Related Experiment Video
Updated: May 28, 2025
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
2.2K
Ferromagnetically coupled tetranuclear Ni(ii)-2-oxy-aceto- or benzo-phenonate complexes
Imdadul Haque1, Mohammed Enamullah1, Nisat Taslum Jhumur1
1Department of Chemistry, Jahangirnagar University Dhaka-1342 Bangladesh enamullah@juniv.edu.
RSC Advances
|February 10, 2025
Summary
New nickel(II) complexes with acetophenone or benzophenone ligands exhibit a cubane structure. These compounds display ferromagnetic interactions due to their unique topology and bonding, confirmed by magnetic and computational studies.
Area of Science:
- Coordination Chemistry
- Inorganic Materials
- Magnetochemistry
Background:
- Nickel(II) complexes are widely studied for their diverse structural motifs and magnetic properties.
- Acetophenone and benzophenone derivatives serve as versatile ligands in coordination chemistry.
- Cubane-type structures in metal complexes often lead to interesting magnetic phenomena.
Purpose of the Study:
- To synthesize and characterize novel nickel(II) complexes with 2-hydroxy-acetophenone and 2-hydroxy-benzophenone ligands.
- To elucidate the molecular structure, focusing on the cubane-type topology and coordination environment.
- To investigate the magnetic properties and thermal stability of the synthesized nickel(II) complexes.
Main Methods:
- Synthesis of nickel(II) complexes using nickel(II) acetate and the respective ligands.
- Single-crystal X-ray diffraction for molecular structure determination.
- Solid-state magnetic susceptibility measurements and computational modeling.
- Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
- Cyclic voltammetry for electrochemical studies.
Main Results:
- Formation of tetranuclear nickel(II) complexes with a cubane-type structure ([Ni(L)(μ3-CH3O)(CH3OH)]4 and [Ni(L')(μ3-CH3O)(H2O)]4·H2O).
- Each nickel(II) ion exhibits a six-coordinate distorted octahedral geometry.
- Dominant ferromagnetic interactions were confirmed, attributed to the cubane topology and specific Ni-O-Ni angles (<100°).
- Thermal analysis revealed sequential decomposition of solvent molecules, methoxide groups, and ligands.
- Cyclic voltammetry indicated a quasi-reversible two-electron transfer process.
Conclusions:
- The study successfully synthesized and characterized novel nickel(II) cubane complexes.
- The ferromagnetic interactions observed are strongly linked to the unique structural arrangement and bonding.
- The complexes demonstrate characteristic thermal decomposition pathways and electrochemical behavior.
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