Mmm—stacks of donuts! A one-dimensional n-type nanotube was formed by stacking rings formed from the bolaamphiphilic self-assembly of 1,4,5,8-naphthalenetetracarboxylic acid diimide (NDI) with L-lysine headgroups (see picture). Solid-state NMR studies demonstrate the exceptional conformational homogeneity of the constituent molecules that make up the nanotubes.
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Shao et al. (2010) studied this question.