Assembly and Disassembly of Langmuir−Blodgett Films on Poly[1-(trimethylsilyl)-1-propyne]: The Uniqueness of Calix[6]arene Multilayers as Permeation-Selective Membranes
作者:Robert A. Hendel、Eisaku Nomura、Vaclav Janout、Steven L. Regen
DOI:10.1021/ja970980w
日期:1997.7.1
fabricated from Langmuir−Blodgett (LB) multilayers derived from each surfactant plus poly[1-(trimethylsilyl)-1-propyne] (PTMSP) cast film showed a significant increase in their selectivity toward helium and nitrogen, relative to bare PTMSP. In sharp contrast, analogous composites that were prepared with LB multilayers of conventional single chain surfactants [arachidicacid (AA), cadmiumarachidate (AA/Cd2+)
Porous surfactants from cone conformers of calix[5]arenes
作者:Petr Dedek、Vaclav Janout、Steven L. Regen
DOI:10.1021/jo00076a009
日期:1993.11
This paper describes the synthesis and monolayer properties of two porous surfactants derived from the calix[5]arene framework that exist as stable cone conformers [i.e., 5,11,17,23,29-pentaformyl-31,32,33,34,35-pentakis(n-octyloxy)calix[5]arene (1a) and an N,N-dimethylthioamide derivative 2a] plus calix[4]arene and calix[6]arene analogs. The introduction of 1a, in and of itself, represents a significant advance in the calixarene area because it provides access to a wide-cavity calixarene that is amenable for further modification at its wider rim.