1H NMR spectroscopic studies of the conformational isomers of pyrrolidinofullerenes.
Mixed bis-adduct derivatives of C60 containing a pyrrolidine and a malonate methano group were synthesized. Three regioisomers, the e', the trans-2, and the trans-3, were isolated and characterized. In-depth NMR studies of these methano-pyrrolidinofullerenes showed that the nitrogen inversion on the pyrrolidine moiety is not a fast event in the 1H NMR time scale as previously regarded. Solvent effects, variable temperature experiments, and protonation of the pyrrolidine nitrogen are addressed.
Lukoyanova
Olena
O
Department of Chemistry, Clemson University, 219 Hunter Laboratories, Clemson, SC 29630-0973, USA.
Kitaygorodskiy
Alex
A
Cardona
Claudia M
CM
Echegoyen
Luis
L