Abstract
By using electrospray ionization mass spectrometry (ESI-MS), it was proven experimentally that the univalent thallium cation forms with [6]helicene (C26H16) the cationic complex species [Tl(C26H16)]+ in the gas phase. Further, applying quantum mechanical DFT calculations, the most probable structure of the [Tl(C26H16)]+ complex was derived. In the resulting complex, the “central” cation Tl+ is bound by six bonds to six carbon atoms from the two terminal benzene rings of the parent [6]helicene ligand via cation-π interaction. Finally, the interaction energy, E(int), of the considered cation-π complex [Tl(C26H16)]+ was found to be −144.8 kJ/mol, confirming the formation of this cationic complex species as well.
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