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首页> 外文期刊>Chemistry: A European journal >Helicene-Grafted Silica Nanoparticles Capture Hetero-Double-Helix Intermediates during Self-Assembly Gelation
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Helicene-Grafted Silica Nanoparticles Capture Hetero-Double-Helix Intermediates during Self-Assembly Gelation

机译：自组装胶化过程中，Helene接枝的二氧化硅纳米颗粒捕获杂双螺旋中间体。

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摘要

A mixture of a pseudoenantiomeric ethynylhelicene (M)-tetramer and a (P)-pentamer forms a hetero-double-helix in a solution, which self-assembles and gelates solvents. When gelation was conducted in the presence of chiral silica (P)-nanoparticles grafted with (P)-helicene, the resulting hetero-double-helix intermediate was adsorbed on the (P)-nanoparticles, and was removed from the solution by aggregation and precipitation. The resulting precipitates contained only the hetero-double-helix, not random coil or clusters of the hetero-double-helix. (P)-Nanoparticles did not extract the hetero-double-helix from the self-assembly gels. The hetero-double-helix was then isolated by liberating it from the precipitates in 2-bromopropionic acid, and was crystallized from the solution. The crystalline hetero-double-helices were isolated for several other combinations of pseudoenantiomeric ethynylhelicene oligomers.
机译：假对映异构体乙炔基（M）-四聚体和（P）-五聚体的混合物在溶液中形成杂双螺旋，使溶剂自组装并凝胶化。当在接枝有（P）-螺旋烯的手性二氧化硅（P）-纳米颗粒的存在下进行凝胶化时，所得的杂双螺旋中间体被吸附在（P）-纳米颗粒上，并通过聚集和分离从溶液中除去。沉淀。所得沉淀仅包含杂双螺旋，而不包含无规卷曲或杂双螺旋簇。 （P）-纳米颗粒没有从自组装凝胶中提取杂双螺旋。然后通过从2-溴丙酸中的沉淀物中释放出来来分离杂双螺旋，并从溶液中结晶。分离出结晶的杂双螺旋，用于假对映异构体乙炔基螺旋烯低聚物的其他几种组合。

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