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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
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Space Trusses

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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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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A triaxial supramolecular weave.

Urszula Lewandowska1, Wojciech Zajaczkowski2, Stefano Corra1

  • 1Laboratory of Organic Chemistry, D-CHAB, ETH Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland.

Nature Chemistry
|October 25, 2017
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Summary
This summary is machine-generated.

Researchers created a novel triaxial supramolecular weave using self-assembled organic threads. This robust, microscopic weave features uniform pores capable of hosting nanoparticles for potential applications.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Nanotechnology

Background:

  • Achieving complex molecular weaves, especially at the nano- and microscopic scales, remains a significant synthetic challenge.
  • Existing diaxial molecular weaves typically rely on metal templation, limiting the scope of accessible structures.
  • The development of purely organic, multi-axial woven architectures is highly desirable for advanced materials design.

Purpose of the Study:

  • To design and synthesize a novel, extended triaxial supramolecular weave using self-assembled organic building blocks.
  • To investigate the self-assembly process and the structural characteristics of the resulting woven superstructure.
  • To evaluate the robustness and potential applications of the fabricated supramolecular weave.

Main Methods:

  • Self-assembly of a specifically designed organic building block containing rigid oligoproline segments and perylene-monoimide chromophores.
  • Utilizing π-stacking interactions of chromophores to form molecular threads with alternating voids.
  • Employing CH-π interactions to drive the assembly of threads into a triaxial woven superstructure.
  • Characterization of the supramolecular weave's structure, robustness, and pore characteristics.

Main Results:

  • Successful formation of an extended triaxial supramolecular weave from self-assembled organic threads.
  • The weave exhibits alternating up- and down-facing voids along the threads, facilitating further assembly.
  • The resulting micrometre-scale weave demonstrates enhanced robustness compared to non-woven analogues.
  • Uniform hexagonal pores within the weave were capable of encapsulating iridium nanoparticles.

Conclusions:

  • A novel, purely organic, triaxial supramolecular weave has been successfully constructed through a hierarchical self-assembly process.
  • The CH-π interactions play a crucial role in stabilizing the woven architecture.
  • The robust nature and tunable pore structure of the supramolecular weave offer promising avenues for hosting nanoparticles and potential technological applications.