.
  • Confirmed the inertness and lipophilicity of the BAr'(4) anion contribute to host stability.

Conclusions:

  • Cationic organometallic fragments are viable building blocks for anion host design.
  • Ditopic ligands and specific counteranions enable the construction of robust anion hosts.
  • This approach offers a versatile platform for developing advanced anion recognition materials.