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[Cp3 Ba]- : The First Structurally Characterized Barate Complex.

Sjoerd Harder1

  • 1Universität Konstanz, Postfach 5560, M738, D-78457 Konstanz (Germany), Fax: (+49) 7531-883137.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals a novel barium coordination polymer with a chain structure, [Cp3 Ba]− [Bu4 P]+. The barium atoms are tetrahedrally coordinated by cyclopentadienyl rings, forming extended chains linked by tetrabutylphosphonium cations.

Keywords:
Alkaline earth metalsBariumCarbanionsCoordination modesYlides

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Coordination polymers offer diverse structural motifs and properties.
  • Barium-based coordination compounds are less explored compared to other alkaline earth metals.
  • Understanding the self-assembly of inorganic-organic hybrid materials is crucial for designing new functional materials.

Purpose of the Study:

  • To synthesize and characterize a novel coordination polymer involving barium.
  • To elucidate the structural features and bonding interactions within the [Cp3 Ba]− [Bu4 P]+ compound.
  • To investigate the role of counterions and solvent molecules in the crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
  • Spectroscopic techniques for compound characterization (e.g., NMR, IR - though not explicitly stated in abstract, these are standard).
  • Analysis of intermolecular interactions, including hydrogen bonding and coordination geometry.

Main Results:

  • A one-dimensional coordination polymer, [Cp3 Ba]∞, with a chain structure was successfully synthesized.
  • The barium centers exhibit tetrahedral coordination by four η5-cyclopentadienyl (Cp) rings.
  • Tetrabutylphosphonium (Bu4 P+) cations act as linkers between polymer chains via hydrogen bonds, and cocrystallized THF molecules form CH⋅⋅⋅O hydrogen bonds with the cations.

Conclusions:

  • The compound [Cp3 Ba]− [Bu4 P]+ represents a new example of a barium-containing coordination polymer with a unique chain architecture.
  • The crystal structure is stabilized by a combination of coordination bonds, hydrogen bonds, and van der Waals forces.
  • The study highlights the importance of counterions and solvent molecules in directing the supramolecular assembly of coordination polymers.