Related Experiment Video
Updated: Sep 11, 2025
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Synthesis, structure and slow magnetic relaxation of lanthanoid coordination polymers based on ethynyl-bridged
Verónica Jornet-Mollá1, Carlos J Gómez-García1, Miquel J Dolz-Lozano1
1Departament de Química Inorgànica, Universitat de València, C/Dr Moliner, 50, 46100 Burjassot, Spain. fmrm@uv.es.
Abstract:
A heteroditopic ligand (H2L1) containing picolinate and benzoate moieties segmented by a triple bond has been used in the preparation of a family of isostructural coordination polymers of the formula [(CH3)2NH2][Ln((H2O)2L1)2] (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5) and Er (6)). The single crystal structures show that these compounds crystallize in the monoclinic I2/a space group and form anionic layers with rhomboidal voids. AC magnetic susceptibility measurements show that compounds based on Kramers ions, such as the Gd (2), Dy (4) and Er (6) derivatives, present slow relaxation of magnetization (SRM) under an applied DC magnetic field. On the other hand, Tb (3) and Ho (5) compounds, based on non-Kramers ions, lack SRM properties. Compound 2 is one of the few reported Gd(III) compounds showing slow relaxation behaviour.
More Related Videos
07:24Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
09:38Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
Published on: January 3, 2018
Related Concept Videos
02:42Valence Bond Theory
02:51Metal-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...
03:02Colors 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...
02:34Structural 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...
02:58Crystal 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...
02:54Coordination Compounds and Nomenclature