Cross peaks of the remaining signals in the 1 H 1 H NOESY and 1 H 1 H ROESY experiments showed multiple intermolecular NOE contacts between the cations of SF ® and H-TEDA(BF 4 ) 2 , confirming heterocomplexation (see Figure and SI chapter 5.1). The 1 H 19 F HOESY experiment could not reveal any N + -H•••F-+ N interactions due to fast exchange processes.