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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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[CrIII8NiII6]n+ Heterometallic Coordination Cubes
Helen M O'Connor1, Sergio Sanz1, Aaron J Scott1
1EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh EH3 5JF, UK.
Molecules (Basel, Switzerland)
|February 5, 2021
Summary
Researchers synthesized new heterometallic coordination cubes containing chromium (CrIII) and nickel (NiII) ions. These magnetic clusters exhibit weak ferromagnetic interactions, expanding the library of complex polymetallic structures.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Magnetochemistry
Background:
- Large heterometallic clusters containing both chromium (CrIII) and nickel (NiII) ions are rare, particularly excluding wheel-like structures.
- The modular synthesis of polymetallic complexes relies on metalloligands with predictable coordination behavior.
Purpose of the Study:
- To synthesize novel heterometallic coordination cubes with a [CrIII8NiII6] stoichiometry.
- To investigate the magnetic properties and structural characteristics of these new clusters.
- To demonstrate a modular approach for constructing related polymetallic complexes.
Main Methods:
- Synthesis of three new heterometallic coordination cubes: [CrIII8NiII6L24(H2O)12](NO3)12 (1), [CrIII8NiII6L24(MeCN)7(H2O)5](ClO4)12 (2), and [CrIII8NiII6L24Cl12] (3), using a paramagnetic CrIII metalloligand and NiII salts.
- Characterization of the magnetic skeleton as a face-centred cube with CrIII at vertices and NiII at faces.
- Direct current magnetic susceptibility measurements to probe magnetic interactions.
- Electron Paramagnetic Resonance (EPR) spectroscopy to study electronic properties.
Main Results:
- Successful synthesis of three novel [CrIII8NiII6] coordination cubes.
- Magnetic susceptibility data for compound 1 revealed weak ferromagnetic interactions between CrIII and NiII ions (JCr-Ni = +0.045 cm-1).
- EPR spectra indicated weak exchange coupling, primarily influenced by the zero-field splitting of CrIII ions.
Conclusions:
- The study successfully expands the family of [MIII8MII6] coordination cubes.
- The use of metalloligands provides a versatile and modular strategy for constructing complex heterometallic clusters.
- These findings contribute to the understanding of magnetic interactions in polynuclear transition metal complexes.
Keywords:
EPR spectroscopyheterometallic clustersmagnetometrymolecular magnetismsupramolecular chemistryMore Related Videos
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