期刊
CHEMPHYSCHEM
卷 17, 期 20, 页码 3283-3288出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201600627
关键词
circular dichroism; heterogeneous solutions; imaging; self-catalysis; UV; Vis spectroscopy
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [15H00981]
- Uehara Memorial Foundation
- JSPS [257424]
- Grants-in-Aid for Scientific Research [15H00981, 15K18825] Funding Source: KAKEN
A 1:1 mixture of pseudoenantiomeric aminomethylenehelicene oligomers, (P)-tetramer and (M)-pentamer, in fluorobenzene show a self-catalytic phenomenon in the formation of hetero-double helices from random coils. This study visualizes the spatially heterogeneous nature of the self-catalytic reaction in dilute solution. UV/Vis imaging analysis of the mixture at 70 degrees C, containing random coils, exhibits a homogeneous bright area. When the solution is cooled from 70 to 30 degrees C and held at that temperature, dark domains of approximately 1mm in size appear, which move approximately at a rate of 1mmmin(-1). The dark domains indicate that weaker UV/Vis absorption results from the formation of hetero-double helices, which is supported by circular dichroism (CD) imaging experiments. Then a homogeneous mixture is regenerated upon heating to 55 degrees C, as shown by CD imaging. Under self-catalytic conditions, a homogeneous solution spontaneously changed to a heterogeneous solution in the process of hetero-double-helix formation.
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