Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate

TETRAHEDRON

卷:66

Article

Di Chenna, Pablo H.¹ 

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Quim Organ, Buenos Aires, DF, Argentina

关键词: Organogel;    Silica nanotubes;    Template;    Steroid;   

DOI  :  10.1016/j.tet.2010.01.065

来源: Elsevier

【 摘 要 】

In this paper we report the synthesis of a new steroid-based low-molecular weight organogelator, the analysis of the self-assembled fibrilar network (SAFIN) and its use as template for the preparation of SiO(2) nanotubes This novel steroidal organogelator has a unique structure among the well known family of steroid-based organogelators, the most important characteristic of this molecule is the presence of a silyl ether group at C-3 together with a 6 beta,19-oxo bridge It was capable to gelate hydrocarbons and tetraethyl orthosilicate, at very low concentrations (< 1 wt%) An insight into the aggregation mechanism is provided revealing that complementary interaction between an alpha-oriented hydrogen bond donor and a beta-oriented acceptor on the steroid skeleton is the driving force for the primary 1D self-assembly The SAFIN Was Successfully used as template to grow silica nanotubes (external diameter 40-60 nm, internal diameter 7 nm and several micrometers length) through a catalyst-free In Situ co-assembly polymerization process Hydrogen bond or electrostatic interactions between the anionic silicate intermediate species and the SAFIN are proposed to be the driving force for templating. (C) 2010 Elsevier Ltd All rights reserved

【 授权许可】

Free