Enantioselective Absorption of Chirally Doped Liquid Crystalline Networks Studied by the Use of an Electronic Microbalance

Abstract

A polydomain cholesteric elastomer was obtained by cross-linking a nematic side-chain polysiloxane in the presence of a chiral dopant. After extraction of the chiral dopant, sorption experiments were performed, by the use of an electronic microbalance, in the presence of each enantiomer of a chiral amine molecule. The sorption kinetics corresponds to a Fickian diffusion behavior. They allowed us to determine the diffusion coefficients and to show that the doped polymer has a more pronounced affinity toward one of the enantiomers.

Molecular imprinting science and technology: a survey of the literature for the years 2004-2011

“…The demonstration of template (or template analog)‐selective recognition by an MIP remains a cornerstone in the development of all new MIP systems. Various strategies have been employed to characterize ligand‐polymer binding events,…”

Sorption Properties of Functionalized Liquid Crystalline Networks

“…Another reference network, RN2, cross-linked with 1,21-docosadiene instead of benzophenone was also studied to compare. It was synthesized as previously described …”

“… a Mol % of substituents x , y , or z linked to the polysiloxane chain; x , y , and z were as defined in Figure 1. b T g : glass transition temperature; N*: cholesteric mesophase; I: isotropic phase. c In that case, 1,21-docosadiene was used as a cross-linking agent; data extracted from ref . …”

“…For these materials, permeabilities mainly depend on the state of the membrane (below or above the glass temperature, in a liquid-crystalline state or not, and so forth) and the structure of the mesogenic groups (spacer length, chemical structure, and so forth). Recently, we have studied the diffusion of a chiral amine molecule into a TLCP network exhibiting a cholesteric phase . The sorption experiments were performed by the use of an electronic microbalance, and the kinetics obtained corresponded to a pure Fickian diffusion behavior.…”

Makromolekulare Chemie 2007

“…Neue Arbeiten zu flüssigkristallinen Elastomeren untersuchten die enantioselektive Absorption kleiner Moleküle in vernetzten nematischen Phasen mit permanenter cholesterischer Chiralität,58 sowie die Einführung chiraler oder photoschaltbarer Seitenketten zur Erzeugung einer lichtinduzierten Phasenumwandlung 59. Der Einbau von PS‐Blockcopolmeren mit Poly(methacrylat)‐Segmenten mit azobenzolbasierten Seitenketten in spritzgegossenes Polystyrol führt zu sphärischen photoschaltbaren Domänen, die in holographischen Anwendungen untersucht wurden 60…”