TY - JOUR A1 - Spitz, Christian A1 - Dähne, Siegfried A1 - Quart, A. A1 - Abraham, H.-W. T1 - Proof of chirality of J-Aggregates spontaneously and enantioselectively generated from achiral dyes JF - The journal of physical chemistry / B N2 - The recently published claim1,2 that the achiral 5,5',6,6'- tetrachlorobenzimidacarbocyanine chromophore spontaneously and enantioselectively generates chiral J-aggregates when it is substituted in the 1,1'-position with n-alkyl groups longer than hexyl and in the 3,3'-position with -acido-ethyl or -acido-n-propyl groups has been proved by embedding the J-aggregates of such a dye (1a) in a polymeric PVA film and measuring the CD signal at defined observation angles. Dye 1b, which is assumed to give achiral J-aggregates, has been investigated for comparison as well. Possible contibutions of linear dichroism and birefringence of ordered molecules to the measured CD signal have been excluded by careful checks using both a plain PVA film and a film containing monomers of a dye (2) of known chirality. PY - 2000 DO - https://doi.org/10.1021/jp001805w SN - 1520-6106 SN - 1520-5207 SN - 1089-5647 VL - 104 IS - 36 SP - 8664 EP - 8669 PB - Soc. CY - Washington, DC AN - OPUS4-864 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -