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Trityl-Based Lanthanide-Supramolecular Assemblies Exhibiting Slow Magnetic Relaxation
Dawid Marcinkowski1, Maciej Kubicki1, Violetta Patroniak1
1Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 6, 2023
Summary
The triphenylmethane (trityl) group enhances single-molecule magnet (SMM) properties in lanthanide complexes. This study shows trityl-based ligands create SMMs, including zero-field dysprosium complexes, advancing molecular magnetism.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Magnetism
Background:
- The triphenylmethane (trityl) group is a known supramolecular synthon.
- Its application in molecular magnetic materials, specifically single-molecule magnets (SMMs), is unexplored.
- Lanthanide complexes are promising candidates for SMMs.
Purpose of the Study:
- To investigate the utility of the trityl group in shaping SMM properties of lanthanide complexes.
- To synthesize and characterize novel trityl-appended ligands and their lanthanide complexes.
- To explore the magneto-structural correlations in these new materials.
Main Methods:
- Synthesis of trityl-appended mono- and bis-compartmental hydrazone ligands (HL 1 and HL 2 ).
- Complexation of ligands with Dy(III) and Er(III) triflate and nitrate salts.
- Investigation of static and dynamic magnetic properties using various techniques.
- Theoretical ab initio studies for determining energy levels and relaxation mechanisms.
Main Results:
- Four monometallic (1-4) and two bimetallic (5, 6) complexes were synthesized.
- Ligand HL 1 induced SMM behavior in complexes 1-4.
- Dy(III) congeners (1, 2) exhibited SMM behavior under zero-field conditions.
- Magnetic relaxation mechanisms were identified as a combination of Raman and quantum tunneling.
Conclusions:
- The trityl group can be effectively utilized to engineer SMM properties in lanthanide complexes.
- This work establishes the first magneto-structural correlations in trityl-containing lanthanide SMMs.
- Slowly relaxing zero-field dysprosium complexes were generated within hydrogen-bonded assemblies.
Keywords:
lanthanidessingle ion magnetsslow magnetic relaxationsupramolecular complexestrityl-embracesMore Related Videos
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