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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Light-Controlled Interconversion between a Self-Assembled Triangle and a Rhombicuboctahedral Sphere.

Muxin Han1, Yuansu Luo2, Bernd Damaschke2

  • 1Institut für Anorganische Chemie, Georg-August Universität Göttingen, Tammannstrasse 4, 37077, Göttingen (Germany).

Angewandte Chemie (International Ed. in English)
|November 27, 2015
PubMed
Summary
This summary is machine-generated.

Light triggers reversible structural changes in self-assembled molecules. A palladium ring transforms into a sphere and back, demonstrating light-controlled molecular rearrangements for potential applications.

Keywords:
cage compoundsnanoparticlesphotoswitchesstructural conversionsupramolecular chemistry

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Nanotechnology

Background:

  • Stimuli-responsive structural changes are crucial in biological systems.
  • Light is an effective external trigger for supramolecular systems.
  • Photochromic molecules enable light-induced transformations.

Purpose of the Study:

  • To report the light-driven structural rearrangement of a self-assembled palladium-dithienylethene (DTE) complex.
  • To investigate the reversible interconversion between a Pd3L6 ring and a Pd24L48 sphere.
  • To analyze the kinetic differences in the light-induced structural changes.

Main Methods:

  • Self-assembly of palladium-dithienylethene (DTE) ligands.
  • Photochromic switching using specific light wavelengths.
  • Characterization by NMR, UV/Vis spectroscopy, and mass spectrometry.
  • Visualization using Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), and Grazing-Incidence Small-Angle X-ray Scattering (GISAXS).

Main Results:

  • A small, self-assembled Pd3L6 ring undergoes light-driven rearrangement into a larger, rhombicuboctahedral Pd24L48 sphere (approx. 6.4 nm).
  • The structural interconversion is fully reversible upon changing the light wavelength.
  • Significant differences in interconversion rates were observed due to varying photoswitch conformations.

Conclusions:

  • Demonstrated light-induced, reversible structural transformation in a supramolecular palladium assembly.
  • Highlighted the potential of photochromic ligands for designing responsive nanomaterials.
  • Showcased the utility of advanced characterization techniques for analyzing dynamic structural changes.