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Updated: Jun 7, 2025

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Transition Metal Ions in Solution: Complexed Ion Speciation at the Air-Liquid Interface
Theis I So Lling1, Martin P Andersson1, Safwat Abdel-Azeim1
1Center for Integrative Petroleum Research, College of Petroleum & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Zinc ions (Zn2+) exhibit unique interfacial behavior in water-ethanol mixtures compared to other transition metals. This is due to their specific electronic configuration and atomic size, leading to distinct speciation at the air-liquid interface.
Area of Science:
- Physical Chemistry
- Surface Science
- Ion Spectroscopy
Background:
- Understanding ion behavior at interfaces is crucial for various chemical and biological processes.
- Previous observations suggested unique surface activity for Zn2+ ions.
Purpose of the Study:
- To investigate and clarify the root cause of specific surface activity of Zn2+.
- To compare the interfacial properties of Zn2+ with other transition metal cations (Fe2+, Cu2+, Cr3+).
Main Methods:
- Field-induced droplet ionization technique was employed.
- Analysis of interfacial properties in a water-ethanol mixture.
Main Results:
- Zn2+ demonstrated specific speciation at the air-liquid interface, unlike other studied transition metal ions.
- Three ethanol molecules were observed to attach to the central Zn2+ atom, optimizing polarity.
Conclusions:
- The unique electronic configuration and atomic size of Zn2+ are responsible for its distinct interfacial behavior.
- Zn2+ exhibits specific solvation and orientation at the air-liquid interface in this mixture.
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