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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.
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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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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexometric Titration: Ligands00:43

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2.4K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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21.0K
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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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Macrocyclic bis(ureas) as ligands for anion complexation.

Claudia Kretschmer1, Gertrud Dittmann1, Johannes Beck1

  • 1Institute for Inorganic Chemistry, University of Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.

Beilstein Journal of Organic Chemistry
|August 28, 2014
PubMed
Summary

Two novel macrocyclic bis(ureas) were synthesized and studied for their complexation abilities. The larger ring compound effectively binds anions, demonstrating potential as a selective complexing agent.

Keywords:
NMR spectraanion bindingmacrocyclic compoundssupramolecular chemistrytemplateurea

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Crystal Engineering

Background:

  • Macrocyclic compounds are crucial in supramolecular chemistry for molecular recognition.
  • Bis(urea) macrocycles offer unique hydrogen bonding capabilities for guest binding.
  • Previous studies highlight the importance of ring size and linker flexibility in host-guest interactions.

Purpose of the Study:

  • To synthesize and characterize two novel macrocyclic bis(ureas) with varying ring sizes and linker compositions.
  • To investigate the complexation behavior of these macrocycles with polar solvent molecules and various anions.
  • To explore the potential of these compounds as selective anion receptors.

Main Methods:

  • Synthesis of macrocyclic bis(ureas) 1 (smaller ring, ethynylene linkers) and 2 (larger ring, butadiynylene linkers).
  • Thermal analysis of compound 1.
  • Formation and characterization of adducts with dimethyl sulfoxide (DMSO) and dimethylformamide (DMF).
  • Anion complexation studies using various anions (Cl-, Br-, I-, NO3-, HSO4-).
  • X-ray crystallography for structure determination of key compounds and complexes.
  • (1)H NMR titrations for quantitative analysis of complexation equilibria.

Main Results:

  • Compounds 1 and 2 were successfully synthesized, based on a diphenylurea core.
  • Compound 1 undergoes thermal decomposition into dihydroindoloquinolinone (3) at 130 °C.
  • Both macrocycles form stable adducts with DMSO and DMF.
  • Compound 2 exhibits significant anion binding affinity, with association constants up to log K = 7.93 for chloride ions.
  • Crystal structures of 3, 2·2DMSO, 2·2DMF, and NEt4[Br·2] were determined, providing insights into binding modes.

Conclusions:

  • The synthesized macrocyclic bis(ureas) display distinct properties based on their structural features.
  • Compound 2, the larger macrocycle, demonstrates potent anion binding capabilities, particularly for chloride.
  • The study provides valuable insights into the design of macrocyclic receptors for anion recognition.