Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions

STÝSKALÍK, Aleš, David ŠKODA, Zdeněk MORAVEC, Jiří PINKAS and Craig BARNES. Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions. In The 246th ACS National Meeting, Indianapolis, Indiana, USA. 2013.

Basic information

• Original name: Porous hybrid inorganic-organic phosphosilicate materials by non-hydrolytic sol-gel polycondensation reactions
• Authors: STÝSKALÍK, Aleš (203 Czech Republic, belonging to the institution), David ŠKODA (203 Czech Republic, belonging to the institution), Zdeněk MORAVEC (203 Czech Republic, belonging to the institution), Jiří PINKAS (203 Czech Republic, guarantor, belonging to the institution) and Craig BARNES (840 United States of America).
• Edition: The 246th ACS National Meeting, Indianapolis, Indiana, USA, 2013.

Other information

• Original language: English
• Type of outcome: Conference abstract
• Field of Study: 10402 Inorganic and nuclear chemistry
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14740/13:00069405
• Organization unit: Central European Institute of Technology
• UT WoS: 000329618404650
• Keywords in English: Porous; hybrid; inorganic-organic; phosphosilicates

Abstract

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.

Links

• ED1.1.00/02.0068, research and development project: Name: CEITEC - central european institute of technology
• LH11028, research and development project: Name: Nehydrolytické sol-gelové reakce pro přípravu křemičitanů a fosforečnanů s řízenou porozitou a funkčními skupinami na povrchu (Acronym: NHSGKNOX)

Investor: Ministry of Education, Youth and Sports of the CR