Synthesis and characterization of periodic porous benzene-silica hybrid powders with cubic and hexagonal symmetries

2002 ◽  
Vol 726 ◽  
Author(s):  
Valérie Goletto ◽  
Anne-Claire Bled ◽  
Gregor Trimmel ◽  
Michel Wong Chi Man ◽  
Hee-Gweon Woo ◽  
...  
Keyword(s):  
Solid State ◽  
Solvent Extraction ◽  
Mas Nmr ◽  
Synthesis And Characterization ◽  
Nmr Studies ◽  
Acidic Conditions ◽  
Silica Hybrid

AbstractOrganosilica powders with uniformly distributed bridging benzene groups have been synthesized from the condensation of bis- or tris-(triethoxysilyl)benzene in the presence of cetyltrimethylammoniumbromide. The syntheses were performed under strong acidic conditions and the organic groups were always incorporated without cleavage of the Si-C bonds as indicated by solid state MAS NMR studies. Depending on the nature of the precursors, materials with different ordering were obtained: a 2D-hexagonal (p6m) phase was formed from the 1,3-bis(triethoxysilyl)benzene, whereas the 1,4-bis(triethoxysilyl)benzene lead to a cubic Pm3n phase. The surfactant was removed either by solvent extraction or by controlled calcination, which did not affect the mesostructure of the materials.

Solid-State 29Si VACP/MAS NMR Studies of Silicon-Accumulating Plants: Structural Characterization of Biosilica Deposits

2000 ◽  
Vol 55 (6) ◽  
pp. 459-461 ◽  
Author(s):  
Rüdiger Bertermann ◽  
Reinhold Tacke
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
Typical Pattern ◽  
Nmr Studies ◽  
Polysilicic Acid ◽  
Freeze Dried ◽  
Pattern Characteristic

A series of silicon-accumulating plants [different Equisetum (horse tail) species, Echium vulgare, and Symphytum officinale] were studied by solid-state 29Si NMR experiments. For this purpose, selected parts of these plants were freeze-dried and then investigated by solid-state 29Si VACP/MAS NMR spectroscopy. The 29Si NMR spectra of these plants are quite similar and exhibit the typical pattern characteristic of polysilicic acid (amorphous silica).

Solid-state synthesis and characterization of two-dimensional hexagonal BCN nanosheet using a free template method

2021 ◽  
Vol 115 ◽  
pp. 108350
Author(s):  
Majid Mirzaee ◽  
Alimorad Rashidi ◽  
Ashkan Zolriasatein ◽  
Majid Rezaei Abadchi
Keyword(s):  
Solid State ◽  
Solid State Synthesis ◽  
Synthesis And Characterization ◽  
Template Method ◽  
Two Dimensional

Solid-State MAS NMR Studies of Sulfonic Acid-Functionalized SBA-15

2007 ◽  
Vol 32 (4) ◽  
pp. 513-526 ◽  
Author(s):  
R. Kanthasamy ◽  
I. K. Mbaraka ◽  
B. H. Shanks ◽  
S. C. Larsen
Keyword(s):  
Solid State ◽  
Sulfonic Acid ◽  
Mas Nmr ◽  
Nmr Studies

Spectroscopic characterization of the polycrystalline copper(I) di-n-butyldithiophosphate cluster – Cu8[S2P(O-n-Bu)2]6(μ8-S): Solid-state 31P CP/MAS and static 65Cu NMR studies

2006 ◽  
Vol 359 (12) ◽  
pp. 3903-3910 ◽  
Author(s):  
Daniela Rusanova ◽  
Kevin J. Pike ◽  
Ray Dupree ◽  
John V. Hanna ◽  
Oleg N. Antzutkin ◽  
...  
Keyword(s):  
Solid State ◽  
Spectroscopic Characterization ◽  
Polycrystalline Copper ◽  
Nmr Studies

Mechanochemical solid state synthesis and characterization of CdxZn1−xS nanocrystals

2008 ◽  
Vol 179 (21-26) ◽  
pp. 1242-1245 ◽  
Author(s):  
Erika Dutková ◽  
Peter Baláž ◽  
Parviz Pourghahramani ◽  
Anh V. Nguyen ◽  
Vladimír Šepelák ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Synthesis ◽  
Synthesis And Characterization

Synthesis and characterization of the binuclear diamido titanium chalcogenides [(Ar)NCH2CH2CH2N(Ar)]2Ti(µ-E)2 (E = Se, Te)

2002 ◽  
Vol 80 (11) ◽  
pp. 1524-1529 ◽  
Author(s):  
Tianle Zhang ◽  
Warren E Piers ◽  
Masood Parvez
Keyword(s):  
Solid State ◽  
Key Words ◽  
Synthesis And Characterization ◽  
Catalyst Precursor ◽  
Tellurium Atom ◽  
Titanium Complex ◽  
X Ray ◽  
X Ray Crystallography ◽  
Atom Source

Reaction of McConville's chelating amido titanium complex [(Ar)NCH2CH2CH2N(Ar)]Ti(CH3)2 (Ar = 2,6-i-Pr2C6H3) with either elemental Se or the tellurium atom source Te=PBu3 resulted in the formation of bis-µ-chalcogenido dimers [(Ar)NCH2CH2CH2N(Ar)]2Ti(µ-E)2 (E = Se, 2; Te, 3) with concommitant loss of EMe2. The dimers 2 and 3 were characterized spectroscopically and via X-ray crystallography. The two compounds are isostructural in the solid state. The tellurido dimer 3 may also be synthesized by reduction of the diamido dichloride [(Ar)NCH2CH2CH2N(Ar)]2TiCl2 with Na–Hg amalgam followed by treatment with Te=PBu3. This dimer is unreactive toward further Te=PBu3 or stannanes such as HSnBu3. Unlike decamethyltitanocene derivatives, the diamido complex is not an effective catalyst precursor for the heterohydrodecoupling of Te=PBu3 and HSnBu3.Key words: diamido titanium complexes, selenides, tellurides.

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