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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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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Isomerism in Complexes
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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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Improving the mesomorphism in bispyrazolate Pd(II) metallomesogens: an efficient platform for ionic conduction.

Cristián Cuerva1, Mercedes Cano1, Rainer Schmidt2

  • 1MatMoPol Group. Department of Inorganic Chemistry, Faculty of Chemical Sciences, Complutense University of Madrid, Ciudad Universitaria, E-28040 Madrid, Spain. c.cuerva@ucm.es.

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|February 13, 2023
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Summary
This summary is machine-generated.

Introducing structural asymmetry in palladium(II) metallomesogens creates novel liquid crystals with low melting points and high thermal stability. These materials show promise for developing advanced, water-free electrolytes for proton exchange membranes (PEMs).

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Structural asymmetry in metallomesogens enhances mesomorphic behavior, crucial for electrolytes needing wide operational temperature ranges.
  • Metallomesogens are key materials for advanced applications, including energy storage and conversion.

Purpose of the Study:

  • To synthesize and characterize a novel series of unsymmetrical bis(isoquinolinylpyrazolate)palladium(II) compounds.
  • To investigate the liquid crystalline properties and charge transport mechanisms of these new metallomesogens.
  • To evaluate their potential as water-free electrolytes for applications like proton exchange membranes (PEMs).

Main Methods:

  • Synthesis of unsymmetrical bis(isoquinolinylpyrazolate)palladium(II) complexes with varying alkyl side-chain lengths.
  • Characterization of mesomorphic behavior using techniques like differential scanning calorimetry and polarized optical microscopy.
  • Study of charge transport properties via complex impedance spectroscopy.

Main Results:

  • The synthesized compounds exhibit rectangular and hexagonal columnar mesophases with low melting temperatures (42-45 °C) and high clearing temperatures (up to 412 °C).
  • Complex impedance spectroscopy revealed that the mesophase facilitates proton conduction in the absence of water.
  • The exceptional thermal stability and self-assembled nanochannels in the columnar mesophases are highlighted.

Conclusions:

  • Introducing structural asymmetry in palladium(II) metallomesogens effectively enhances liquid crystalline properties.
  • These unsymmetrical Pd(II) compounds are promising candidates for developing stable, water-free electrolytes.
  • The findings open new avenues for designing materials for proton exchange membranes (PEMs) and other ionic conduction applications.