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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Two-dimensional coordination polymeric structures in caesium complexes with ring-substituted phenoxyacetic acids.

Graham Smith1, Daniel E Lynch2

  • 1Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.

Acta Crystallographica. Section C, Structural Chemistry
|June 6, 2014
PubMed
Summary
This summary is machine-generated.

This study describes novel two-dimensional polymeric structures of caesium complexes with phenoxyacetic acid derivatives. These caesium coordination polymers exhibit diverse structural motifs and bonding interactions, contributing to understanding alkali metal carboxylate materials.

Keywords:
caesium complexescrystal structurephenoxyacetic acid analoguestwo-dimensional coordination polymer

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Crystallography

Background:

  • Alkali metal salts of carboxylic acids are known to form various coordination polymers.
  • Phenoxyacetic acid derivatives, including herbicidal compounds like 2,4-D, offer diverse functional groups for complexation.
  • Understanding the structural diversity of caesium complexes is crucial for designing novel materials.

Purpose of the Study:

  • To synthesize and characterize novel two-dimensional polymeric caesium complexes with phenoxyacetic acid analogues.
  • To elucidate the coordination environments and structural features of these caesium complexes.
  • To investigate the role of ligand structure and substituents in directing the formation of polymeric architectures.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the detailed structures of the caesium complexes.
  • Synthesis of caesium complexes with (4-fluorophenoxy)acetic acid, (3-chloro-2-methylphenoxy)acetic acid, and (2,4-dichlorophenoxy)acetic acid.
  • Analysis of coordination numbers, bonding interactions (carboxylate bridging, chelation), and intermolecular forces (hydrogen bonding).

Main Results:

  • Three distinct two-dimensional polymeric caesium complexes were structurally characterized.
  • Complex (I) features Cs(+) cations with CsO7 and CsO8 coordination polyhedra linked by bridging carboxylates, forming layers parallel to (001).
  • Complex (II) is a hydrated structure with nine-coordinate Cs(+), forming layers parallel to (100) with intralayer hydrogen bonding.
  • Complex (III) exhibits an irregular CsO6Cl2 coordination environment with bridging carboxylates and hydrogen-bonded duplex ligand species, forming layers parallel to (001).

Conclusions:

  • The study successfully synthesized and characterized novel 2D polymeric caesium complexes with phenoxyacetic acid derivatives.
  • Structural diversity arises from varying coordination numbers of Cs(+) and the coordination modes of the phenoxyacetate ligands.
  • These findings align with established trends in alkali metal carboxylate structures, highlighting the influence of substituent groups on polymer formation.