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Related Concept Videos

Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...
Series and Parallel Inductors01:17

Series and Parallel Inductors

In electrical circuits, integrating inductors into the toolkit of passive elements requires navigating the intricacies of series and parallel combinations involving these components. Practical circuits often feature configurations of multiple inductors, and understanding how to determine their equivalent inductance is vital.
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An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,
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An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the applied...
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Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Updated: Jul 14, 2026

Fast Inspection of Quality of Indigo Naturalis by Multiple Light Scattering
03:40

Fast Inspection of Quality of Indigo Naturalis by Multiple Light Scattering

Published on: August 18, 2023

Indigo: an annotated bibliography.

C J Cooksey1

  • 1dha@chriscooksey.demon.co.uk

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|June 20, 2007
PubMed
Summary

This bibliography covers indigo and related dyes, detailing their history, chemistry, preparation, and applications. It provides expert commentary on key publications for researchers in dye science.

Area of Science:

  • Organic Chemistry
  • Materials Science
  • Textile Chemistry

Context:

  • Indigo and related dyes represent a significant class of organic compounds with historical and industrial importance.
  • Understanding the synthesis and properties of these dyes is crucial for various applications.

Purpose:

  • To compile and critically review existing literature on indigo and related dyes.
  • To provide researchers with a comprehensive resource on the history, preparation, chemistry, and applications of these colorants.

Summary:

  • This work is a bibliography that lists and annotates publications concerning the history, preparation, chemistry, and applications of indigo and related dyes.
  • Each bibliographic entry is followed by italicized commentary from the author, offering critical insights.

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Last Updated: Jul 14, 2026

Fast Inspection of Quality of Indigo Naturalis by Multiple Light Scattering
03:40

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Published on: August 18, 2023

Synthesis of Indoxyl-glycosides for Detection of Glycosidase Activities
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Synthesis of Indoxyl-glycosides for Detection of Glycosidase Activities

Published on: May 27, 2015

Impact:

  • Facilitates further research and development in dye chemistry and applications.
  • Serves as a foundational reference for chemists, historians, and material scientists interested in indigo dyes.