Polyphilic hydrogen bonded block molecules involving semiperfluorinated and silylated molecular fragments
| Autor: | Marko Prehm, Dietmar Janietz, Carsten Tschierske, Laura Vogel |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2017 |
| Předmět: |
Hydrogen
Stereochemistry Substituent chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Block (periodic table) 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Crystallography chemistry Molecule Hexagonal lattice 0210 nano-technology Triazine |
| Zdroj: | Soft Matter. 13:7188-7196 |
| ISSN: | 1744-6848 1744-683X |
| Popis: | 2,4-Diamino-6-phenyl-1,3,5-triazines grafted with one or two semiperfluorinated chains at the phenyl substituent have been investigated in binary mixtures with one-chain and two-chain oligo(dimethylsiloxy) terminated 4-alkoxy- and 3,4-dialkoxybenzoic acids. Equimolar mixtures of the triazines with the complementary acids form discrete double hydrogen-bonded heterodimers with an elongated central core. Mesomorphic properties are observed only if at least two terminal fluoroalkyl chains are attached to the triazine entity. Three to four heterodimers generate aggregates with preferably parallel adjusted rod-like H-bonded cores. The space requirement of the segregated peripheral fluoroalkyl and oligosiloxane segments considerably exceeds that of the central core region, leading to an overall circular geometry of the associates which organize in columnar LC phases. The chains initiate a local segregation which is however not long range and retains a time and space averaged two-dimensional hexagonal lattice. |
| Databáze: | OpenAIRE |
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