Related Experiment Video
Updated: May 12, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
Published on: February 5, 2022
Molecular amino-phosphonate cobalt-lanthanide clusters.
Eufemio Moreno Pineda1, Floriana Tuna, Robin G Pritchard
1School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Researchers synthesized novel 3d-4f phosphonate cages using 1-amino-1-cyclohexyl phosphonic acid. These unique structures exhibit significant magnetocaloric effects, indicating potential for advanced magnetic applications.
Area of Science:
- Coordination Chemistry
- Materials Science
- Magnetism
Background:
- Phosphonate cages are of interest for their unique structural properties.
- 3d-4f metal complexes offer tunable magnetic behaviors.
- Magnetocaloric effects are crucial for cooling technologies.
Purpose of the Study:
- To synthesize novel 3d-4f phosphonate cage compounds.
- To investigate the structural diversity of these new materials.
- To evaluate their magnetocaloric properties.
Main Methods:
- Utilizing 1-amino-1-cyclohexyl phosphonic acid as a functionalized ligand.
- Employing solvothermal synthesis techniques.
- Characterizing the crystal structures of the resulting phosphonate cages.
Main Results:
- Successfully synthesized two new structural types of 3d-4f phosphonate cages.
- These cages possess unusual and complex structural cores.
- The synthesized materials demonstrate high magnetocaloric effects.
Conclusions:
- 1-amino-1-cyclohexyl phosphonic acid is effective for creating novel 3d-4f phosphonate cages.
- The discovered structures exhibit promising high magnetocaloric properties.
- These findings open avenues for developing new magnetic refrigerants.
Related Concept Videos
Valence Bond Theory
Colors and Magnetism
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.
Metal-Ligand Bonds
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...
Crystal Field Theory - Octahedral Complexes
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...
Coordination Compounds and Nomenclature
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...

