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Mass spectra for complex Eu–1: a) ESI mass spectrum; b) simulated and experimentally observed isotope pattern for [Eu–1(OTf)14]4+; and c) IM–MS data for three Eu–1 cations. For each ion, one TWCCSN2 distribution from one data set was fitted to a Gaussian distribution. The ionic diameter calculated from the TWCCSN2 measurement is consistent with modelling and DOSY experimental data.
