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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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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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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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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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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Investigating Recurrent Matere Bonds in Pertechnetate Compounds.

Dennis Grödler1, Sergi Burguera2, Antonio Frontera2

  • 1Department of Chemistry, Division of Nuclear Chemistry, University of Cologne, Zülpicher Str. 45, 50674, Cologne, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 22, 2024
PubMed
Summary

This study reveals that Matere bonds (MaBs) and hydrogen bonds (HBs) create 1D and 2D supramolecular structures in pertechnetate and perrhenate metal complexes. These bonds influence crystal structures and material properties.

Keywords:
Matere bondsPertechnetateSupramolecular chemistryX-ray analysisperrhenate

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Area of Science:

  • Inorganic chemistry
  • Crystallography
  • Supramolecular chemistry

Background:

  • Metal complexes with pertechnetate and perrhenate anions are of interest for their structural and bonding properties.
  • Understanding the role of non-covalent interactions is crucial for designing novel materials.

Purpose of the Study:

  • To investigate the X-ray structures of new pertechnetate and perrhenate metal complexes.
  • To analyze the formation and role of Matere bonds (MaBs) and hydrogen bonds (HBs) in constructing supramolecular architectures.
  • To theoretically examine the nature of MaBs and their contribution to crystal packing.

Main Methods:

  • Synthesis and X-ray crystallographic analysis of five pertechnetate and one perrhenate complex.
  • Theoretical analysis of non-covalent interactions, including MaBs and HBs.
  • Comparison of pertechnetate and perrhenate structures to understand structure-directing roles.

Main Results:

  • Five [M(H2O)4(TcO4)2] (M=Mg, Co, Ni, Cu, Zn) and one Zn(H2O)4(ReO4)2 complexes were structurally characterized.
  • Directional Tc···O Matere bonds (MaBs) were observed, leading to 1D supramolecular polymers.
  • These polymers assemble into 2D layers through combined MaBs and hydrogen bonds (HBs), with HBs dominating the interaction energy.
  • Theoretical analysis confirmed the non-covalent, σ-hole nature of MaBs.

Conclusions:

  • Matere bonds and hydrogen bonds play a significant role in the self-assembly of pertechnetate and perrhenate complexes into extended supramolecular structures.
  • The observed isostructural nature of the zinc perrhenate complex compared to its pertechnetate analog highlights the structure-directing influence of these non-covalent interactions.
  • This study provides insights into the fundamental bonding principles governing the formation of inorganic supramolecular materials.