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Issue 32, 2008
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Gas phase hydration of organic ions

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In this work, we study the hydration phenomenon on a molecular level in the gas phase where a selected number of water molecules can interact with the organic ion of interest. The stepwise binding energies (ΔH°n−1,n) of 1–7 water molecules to the phenyl acetylene cation are determined by equilibrium measurements using an ion mobility drift cell. The stepwise hydration energies ΔH°n−1,n are nearly constant at 39.7 ± 6.3 kJ mol−1 from n = 1 to 7. The entropy change is larger in the n = 7 step, suggesting cyclic or cage-like water structures. No water addition is observed on the ionized phenyl acetylene trimer consistent with cyclization of the trimer ion to form triphenyl benzene cations C24H18˙+ which are expected to interact weakly with the water molecules due to steric interactions and the delocalization of the charge on the large organic ion. The work demonstrates that hydration studies of organic ions can provide structural information on the organic ions.

Graphical abstract: Gas phase hydration of organic ions

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Publication details

The article was received on 03 Jun 2008, accepted on 09 Jul 2008 and first published on 23 Jul 2008

Article type: Paper
DOI: 10.1039/B809440N
Citation: Phys. Chem. Chem. Phys., 2008,10, 4827-4834

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    Gas phase hydration of organic ions

    P. O. Momoh and M. S. El-Shall, Phys. Chem. Chem. Phys., 2008, 10, 4827
    DOI: 10.1039/B809440N

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