학술논문
Ethenylene-Bridged Periodic Mesoporous Organosilicas: From Eto Z.
Document Type
Article
Author
Source
Subject
*MESOPOROUS materials
*ORGANOSILICON compounds
*BLOCK copolymers
*MOLECULAR structure
*DIASTEREOISOMERS
*SOLID state chemistry
*NUCLEAR magnetic resonance spectroscopy
*
*
*
*
*
*
Language
ISSN
0897-4756
Abstract
A novel class of periodic mesoporous organosilicas with E- and/or Z-configured ethenylene bridges was prepared under acidic conditions using the triblock copolymer Pluronic P123 as a structure directing agent. The isomeric configuration of the precursor has a drastic effect on the properties of the resulting PMO materials. The diastereoisomerically pure E-configured ethenylene bridged PMOs reveal higher structural ordering, narrower pore size distributions, and enhanced hydrothermal stability than their diastereoisomerically impure counterparts. These properties have been correlated with the molecular level structure of pore walls probed by solid-state NMR spectroscopy. [ABSTRACT FROM AUTHOR]