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Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

5.6K
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...
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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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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...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
1.9K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

3.3K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Related Experiment Video

Updated: May 5, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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1D MXenes: Synthesis, Properties, and Applications.

Sunil Kumar1, Syed Muhammad Zain Mehdi1, Yongho Seo1

  • 1Department of Nanotechnology and Advanced Materials Engineering and HMC, Sejong University, Seoul, 05006, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|September 30, 2024
PubMed
Summary
This summary is machine-generated.

This review explores one-dimensional (1D) MXenes, highlighting their synthesis, properties, and diverse applications. These materials offer enhanced performance for next-generation technologies, despite current production challenges.

Keywords:
1D nanostructuresMXenesapplicationspropertiessynthesis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Two-dimensional (2D) MXenes exhibit remarkable properties, driving research into lower-dimensional forms.
  • Interest is growing in one-dimensional (1D) MXenes, including nanowires, nanoribbons, nanorods, and nanotubes.

Purpose of the Study:

  • To review the synthesis, properties, and applications of 1D MXenes.
  • To elucidate the potential of 1D MXenes in various scientific and technological fields.
  • To address current challenges and propose future directions for 1D MXene research.

Main Methods:

  • Exploration of diverse synthesis methodologies for 1D MXenes.
  • Examination of structural, electronic, and optical properties of 1D MXenes.
  • Review of applications leveraging the unique characteristics of 1D MXenes.

Main Results:

  • 1D MXenes inherit 2D properties while displaying unique anisotropic characteristics.
  • The transition to 1D enhances material properties, offering advantages for next-generation systems.
  • Increased aspect ratio and surface area enable broad applications in energy storage, catalysis, and sensing.

Conclusions:

  • 1D MXenes present superior properties compared to their 2D counterparts.
  • Significant potential exists for 1D MXenes in energy storage, catalysis (OER, HER, ORR), and sensing applications.
  • Overcoming challenges in synthesis, scalability, and stability is crucial for future advancements.