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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Structure-Function Correlation in Switchable DTE@MOF Hybrids: Tracking Local Dynamics and Fatigue Pathways.

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Investigating photoswitchable molecules in metal-organic frameworks (MOFs) reveals how their movement affects light-induced changes. Nanoconfinement within MOF pores influences photochromic response and fatigue resistance.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Understanding photoswitchable molecules in porous materials is crucial for advanced optical applications.
  • The high mobility of guest molecules within metal-organic frameworks (MOFs) complicates the study of their optical properties and photochromic behavior.
  • Dye-MOF interactions significantly influence photochromic response and fatigue resistance.

Purpose of the Study:

  • To investigate the light-induced isomerization of a dithienylethene chromophore within the UiO-67 metal-organic framework.
  • To elucidate the impact of structural rearrangements and host-guest interactions on photochromic properties and fatigue resistance.
  • To provide an atomic-level understanding of the stabilization of different chromophore conformers within the MOF.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (ssNMR) spectroscopy to characterize guest molecule embedment and physical state.
  • X-ray diffraction experiments to analyze structural changes in the MOF and guest molecule.
  • Diffuse reflectance spectroscopy to monitor photochromic response and fatigue.
  • Molecular Dynamics (MD) simulations at the semiempirical quantum chemical level to understand host-guest interactions.

Main Results:

  • Solid-state NMR and X-ray diffraction confirmed the embedment and physical state of the photoswitchable dye within UiO-67.
  • Diffuse reflectance spectroscopy indicated slight fatigue due to nanoconfinement effects within the MOF pores.
  • The open, photoinactive form of the chromophore preferentially occupies MOF side pores, leading to photoswitching fatigue.
  • MD simulations revealed specific host-guest interactions and the stabilization of the compact photoinactive conformer.

Conclusions:

  • The study provides a comprehensive understanding of photoswitchable molecule behavior within MOFs, combining experimental and computational approaches.
  • Nanoconfinement effects and specific pore occupation by different chromophore forms are key factors affecting photochromic performance and fatigue in MOFs.
  • This research offers insights into designing robust photoresponsive materials based on MOF-dye systems.