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Related Concept Videos

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...
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.
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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Related Experiment Video

Updated: May 13, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
09:38

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Double-ligand modulation for engineering magnetic nanoclusters.

Bongjune Kim1, Jaemoon Yang, Eun-Kyung Lim

  • 1Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul, 120-749, Republic of Korea. ymhuh@yuhs.ac.

Nanoscale Research Letters
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Magnetic nanoclusters (MNCs) enhance magnetic resonance imaging (MRI) sensitivity. This study engineered MNCs using double-ligand modulation, significantly improving MRI performance through controlled size and magnetic content.

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic nanoclusters (MNCs), formed from magnetic nanoparticles (MNPs), offer potential for enhanced magnetic resonance imaging (MRI) sensitivity.
  • Current methods for MNC preparation require optimization for improved MRI contrast.
  • Ligand engineering plays a crucial role in controlling nanoparticle assembly and properties.

Purpose of the Study:

  • To develop an effective strategy for engineering MNCs with enhanced MRI sensitivity.
  • To investigate the impact of double-ligand modulation on MNC size, magnetic content, and MRI performance.
  • To establish a nanoemulsion-based method for reproducible MNC synthesis.

Main Methods:

  • Individual oleic acid-coated MNPs were self-assembled.
  • A nanoemulsion method was employed to envelop the self-assembled MNPs with polysorbate 80.
  • The ratio of oleic acid to polysorbate 80 was modulated to control MNC formation.
  • MRI sensitivity of the engineered MNCs was evaluated.

Main Results:

  • The double-ligand modulation strategy successfully produced MNCs with tunable size and magnetic content.
  • Varying ligand concentrations significantly influenced MNC characteristics.
  • The engineered MNCs demonstrated substantially improved MRI sensitivity compared to controls.
  • The nanoemulsion method provided a scalable approach for MNC preparation.

Conclusions:

  • Double-ligand modulation is an effective strategy for engineering MNCs with enhanced MRI sensitivity.
  • Controlling MNC size and magnetic content via ligand engineering is key to improving MRI performance.
  • This approach offers a promising pathway for developing advanced MRI contrast agents.