Induction and reversal of chirality of heterohelicene by charge transfer interaction in aqueous SDS micelles

2-Hydroxymethylthieno[3,2-e∶4,5-e′ ]di[1]benzothiophene and 2-(2,4,5,7-tetranitrofluoren-9-ylideneaminooxy)propionic acid in SDS micelles initially formed a 1∶2 complex with a negative Cotton effect around 360 nm, which with time or sonication gradually changed to a 1∶1 complex giving a reversed Cotton effect.