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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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catena-Poly[[tri-aqua-magnesium]-μ2-malonato].

Tim de Klijn1, Martin Lutz1

  • 1Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

Acta Crystallographica. Section E, Structure Reports Online
|February 15, 2014
PubMed
Summary

This study describes the crystal structure of a magnesium compound, [Mg(C3H2O4)(H2O)3]n. The structure features octa-hedral magnesium ions linked by malonate anions and hydrogen bonds into a 3D network.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Understanding the coordination chemistry of magnesium is crucial for various applications.
  • Malonate ligands are versatile building blocks in coordination polymers.
  • Metal-organic frameworks (MOFs) and coordination polymers exhibit diverse structural motifs.

Purpose of the Study:

  • To elucidate the crystal structure of the novel magnesium-malonate coordination polymer, [Mg(C3H2O4)(H2O)3]n.
  • To investigate the coordination environment of the magnesium ion.
  • To analyze the supramolecular assembly driven by hydrogen bonding.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Infrared spectroscopy was used to confirm the presence of functional groups.
  • Powder X-ray diffraction was utilized for phase purity analysis.

Main Results:

  • The title compound, [Mg(C3H2O4)(H2O)3]n, crystallizes with magnesium ions in an octahedral coordination environment.
  • Malonate anions act as linkers, connecting the octa-hedra into 1D chains along the c-axis.
  • O-H⋯O hydrogen bonds between coordinated water molecules and malonate oxygens further stabilize the structure, forming a 3D network.

Conclusions:

  • The study successfully characterized a novel 3D coordination network of magnesium and malonate.
  • The structural analysis reveals the interplay between coordination bonds and hydrogen bonds in directing the supramolecular architecture.
  • This magnesium-malonate compound serves as a model system for understanding the formation of extended structures in coordination chemistry.