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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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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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Supramolecular anion recognition by β-HCH.

Monica I Rednic1, Richard A Varga1, Attila Bende2

  • 1Babeş-Bolyai University, Department of Chemistry and CSOOMC, 11 Arany Janos, 400028, Cluj-Napoca, Cluj, Romania. igrosu@chem.ubbcluj.ro.

Chemical Communications (Cambridge, England)
|October 11, 2016
PubMed
Summary

This study reveals how specific chemical interactions, called C(aliphatic)-H·anion contacts, create ordered molecular structures. These interactions involve beta-alanyl-L-histidine (β-HCH) and common anions, forming predictable supramolecular assemblies.

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Area of Science:

  • Supramolecular Chemistry
  • Crystal Engineering
  • Chemical Physics

Background:

  • Supramolecular chemistry focuses on the study of complex chemical systems formed by the association of two or more molecules.
  • Understanding non-covalent interactions is crucial for designing ordered molecular assemblies.
  • C-H···anion interactions are increasingly recognized as important directing forces in crystal engineering.

Purpose of the Study:

  • To investigate the formation of highly ordered supramolecular architectures.
  • To explore the role of cooperative C(aliphatic)-H·anion contacts in self-assembly.
  • To examine the interactions between beta-alanyl-L-histidine (β-HCH) and various anions (Cl-, Br-, I-, HSO4-).

Main Methods:

  • Single crystal X-ray diffractometry to determine precise molecular structures.
  • Molecular modeling to understand interaction energies and geometries.
  • Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm molecular species in solution.
  • Proton Nuclear Magnetic Resonance (1H-NMR) titrations to study binding affinities and stoichiometry.

Main Results:

  • Highly ordered supramolecular architectures were successfully formed.
  • Cooperative C(aliphatic)-H·anion contacts were identified as the primary driving force for assembly.
  • The strength and geometry of these interactions varied depending on the specific anion.
  • β-HCH demonstrated a propensity to form specific hydrogen-bonded networks with anions.

Conclusions:

  • C(aliphatic)-H·anion interactions are effective in directing the self-assembly of supramolecular structures.
  • The choice of anion significantly influences the resulting supramolecular architecture.
  • This work provides insights into the rational design of functional supramolecular materials based on anion recognition.