Si–C attachment points during sol–gel synthesis of organosilicas from 2,8-bis-silylated Tröger's base as building block precursor

Poli, Evelyne; Merino, Estı́baliz; Díaz, Urbano; Brunel, Daniel; Corma, Avelino

doi:10.1039/c1jm10426h

Cited by 3 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…36 The Si-C hydrolysis was reported to occur during the preparation of hybrid phenylene-bridged materials, when the sol-gel reaction was performed under hydrothermal conditions in basic media, i. e., a methodology similar to the one followed in the present study. 53,54,55 On the other hand, the preparation of layered hybrid materials, LHM-TEMS, by combination of organosilane and monosilane precursors resulted in hybrid materials containing standard tetrahedral silicon units Si(nAl) in their framework from TEOS. One additional chemical shift around -85 ppm, together with T-type silicon species due to the presence of silyl-ethylendiamino and silyl-methyl groups from BTMN and TEMS precursors can be observed ( Figure 6 and Table 2 (Table 2).…”

Section: Spectroscopic Characterizationmentioning

confidence: 99%

One-pot synthesis of hierarchical porous layered hybrid materials based on aluminosilicate sheets and organic functional pillars

et al. 2014

Self Cite

View full text Add to dashboard Cite

Layered hybrid materials (LHMs) based on ordered silicoaluminate sheets linked with organic fragments, perpendicularly located and stabilized in the interlayer space, were synthesized by one-pot direct hydrothermal process, in absence of structural directing agents (SDAs), and using bridged silsesquioxanes as organosilicon precursors. By following the synthesis described here, the preliminary preparation of inorganic layered precursors, post-synthesis swelling and/or pillaring treatments can be avoided. The physico-chemical and structural characteristics of the materials were studied by chemical and thermogravimetrical analyses, X-ray diffraction, TEM microscopy, spectroscopic techniques (NMR and FTIR) and textural measurements. The complete exchange of intracrystalline sodium cations by protons, without substantial structural alteration of hybrid materials, facilitated the generation of hybrid materials, which contained acid and base sites located in the inorganic (silicoaluminate layers) and in the organic interlayer linkers, respectively, being the resultant acid-base materials active and selective catalysts.

show abstract

Section: Spectroscopic Characterizationmentioning

confidence: 99%

One-pot synthesis of hierarchical porous layered hybrid materials based on aluminosilicate sheets and organic functional pillars

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…The latter family of materials has been used for catalytic processes involving the formation of CC bonds . The advances in the routes of preparing hybrid materials made by the Corma group offer the opportunity to simultaneously integrate, in the same mesoporous framework, strong acid centers, derived from sulfonic groups, together with highly selective strong bases, derived from Tröger’s base , or protonic sponges . Their high catalytic activity for the S-arylation and azide–alkyne cycloaddition reactions confirm the validity of the multifunctional hybrid materials to be used as effective heterogeneous catalysts with similar or even higher performances than their homogeneous counterparts .…”

Section: Synthesis and Applications Of Hybrid Organic–inorganic Mater...mentioning

confidence: 89%

A Career in Catalysis: Avelino Corma

et al. 2022

Self Cite

View full text Add to dashboard Cite

As one of the most influential scientists in the field of heterogeneous catalysis and materials science, Prof. Avelino Corma has made significant contributions in many diverse fields, spanning over solid catalysts for petrochemistry, solid catalysts for production of fine chemicals, synthesis of microporous and mesoporous materials, development of inorganic–organic hybrid materials, supported metal catalysts (from isolated metal atoms to nanoclusters and nanoparticles) and photochemistry with solid materials. These experimental approaches are complemented with characterization of solid materials with advanced spectroscopy and microscopy techniques as well as theoretical calculations/modeling. The aim of this Account is to overview Avelino’s distinguished scientific career and highlight the most remarkable achievements made in his research activities during >40 years. We attempt to show the evolution of Avelino’s research topics in his group throughout his career and the approaches that Avelino has chosen to tackle the challenges encountered. The research paradigm developed by Avelino and his team can be inspiring to the researchers in the field of materials science who are striving to translate the knowledge generated in fundamental studies into practical applications for addressing the new scientific challenges encountered in building a sustainable world.

show abstract

“…The incorporation of photoresponsive precursors into the sol-gel matrix as organic building blocks can be a powerful tool for developing new fluorescent organosilicas for optical applications such as photostabilizers, waveguides, laser materials, and organic light emitting diodes (OLEDs). [1][2][3][4][5][6][7][8][9][10] In particular, selfassembly of bridged silsesquioxanes represents a typical and efficient approach to design and fabricate silica-based hybrid materials based on a sol-gel process. 11 The concept of selfdirected assembly in sol-gel derived bridged silsesquioxane hybrid materials was first presented by Moreau et al, 12 where new hybrid materials were reported with helical morphology via H-bond mediated hydrolysis of a single chiral precursor.…”

Section: Introductionmentioning

confidence: 99%

Bis-silylated terephthalate as a building block precursor for highly fluorescent organic–inorganic hybrid materials

et al. 2012

View full text Add to dashboard Cite

A bis-silylated diethyl 2,5-bis [N,N-(3-triethoxysilyl)propylurea]terephthalate precursor (5) was synthesized from a terephthalate derivative (3) and successfully used to prepare highly fluorescent organosilicas by hydrolytic self-condensation (DPM1) and co-condensation (DPM2) with tetraethoxysilane. The dyes 3 and 5 present absorption in the UV-Vis region and fluorescence emission in the yellow and blue regions, respectively. The red-shifted bands in the absorption spectra of dye 3 with respect to dye 5 can be related to the formation of intramolecular charge transfer (ICT) state even in the ground-state due to the strong electron-donor amino groups and moderate electron-withdrawing carbonyl groups present in the benzenic ring. The small Stokes' shift, as well as the high fluorescence quantum yield values discards the intramolecular proton transfer mechanism in the excited state. The fluorescence emission dependence on the solvent polarity indicates that an intramolecular charge transfer (ICT) or a locally excited (LE) state is taking place in the excited state to the dyes 3 and 5, respectively. The new fluorescent hybrid materials (DPM1 and DPM2) show absorption maxima in the solid state located at around 390 nm, indicating that the electronic structure of the fluorescent precursor was not significantly perturbed in the ground state after its self-condensation or co-condensation with TEOS. The fluorescent material DPM2 presents a photophysical behavior quite similar to the precursor in solution. On the other hand, the self-condensed material DPM1 presents a fluorescence emission maximum red-shifted by 33 nm, which can be probably attributed to p-p stacking between the terephthalate cores. Any evidence of auto-organization could be observed in these materials.

show abstract

Si–C attachment points during sol–gel synthesis of organosilicas from 2,8-bis-silylated Tröger's base as building block precursor

Cited by 3 publications

References 48 publications

One-pot synthesis of hierarchical porous layered hybrid materials based on aluminosilicate sheets and organic functional pillars

One-pot synthesis of hierarchical porous layered hybrid materials based on aluminosilicate sheets and organic functional pillars

A Career in Catalysis: Avelino Corma

Bis-silylated terephthalate as a building block precursor for highly fluorescent organic–inorganic hybrid materials

Contact Info

Product

Resources

About