Abstract
The K+ adducts of the crown ether–[60]fullerene conjugate of the form (12cr4 – H)–C60–H are investigated by electrospray mass spectrometry (ESI-MS), focusing on the dimeric species produced from two different solvent mixtures. A singly bonded fullerene dimer of the type (12cr4 – H)–C60–C60–(12cr4 – H)K+ is generated in aprotic solvents, while in protic solvents, a metal-bridged, noncovalently bound dimer predominates. The dimerization reaction is proposed to occur during the ESI process via the radical intermediate (12cr4 – H)–C60•. The fragmentation behavior of the different dimers is studied by collision-induced dissociation (CID), showing characteristic product ions for each species.
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