Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Complexometric Titration: Overview00:39

Complexometric Titration: Overview

7.5K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
7.5K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
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...
12.3K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.1K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
1.1K
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

1.1K
EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p function) as a function of the volume of EDTA added. This curve consists of three regions: before, at, and after equivalence points. Excess free metal ions are present before the equivalence point. Equal concentrations of metal ions and EDTA are present at the equivalence point. After the equivalence point, excess EDTA exists. This means slight...
1.1K
Coulometry: Overview01:00

Coulometry: Overview

1.6K
Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
1.6K
Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

231
Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
231

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Ligand-enabled distal desaturative lactonization of aliphatic acids.

Nature·2026
Same author

Efficient Visible-Light Photosensitization of a Nonheme Fe-Molecular Catalyst by Colloidal CuInS<sub>2</sub> Quantum Dots with ZnS Shells for Selective Reduction of CO<sub>2</sub> to CO in Water.

ACS applied materials & interfaces·2026
Same author

Pendant amine-promoted complete eight-electron photoreduction of CO<sub>2</sub> to methane by a molecular nickel catalyst.

Chemical science·2026
Same author

Ligand-Controlled Pd(II)-Catalyzed α,β-Unsaturation and β-Arylation of Long-Chain Acids.

Journal of the American Chemical Society·2026
Same author

Prevalence and Impact of Oro-Dental Trauma Among 13-18-Year-Old Contact Sportspersons in Lucknow, North India: A Mixed-Methods Study.

Dental traumatology : official publication of International Association for Dental Traumatology·2026
Same author

Bio-Inspired Flow Field Design for Enhanced Mass Transport in CO<sub>2</sub> Electrolyzers: A Multiphysics Modeling Approach.

ACS omega·2026

Related Experiment Video

Updated: Sep 1, 2025

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
10:38

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems

Published on: March 3, 2010

14.0K

Exploring the Cobalt-Histidine Complex for Wide-Ranging Colorimetric O2 Detection.

Abhishek Saini1, Surabhi Rai1,2, Debabrata Maiti1,3

  • 1Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

ACS Omega
|August 15, 2022
PubMed
Summary

A novel cobalt(l-histidine)2 complex enables rapid and reliable detection of molecular oxygen (O2) across all saturation levels. This bioinspired sensor, usable with a smartphone, offers a cost-effective solution for industrial gas monitoring.

More Related Videos

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
08:57

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases

Published on: February 24, 2018

10.2K
Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
08:31

Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition

Published on: October 3, 2018

8.6K

Related Experiment Videos

Last Updated: Sep 1, 2025

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
10:38

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems

Published on: March 3, 2010

14.0K
Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
08:57

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases

Published on: February 24, 2018

10.2K
Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
08:31

Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition

Published on: October 3, 2018

8.6K

Area of Science:

  • Bioinspired chemistry
  • Chemical sensing
  • Materials science

Background:

  • Monitoring molecular oxygen (O2) is crucial across industrial applications.
  • Existing O2 sensors can be costly, complex, or lack user-friendliness.
  • Bioinspired materials offer potential for advanced sensing capabilities.

Purpose of the Study:

  • To develop a robust, cost-effective, and user-friendly sensor for molecular oxygen (O2) detection.
  • To explore the application of a cobalt(l-histidine)2 complex for O2 sensing.
  • To establish colorimetric methods for O2 detection using smartphone technology.

Main Methods:

  • Utilized a cobalt(l-histidine)2 complex as a bioinspired O2 sensor.
  • Developed two distinct colorimetric O2 detection techniques.
  • Employed smartphone cameras and color-detecting software for analysis.
  • Conducted spectroscopic experiments to confirm molecular changes.

Main Results:

  • The cobalt(l-histidine)2 complex demonstrated rapid and reliable O2 sensing from 0 to 100% saturation.
  • A distinct pink-to-brown color change was observed upon oxygen exposure.
  • Colorimetric detection was successfully achieved using smartphone technology.
  • Spectroscopic data confirmed oxygen-induced molecular alterations in the complex.

Conclusions:

  • The cobalt(l-histidine)2 complex serves as an effective bioinspired sensor for broad-spectrum O2 detection.
  • Smartphone-based colorimetric methods provide a practical and accessible approach to O2 sensing.
  • This study presents a template for designing bioinspired molecular complexes for diverse industrial applications.