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

Redox Titration: Iodimetry and Iodometry01:23

Redox Titration: Iodimetry and Iodometry

6.7K
Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
6.7K
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

1.2K
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
1.2K
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

2.1K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
2.1K
Properties of Transition Metals02:58

Properties of Transition Metals

28.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
28.1K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

6.5K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.5K
Precipitation of Ions03:11

Precipitation of Ions

25.3K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
25.3K

You might also read

Related Articles

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

Sort by
Same author

Interfacial Charge Transfer Pathways in Photoelectrochemical H<sub>2</sub> Evolution by a Single-Component Molecular Catalyst on a Conductive Metal Oxide.

Journal of the American Chemical Society·2026
Same author

A Monolithic Artificial Leaf for Solar Methanol Production from CO<sub>2</sub> and H<sub>2</sub>O.

Journal of the American Chemical Society·2026
Same author

Mechanistic Insights into CO<sub>2</sub>-to-CO Photoreduction by Proton-Responsive Imidazole-Pyridine Re(I) Complexes.

Inorganic chemistry·2026
Same author

Quantitative Analysis of the Semiconductor-Electrolyte Interface Using Cyclic Voltammetry Measurements.

Journal of the American Chemical Society·2026
Same author

Photo-Migration of Chloride Ions Associated with Amide Substituents on Ruthenium Polypyridyl Complexes.

Inorganic chemistry·2025
Same author

Elucidating Electronic Coupling of Bimolecular Excited State Electron Transfer.

Journal of the American Chemical Society·2025

Related Experiment Video

Updated: Apr 22, 2026

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures
09:16

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Published on: November 7, 2016

13.7K

Temperature dependent iodide oxidation by MLCT excited states.

Atefeh Taheri1, Gerald J Meyer

  • 1Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.

Dalton Transactions (Cambridge, England : 2003)
|October 14, 2014
PubMed
Summary

This study characterizes metal-to-ligand charge transfer excited states in ruthenium(II) compounds using photoluminescence and iodide quenching. Electron transfer from iodide to the excited states is an activated process, increasing with temperature.

More Related Videos

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
09:54

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Published on: September 12, 2018

7.0K
Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

1.9K

Related Experiment Videos

Last Updated: Apr 22, 2026

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures
09:16

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Published on: November 7, 2016

13.7K
Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
09:54

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Published on: September 12, 2018

7.0K
Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

1.9K

Area of Science:

  • Photochemistry and Photophysics
  • Coordination Chemistry
  • Ruthenium(II) Complexes

Background:

  • Metal-to-ligand charge transfer (MLCT) excited states are crucial for photophysical processes in transition metal complexes.
  • Understanding the dynamics of these excited states, including energy transfer and electron transfer pathways, is essential for designing functional materials.
  • Heteroleptic ruthenium(II) complexes with bipyridine and biquinoline ligands offer tunable photophysical properties.

Purpose of the Study:

  • To characterize the MLCT excited states of two related heteroleptic Ru(II) compounds: [Ru(bpy)2(deeb)](2+) and [Ru(bpy)2(deebq)](2+).
  • To investigate the temperature-dependent photoluminescence and excited state dynamics, including internal conversion and electron transfer.
  • To elucidate the mechanism of iodide quenching and determine the activation energies for electron transfer.

Main Methods:

  • Temperature-dependent photoluminescence spectroscopy in acetonitrile.
  • Quenching studies using iodide ions and analysis via the Stern-Volmer model.
  • Transient absorption spectroscopy to probe reaction mechanisms.
  • Arrhenius analysis of temperature-dependent lifetime and electron transfer rate data.

Main Results:

  • Photoluminescence originates from thermally equilibrated 'thexi' states, with evidence for activated internal conversion to a fourth MLCT state.
  • Activation energies for internal conversion were determined as 550 cm⁻¹ for [Ru(bpy)2(deeb)](2+)* and 1200 cm⁻¹ for [Ru(bpy)2(deebq)](2+)*.
  • Iodide quenching occurs via dynamic electron transfer, an activated process with activation energies of 2400 cm⁻¹ and 3300 cm⁻¹ for the respective complexes, increasing with temperature.

Conclusions:

  • The study provides detailed insights into the excited state dynamics and electron transfer mechanisms of the investigated Ru(II) complexes.
  • Electron transfer from iodide to the Ru(II) excited states is confirmed as an activated process, influenced by temperature.
  • The findings contribute to the fundamental understanding of photophysical processes in MLCT complexes, relevant for applications in catalysis and light-harvesting.