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Gas-phase metal trications in protic solvent complexes.

Alexandre A Shvartsburg¹

¹Division of Chemistry, National Center for Toxicological Research, HFT-233, 3900 NCTR Road, Jefferson, Arkansas 72079, USA. ashvartsburg@nctr.fda.gov

Journal of the American Chemical Society

|July 4, 2002

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This study reports the first observation of triply charged metal ions interacting with diacetone alcohol. These metal-ligand complexes are larger than previously known multiply charged ion clusters.

Area of Science:

Physical Chemistry
Inorganic Chemistry
Mass Spectrometry

Background:

Multiply charged metal ions are crucial in various chemical processes.
Understanding their solvation is key to controlling reactivity.
Previous studies were limited to smaller multiply charged ion-ligand complexes.

Purpose of the Study:

To investigate the microsolvation of triply charged metal ions (trications) by protic ligands.
To determine the minimum size of stable multiply charged metal cation/ligand complexes.
To explore charge reduction mechanisms in these complexes.

Main Methods:

Electrospray ionization (ESI) was used to generate gas-phase complexes.
Eleven different metal trications were studied with diacetone alcohol as the protic ligand.

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Complex stability and charge reduction were analyzed based on ligand number.

Main Results:

Stable gas-phase complexes of 11 metal trications with diacetone alcohol were successfully generated.
Complexes persisted with at least five to eight ligands, varying by metal.
Charge reduction to dications occurred spontaneously for smaller complexes via proton transfer.
This represents the largest minimum size reported for multiply charged metal cation/ligand pairs.

Conclusions:

Triply charged metal ions can be significantly microsolvated by protic ligands like diacetone alcohol.
The observed stability and charge reduction provide insights into ion-ligand interactions.
This work expands the known size limits for multiply charged ion solvation complexes.