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Related Concept Videos

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembled layers based on isomerizable stilbene and diketoarylhydrazone moieties.

Jan Marten1, Andreas Erbe, Kevin Critchley

  • 1Technische Universität Bergakademie Freiberg, Institut für Organische Chemie, Leipziger Strasse 29, 09596 Freiberg, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 9, 2008
PubMed
Summary

Researchers explored self-assembled layers on gold using organosulfur compounds with isomerizable groups. Molecular structure significantly impacts self-assembly, with only specific compounds forming expected monolayers or incorporating novel moieties.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Organosulfur compounds are crucial for creating self-assembled monolayers (SAMs) on gold surfaces.
  • The incorporation of isomerizable groups, such as stilbene and diketoarylhydrazone derivatives, offers potential for novel functional materials.
  • Understanding the influence of molecular structure on self-assembly is key for designing advanced surface coatings.

Purpose of the Study:

  • To investigate the self-assembly of five organosulfur compounds containing isomerizable groups on gold surfaces.
  • To determine the impact of different sulfur-containing anchoring groups (disulfide, 1,2-dithiolane, thiophene) and isomerizable moieties on monolayer formation.
  • To explore the potential of incorporating diarylketohydrazone functionalities into SAMs.

Main Methods:

  • Synthesis of five organosulfur compounds with varying sulfur anchoring groups and isomerizable moieties.
  • Characterization of self-assembled layers using X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) reflectance spectroscopy, ellipsometry, and water contact angle measurements.
  • Analysis of molecular structures and their correlation with self-assembly behavior on gold.

Main Results:

  • Only two compounds, disulfanediyl-bis(ethane-2,1-diyl) bis(4-styrylbenzoate) (1) and 4-[(2,4-dioxo-3-pentylidene)diazane-2,2,1-triyl]phenyl thioctate (4), formed the expected SAM structures.
  • Compound 4 demonstrated the successful incorporation of diarylketohydrazone moieties into SAMs.
  • Other compounds showed varied assembly behaviors, including multilayer formation (3) or potential binding via nitro groups (2), and failure to self-assemble (5).

Conclusions:

  • The self-assembly of organosulfur compounds on gold is influenced by both the sulfur-containing anchor and the overall molecular structure.
  • The presence and type of isomerizable groups significantly affect the ability to form well-defined self-assembled monolayers.
  • Diarylketohydrazone moieties can be successfully integrated into SAMs on gold surfaces, opening avenues for new functional materials.