期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 41, 页码 12634-12638出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201707392
关键词
circular dichroism; chirality; helical structures; pi-systems; self-assembly
资金
- DST-SERB, Govt. of India [SB/S2/JCB-11/2014]
- CSIR, Govt. of India
- DST
- DST-SERB
Higher-order super-helical structures derived from biological molecules are known to evolve through opposite coiling of the initial helical fibers, as seen in collagen protein. A similar phenomenon is observed in a -system self-assembly of chiral oligo(phenyleneethylene) derivatives (S)-1 and (R)-1 that explains the unequal formation of both left- and right-handed helices from molecule having a specific chiral center. Concentration- and temperature-dependent circular dichroism (CD) and UV/Vis spectroscopic studies revealed that the initial formation of helical aggregates is in accordance with the molecular chirality. At the next level of hierarchical self-assembly, coiling of the fibers occurs with opposite handedness, thereby superseding the command of the molecular chirality. This was confirmed by solvent-dependent decoiling of super-helical structures and concentration-dependent morphological analysis.
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