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New complexes of liquid crystal discotic triphenylenes: induction of the double gyroid phaseстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Otmakhova O.A., Piryazev A.A., Bondarenko G.N., Shandryuk G.A., Maryasevskaya A.V., Merekalov A.S., Ivanov D.A., Talroze R.V.
- Журнал: Physical Chemistry Chemical Physics
- Год издания: 2021
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/D1CP00660F
- Аннотация: Electron donor-acceptor liquid crystals have been attracting considerable attention due to possible applications inoptoelectronics and photonics. The creation of such charge transfer complexes is a powerful and flexible instrument formodifying the structures and properties compared to those of the initial components. In the present work, such anapproach is exemplified on new complexes formed via non-covalent interactions of triphenylene discotics, namely,2,3,6,7,10,11 – hexakis(pentyloxy) triphenylene (H5T) and 2-(acryloyloxypropyloxy)-3,6,7,10,11- pentapentyloxtriphenylene (TPh-3A), with an electron acceptor, β- (2,4,7-trinitro-9-fluorenylideneaminooxy) propionic acid (TNF-carb).The structure of thin supported films of H5T, TPh-3A and their blends with TNF-carb was investigated by grazing-incidencewide-angle X-ray scattering using a synchrotron source. At room temperature, the pristine discotics crystallize inorthorhombic unit cells whereas the self-assembly of H5T and TPh-3A with TNF-carb results in a double gyroid andhexagonal phases, respectively. Formation of the double gyroid phase with the lattice parameter of 36.5 Å is driven byphase separation between the aromatic and alkyl regions of the system. It is supposed that the TNF-carb molecules of thecomplex are positioned in the nodes of the structure while the H5T molecules are located in the struts adjoining the nodesvia triple junctions. For the hexagonal crystal of the TPh-3A /TNF-carb complex, the acceptor molecules are likely locatedin the intersticies between the neighboring supramolecular columns of TPh-3A. The molecular structures of the blendswere also explored by means of FTIR spectroscopy. A detailed FTIR spectra analysis illustrates fine changes in intermolecular bonds. For example, the initially dimerized acceptor molecules totally disappear in the complex structureswhereas in TPh-3A/TNF-carb additional H-bonds between the carboxylate group in TNF-carb and the ester group of TPh-3Aform. The experimental data allows putting forward possible molecular models of the complex structures.
- Добавил в систему: Иванов Дмитрий Анатольевич