The use of prochiral centers for demonstrating asymmetric stacking in aggregates of azulenylazulenium cyanine dyes
[structure: see text]The diastereotopic methyl signals detected at low temperatures or high concentrations of an azulenylazulenium salt containing prochiral centers are consistent only with a model involving monomers in rapid equilibration with dimers in the staggered ("brickwork") arrangement and not in the "card-stacked" arrangement.
Asato
AE
Department of Chemistry, University of Hawaii, Honolulu 96822, USA.
Watanabe
DT
Liu
RS