jp7b10156_si_001.pdf (4.46 MB)
Salt Cluster Attachment to Crown Ether Decorated Phthalocyanines in the Gas Phase
journal contribution
posted on 2018-01-22, 00:00 authored by Ina D. Kellner, Uwe Hahn, Tomás Torres, Thomas DrewelloCrown 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.