On March 31, 2022, Percec, Virgil; Huang, Ning; Xiao, Qi; Partridge, Benjamin E.; Sahoo, Dipankar; Imam, Mohammad R.; Peterca, Mihai; Graf, Robert; Spiess, Hans-Wolfgang; Zeng, Xiangbing; Ungar, Goran published an article.HPLC of Formula: 91-16-7 The title of the article was Self-organization of rectangular bipyramidal helical columns by supramolecular orientational memory epitaxially nucleated from a Frank-Kasper σ phase. And the article contained the following:
Programming living and soft complex matter via primary structure and self-organization represents the key methodol. employed to design functions in biol. and synthetic nanoscience. Memory effects have been used to create com. technologies including liquid crystal displays and biomedical applications based on shape memory polymers. Supramol. orientational memory (SOM), induced by an epitaxial nucleation mediated by the close contact spheres of cubic phases, emerged as a pathway to engineer complex nanoscale soft matter of helical columnar hexagonal arrays. SOM preserves the crystallog. directions of close contact supramol. spheres from the 3D phase upon cooling to the columnar hexagonal periodic array. Despite the diversity of 3D periodic and quasiperiodic nanoarrays of supramol. dendrimers, including Frank-Kasper and quasicrystal, all examples of SOM to date were mediated by Im3m (body-centered cubic, BCC) and Pm3n (Frank-Kasper A15) cubic phases. Expanding the scope of SOM to non-cubic arrays is expected to generate addnl. morphologies that were not yet available by any other methods. Here we demonstrate the SOM of a dendronized triphenylene that self-organizes into helical columnar hexagonal and tetragonal P42/mnm (Frank-Kasper σ) phases. Structural anal. of oriented fibers by X-ray diffraction reveals that helical columnar hexagonal domains self-organize an unusual rectangular bipyramidal morphol. upon cooling from the σ phase. The discovery of SOM in a non-cubic Frank-Kasper phase indicates that this methodol. may be expanded to other periodic and quasiperiodic nanoarrays organized from self-assembling dendrimers and, most probably, to other soft and living complex matter. The experimental process involved the reaction of 1,2-Dimethoxybenzene(cas: 91-16-7).HPLC of Formula: 91-16-7
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