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Related Concept Videos

UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and unsymmetrical carbonyl vibration.
In the...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Spectroscopic probes with changeable π-conjugated systems.

Wen Shi1, Huimin Ma

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Chemical Communications (Cambridge, England)
|July 14, 2012
PubMed
Summary

This review highlights spectroscopic probes utilizing changeable π-conjugated systems for enhanced predictability and signal. These probes offer superior analytical performance compared to traditional methods dependent on complex molecular orbital energy levels.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Spectroscopic probes are crucial for improving analytical sensitivity and resolution.
  • Existing probes often rely on photophysical mechanisms (e.g., PET, FRET) dependent on difficult-to-predict molecular orbital energy levels.
  • This dependence leads to challenges in accurately predicting probe performance.

Purpose of the Study:

  • To systematically review spectroscopic probes based on changeable π-conjugated systems.
  • To explore strategies for constructing these probes and discuss their advantages and limitations.
  • To highlight a more predictable mechanism for designing high-performance spectroscopic probes.

Main Methods:

  • Review of literature on spectroscopic probes with alterable π-conjugated systems.
  • Categorization of probes based on fluorochrome classes (e.g., fluorescein, rhodamine, cyanine).
  • Summary of key construction strategies: ring-closing and nucleophilic addition reactions.

Main Results:

  • Changeable π-conjugated systems offer predictable spectroscopic signal alterations upon chemical reaction.
  • This mechanism provides a high signal-to-background ratio, enhancing probe utility.
  • Various fluorochromes and synthetic strategies have been employed to develop such probes.

Conclusions:

  • Spectroscopic probes leveraging changeable π-conjugated systems represent a powerful and predictable approach in analytical chemistry.
  • These probes overcome limitations associated with traditional methods relying on complex photophysical mechanisms.
  • Further development in this area promises advanced analytical tools with superior performance.