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Updated: Feb 15, 2026

Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
Salt Cluster Attachment to Crown Ether Decorated Phthalocyanines in the Gas Phase
Ina D Kellner1, Uwe Hahn2, Tomás Torres2,3,4
1Physical Chemistry I, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg , Egerlandstraße 3, 91058 Erlangen, Germany.
Abstract:
Crown ether decorated phthalocyanines were designed to form rigidly eclipsed aggregates with metal ions being sandwiched between the molecules. We studied tetra-[18]crown-6 ether functionalized zinc phthalocyanine (ZnPcTetCr) in the presence of excess NaCl by electrospray ionization mass spectrometry. ZnPcTetCr was found to form aggregates in the gas phase to which several neutral NaCl molecules are attached. Collision-induced dissociation experiments revealed that the ions observed in the positive- and negative-ion modes possess remarkably different structures. Their fragmentation behavior indicates that the sodium ions providing the charge of the positively charged aggregates are strongly bound inside the crown ether moieties, while the neutral salt units are less strongly attached. However, in the negatively charged ions, none of the sodium ions is embedded in the crown ether moieties, and the NaCl molecules were found to be attached as one large, weakly bound cluster.
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