Synthesis and Hydrolytic Stability of Some Organosilicon Phosphonate Esters

Barnes, Garrett H.; David, M. P.

doi:10.1021/jo01077a030

Cited by 25 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work we report the block copolymer-templated synthesis of mesoporous organosilica from inexpensive sodium metasilicate under weak acid conditions (acetic acid). Diethylphosphatoethyltriethoxysilane (DPTS) was chosen for incorporation of P-containing functional groups, because its hydrolysis in acidic medium causes the formation of Pcontaining oligomers [≡Si(CH 2 ) 2 P(O)(OH) 2 ] n [28]. The amount of DPTS in the synthesis gel was varied to study its effect on the porosity and mesostructural ordering.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

Дударко

Gunathilake

Wickramaratne

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533 m 2 /g) and well developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0 mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large scale applications.Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

Дударко

Gunathilake

Wickramaratne

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

show abstract

“…The Si-C and P-C bonds have excellent stability; no leverage is observed under hydrolytic, basic, and acidic conditions. [22][23][24][25] Herein, we report a new sol-gel route to synthesize proton conductive hybrid silicas with stable phosphonic acid functionalization. This paper attempts to study the stable phosphorylation, investigate the increased functionalization for improved proton conductivity, and elucidate the proton conduction mechanism involved in this system.…”

Section: Introductionmentioning

confidence: 99%

Hydrolytically Stable Phosphorylated Hybrid Silicas for Proton Conduction

Jin

Qiao

Costa

et al. 2007

Adv Funct Materials

112

View full text Add to dashboard Cite

A new approach to the synthesis of fully immobilized phosphorus functionalized hybrid proton conductive gels based on phosphonic acid grafting is presented in this paper. The hybrid silicas with different amounts of phosphonic acid have been prepared and characterized using Fourier‐transform infrared spectroscopy, X‐ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area analysis, thermogravimetric analysis, and electrochemical techniques. The proton conductivity of the materials depend strongly on hydration, which increases by four orders of magnitude over the relative humidity (RH) range of 20 to 100 %, up to a maximum of 0.027 S cm–1 at 100 °C and 100 % RH. For the reported samples, proton conduction is believed to occur within a dynamic hydrogen‐bond network formed by functionalized P–OH groups and water molecules by the Grotthuss mechanism. However, the proton conductive sites (P–OH) are likely to be partially immobilized by strong protonic receptors (N atoms in amines), which reduces the free P–OH groups and restricts proton transfer. Hydration may cause a bonding structural rearrangement, which results in more free P–OH groups as active proton conductive sites and, therefore, greatly increased proton conductivity is observed.

show abstract

“…The diethylphosphonates 2b,c were synthesized by an Arbuzov reaction of 1b,c with triethylphosphite at T = 160°C, while 2a was obtained by radical promoted addition of diethylphosphite to the corresponding vinylsilane [27,28]. The colorless liquids were characterized by 1 H-and 13 C-NMR spectroscopy.…”

Section: Synthesismentioning

confidence: 99%