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Multi-component coordination-driven self-assembly: construction of alkyl-based structures and molecular modelling.

J Bryant Pollock1, Timothy R Cook, Gregory L Schneider

  • 1Department of Chemistry, University of Utah, 315 S. 1400 E. Rm. 2214 HEB-N, Salt Lake City, UT 84112 (USA).

Chemistry, an Asian Journal
|June 19, 2013
PubMed
Summary

Researchers developed new flexible supramolecular coordination complexes (SCCs) using a novel design principle. This approach allows for the creation of complex 2D and 3D structures with long alkyl chains, expanding possibilities in materials science.

Keywords:
Lewis base donorsmolecular modelingplatinumself-assemblysupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Traditional supramolecular coordination complex (SCC) design relies on rigid building blocks and predictable coordination geometries.
  • Three-component systems offer increased complexity by using multiple Lewis base donors with metal centers.
  • Metal centers often exhibit a thermodynamic preference for heteroligation, creating mixed coordination environments.

Purpose of the Study:

  • To introduce a new design principle for SCCs based on thermodynamic preference for heteroligation.
  • To synthesize and characterize flexible 2D and 3D SCCs using alkyl-based dicarboxylate ligands.
  • To investigate the self-selection processes in bis(phosphine) Pt(II) metal centers favoring mixed coordination spheres.

Main Methods:

  • Utilizing bis(phosphine) Pt(II) metal centers with pyridyl and alkyl-based dicarboxylate ligands.
  • Employing self-assembly processes to form supramolecular coordination complexes.
  • Characterization of the resulting 2D and 3D SCCs.
  • Performing Density Functional Theory (DFT) and Natural Population Analysis (NPA) calculations on model systems.

Main Results:

  • Demonstrated the thermodynamic preference of Pt(II) centers for mixed Pt(pyridyl)(carboxylate) coordination spheres over homoligated ones.
  • Successfully synthesized novel flexible 2D and 3D SCCs incorporating long alkyl chains.
  • Computational analysis supported the experimental findings regarding heteroligation preference.

Conclusions:

  • Flexible ligands can be effectively used in SCC design, challenging the reliance on rigid components.
  • The thermodynamic preference for heteroligation provides a versatile strategy for constructing complex multicomponent architectures.
  • This work opens new avenues for designing functional materials with tunable properties based on flexible SCCs.