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

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Colors and Magnetism03:02

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.
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

You might also read

Related Articles

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

Sort by
Same author

All-metal aromaticity of cyclo-Bi<sub>3</sub><sup>3-</sup> in diuranium and dithorium inverse-sandwich-type complexes.

Nature chemistry·2026
Same author

Yb<sub>2</sub>-Tb Upconversion in a Hetero-Trimetallic Molecular Lanthanide Complex.

Angewandte Chemie (International ed. in English)·2026
Same author

Activation of alcohols as sulfonium salts in the photocatalytic hetero-difunctionalization of alkenes.

Nature chemistry·2025
Same author

Optimisation of an nIR-Emitting Benzoporphyrin Pressure-Sensitive Paint Formulation.

Sensors (Basel, Switzerland)·2025
Same author

A Water Stable U(IV) Complex Based on a Macrocyclic Ligand Displaying NIR Emission.

Chemistry (Weinheim an der Bergstrasse, Germany)·2025
Same author

Photocatalytic Synthesis of Hydrogen Peroxide by Rhenium Modified Metal-Organic Frameworks Incorporating Bianthracene Ligands.

Journal of the American Chemical Society·2025

Related Experiment Video

Updated: May 18, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
07:24

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

The first structural and spectroscopic study of a paramagnetic 5f DO3A complex.

Louise S Natrajan1

  • 1School of Chemistry, University of Manchester, Manchester, UK. louise.natrajan@manchester.ac.uk

Dalton Transactions (Cambridge, England : 2003)
|September 27, 2012
PubMed
Summary

Researchers developed a uranium(IV) complex with the macrocycle DO3A. This study shows detectable UV-visible emission from simple uranium chelates, useful for environmental U(IV) detection.

More Related Videos

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Related Experiment Videos

Last Updated: May 18, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
07:24

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Area of Science:

  • Inorganic Chemistry
  • Radiochemistry
  • Photochemistry

Background:

  • Uranium(IV) complexes are of interest due to their unique electronic properties.
  • Luminescence detection of uranium species often requires sensitizing "antenna" molecules.
  • The development of direct luminescence detection methods for U(IV) is challenging.

Purpose of the Study:

  • To synthesize and characterize a uranium(IV) complex with the macrocycle DO3A.
  • To investigate the luminescence properties of this U(IV)-DO3A complex.
  • To explore the potential of direct U(IV) luminescence for environmental monitoring.

Main Methods:

  • Synthesis of a uranium(IV) complex with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DO3A).
  • Characterization of the complex in solid-state and solution using spectroscopic techniques.
  • Measurement of UV-visible emission lifetimes and spectral properties.

Main Results:

  • A 5f(2) uranium(IV) complex with DO3A was successfully prepared and characterized.
  • The U(IV)-DO3A complex exhibits relatively long-lived (8-13 ns) UV-visible emission.
  • The observed luminescence possesses charge transfer character, attributed to the excited electronic configuration.

Conclusions:

  • Luminescence from simple U(IV) chelates is detectable without an antenna, a novel finding.
  • This direct luminescence detection method could serve as a diagnostic tool for environmental U(IV) species.
  • The study opens new avenues for the detection and study of uranium in various environments.