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@proceedings{1122963,
author = {Stýskalík, Aleš and Škoda, David and Moravec, Zdeněk and Pinkas, Jiří and Barnes, Craig},
booktitle = {The 246th ACS National Meeting, Indianapolis, Indiana, USA},
keywords = {Porous; hybrid; inorganic-organic; phosphosilicates},
language = {eng},
title = {Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions},
year = {2013}
}
TY - CONF
ID - 1122963
AU - Stýskalík, Aleš - Škoda, David - Moravec, Zdeněk - Pinkas, Jiří - Barnes, Craig
PY - 2013
TI - Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions
KW - Porous
KW - hybrid
KW - inorganic-organic
KW - phosphosilicates
N2 - Non-hydrolytic condensation reactions became a powerful substitute for aqueous techniques in the area of sol-gel synthesis of multimetallic oxides and inorganic-organic hybrid materials in the form of xerogels, nanoparticles, and thin films. We developed a non-hydrolytic sol-gel route based on acetic acid ester elimination providing phosphosilicate hybrid inorganic-organic materials. The polycondensation reactions between Si(OAc)4 and OP(OSiMe3)3 led to microporous phosphosilicate xerogels with surface areas up to 568 m2 g-1. The consecutive substitution of Si and P precursors by acetoxysilanes 1RxSi(OC(O)CH3)4-x (1R = Me, Ph; x = 1-2) and trimethylsilylesters of phosphonic acid 2RP(O)(OSiMe3)2 (2R = c-Hex, Ph) caused the decrease of surface areas and increase of average pore sizes because of the lower cross-linking ability of the substituted precursors. We avoided a significant decrease of surface areas of hybrid xerogels by changing starting precursors to acetoxysilanes and phosphonic acid esters with bridging alkyl or aryl groups (AcO)3Si-(CH2)x-Si(OAc)3 (x = 1-3, 6), (Me3SiO)2P(O)-3R-P(O)(OSiMe3)2 (3R = C2H4, C6H4). Our aim was to study the versatility of these reactions and tune the properties of resulting xerogels, such as surface area, pore size distribution, chemical and thermal stability. The prepared xerogels were characterized by solid-state 13C, 29Si, 31P NMR, IR spectroscopy, surface area analysis, TGA, and XRD.
ER -
STÝSKALÍK, Aleš, David ŠKODA, Zdeněk MORAVEC, Jiří PINKAS a Craig BARNES. Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions. In \textit{The 246th ACS National Meeting, Indianapolis, Indiana, USA}. 2013.
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