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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Protein Complex Assembly02:41

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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Synergism in multicomponent self-propagating molecular assemblies.

Leila Motiei1, Mauro Sassi, Revital Kaminker

  • 1Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 7, 2010
PubMed
Summary
This summary is machine-generated.

Multicomponent self-propagating molecular assemblies (SPMAs) exhibit exponential growth, driven by polypyridyl complexes, not linear growth. This finding advances surface-confined assembly mechanisms.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Surface Chemistry

Background:

  • Multicomponent self-propagating molecular assemblies (SPMAs) are formed using organic chromophores, redox-active polypyridyl complexes, and PdCl(2).
  • Previously, assemblies of organic chromophores and PdCl(2) showed linear growth, while polypyridyl complexes and PdCl(2) showed exponential growth.

Purpose of the Study:

  • To investigate the growth mechanism of SPMAs formed by combining organic chromophores, polypyridyl complexes, and PdCl(2).
  • To determine if the assembly mechanism is dictated by individual components or their synergistic interactions.

Main Methods:

  • Iterative deposition of molecular building blocks and PdCl(2).
  • Characterization using UV/Vis spectroscopy, ellipsometry, atomic force microscopy (AFM), X-ray reflectivity (XRR), and electrochemistry.

Main Results:

  • Iterative deposition resulted in exponentially growing SPMAs, overriding the linear growth tendency of the organic component.
  • The polypyridyl complex dictates the exponential growth mechanism, irrespective of the organic chromophore.
  • Smooth SPMAs with thicknesses around 20 nm were achieved on various substrates (silicon, glass, ITO).

Conclusions:

  • The polypyridyl complex plays a crucial role in determining the exponential growth of multicomponent SPMAs.
  • SPMAs can be controllably fabricated with desired thicknesses and surface properties.
  • Understanding these assembly mechanisms is key for designing advanced molecular materials.