Synthesis and phosphonate binding of guanidine-functionalized fluorinated amphiphiles
摘要:
We report herein convenient procedures for the use of highly fluorinated alpha,omega-diols (e.g. 1) as building blocks for the rapid assembly of amphiphilic materials containing a fluorous phase region. We describe expedient conversion of the parent diols to both symmetrically and asymmetrically substituted amphiphiles via the installation of an intermediate trifluoromethanesulfonyl ester. These sulfonate esters are versatile and easily manipulated intermediates, which can be readily converted to a variety of nitrogen, halogen, and carbon groups. Moreover, we show that for guanidine-terminated fluorous amphiphiles, these molecules can bind phosphonic acid groups in aqueous media. Thus, these materials offer a new strategy for decorating phosphorylated biomolecules with fluorine-rich coatings. (C) 2012 Published by Elsevier B.V.
A series of new fluorocarbon and hydrocarbonN-heterocyclic (C-5-C-7) difluorooxymethylene-bridged liquidcrystals have been prepared. The impact of ring (C-5-C-7) as end group was investigated. Compounds with terminal N-heterocyclic 5- or 6-membered rings such as 3,4-difluoropyrrole, pyrrolidine, or pyridine, exhibited nematic phases (N). Whereas the terminal 3,3,4,4-tetrafluoropyrrolidine and 3,3
A new class of benzodioxocycloalkane‐based (C8–C10) liquidcrystals were prepared. The impact of ring (C8–C10) as end group was investigated. The 8–9 membered ring derivatives, 3a–3b, exhibited the nematic phases (N). The mesomorphicbehaviors were weakened with increasing the size of the ring. For the ?uorinated medium ring (C8–C10) 3d–3f, it was found only the fluorinated ten membered ring 3f showed
Aggregation-induced emission based on a fluorinated macrocycle: visualizing spontaneous and ultrafast solid-state molecular motions at room temperature <i>via</i> F⋯F interactions
We report the first example of fluorinated macrocycle, where two adjacent 6F-2 macrocycles were linked by two C–F⋯F–C halogen interactions, which endowed the molecule with autonomous and rapid MFC reversibility, within 100 s, at room temperature.
protocols, a series of fluorocarbon and hydrocarbon N‐heterocyclic imidazole‐based liquidcrystals (LCs) and related imidazolium‐based ionic liquidcrystals (ILCs) have been prepared. The ring size of the N‐heterocycle and the length of the N‐terminal chain (on the imidazolium unit in the ILCs) were modified, and the influence of these structural parameters on liquid‐crystal phases was investigated
terminal fluorinated heterocycle. For a comparison, the analogs 5a–5c with an extended fluorinated azepine were also synthesized. The terminal seven-membered 3,3,4,4,5,5,6,6-octafluoroazepane formed an “L” shape. The twisted L configuration significantly impacted the liquid crystal behavior of 5a–5c, resulting from steric hindrance. The structures of 3b were investigated using single crystal X-ray diffraction