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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Poly[tetra-aqua-di-μ(4)-malonato-barium(II)cadmium(II)].

Ming-Lin Guo1, Wen-Jun Gao, Cong-Cong Luo

  • 1School of Environment and Chemical Engineering and, Key Laboratory of Hollow Fiber Membrane Materials & Membrane Processes, Tianjin Polytechnic University, Tianjin 300160, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|April 28, 2011
PubMed
Summary

This study details the crystal structure of a barium-cadmium malonate complex, revealing alternating layers of metal ions and organic linkers. The intricate bonding network highlights the coordination chemistry of these metal-organic frameworks.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Coordination Chemistry

Background:

  • Malonate ligands are versatile building blocks in coordination chemistry.
  • Barium and Cadmium ions exhibit diverse coordination preferences.
  • Layered structures in metal-organic materials offer unique properties.

Purpose of the Study:

  • To elucidate the crystal structure and coordination environment of a novel barium-cadmium malonate complex.
  • To investigate the binding interactions between malonate ligands, Ba(II), and Cd(II) ions.
  • To understand the self-assembly mechanism leading to the observed layered structure.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Coordination geometry analysis of Ba(II) and Cd(II) centers.
  • Identification of hydrogen bonding networks.

Main Results:

  • The complex [BaCd(C(3)H(2)O(4))(2)(H(2)O)(4)](n) exhibits a layered structure along the [100] direction.
  • Ba(II) ions display distorted square-anti-prismatic coordination, while Cd(II) ions show distorted octahedral coordination.
  • Malonate dianions bridge both Ba(II) and Cd(II) ions, forming a robust framework.
  • Extensive O-H⋯O hydrogen bonding involving coordinated water molecules stabilizes the structure.

Conclusions:

  • The study successfully characterized a novel layered barium-cadmium malonate complex.
  • The findings provide insights into the coordination behavior of Ba(II) and Cd(II) with malonate ligands.
  • The intricate network of metal-ligand and hydrogen bonding dictates the overall structural architecture.