Surfactant Organization in MCM-41 Mesoporous Materials As Studied by13C and29Si Solid-State NMR

2001 ◽  
Vol 13 (3) ◽  
pp. 771-777 ◽  
Author(s):  
Roberto Simonutti ◽  
Angiolina Comotti ◽  
Silvia Bracco ◽  
Piero Sozzani
Keyword(s):  
Solid State ◽  
Mesoporous Materials ◽  
Solid State Nmr ◽  
Mcm 41

Characterization of Covalent Linkages in Organically Functionalized MCM-41 Mesoporous Materials by Solid-State NMR and Theoretical Calculations

2007 ◽  
Vol 111 (15) ◽  
pp. 3877-3885 ◽  
Author(s):  
Jerzy W. Wiench ◽  
Yamini S. Avadhut ◽  
Niladri Maity ◽  
Sumit Bhaduri ◽  
Goutam Kumar Lahiri ◽  
...  
Keyword(s):  
Solid State ◽  
Mesoporous Materials ◽  
Solid State Nmr ◽  
Theoretical Calculations ◽  
Mcm 41

Solid-State NMR Study of Ibuprofen Confined in MCM-41 Material

2006 ◽  
Vol 18 (26) ◽  
pp. 6382-6390 ◽  
Author(s):  
Thierry Azaïs ◽  
Corine Tourné-Péteilh ◽  
Fabien Aussenac ◽  
Niki Baccile ◽  
Cristina Coelho ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Study ◽  
Mcm 41

Efficiency of dipolar and J-derived solid-state NMR techniques for a new pair of nuclei {31P,29Si}. Towards the characterization of Si–O–P mesoporous materials

2008 ◽  
Vol 11 (4-5) ◽  
pp. 387-397 ◽  
Author(s):  
Cristina Coelho ◽  
Thierry Azais ◽  
Christian Bonhomme ◽  
Laure Bonhomme-Coury ◽  
Cédric Boissière ◽  
...  
Keyword(s):  
Solid State ◽  
Mesoporous Materials ◽  
Solid State Nmr ◽  
Nmr Techniques

Solid-State NMR Study of MCM-41-type Mesoporous Silica Nanoparticles

2005 ◽  
Vol 127 (9) ◽  
pp. 3057-3068 ◽  
Author(s):  
Julien Trébosc ◽  
Jerzy W. Wiench ◽  
Seong Huh ◽  
Victor S.-Y. Lin ◽  
Marek Pruski
Keyword(s):  
Solid State ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Solid State Nmr ◽  
Mesoporous Silica Nanoparticles ◽  
Nmr Study ◽  
Mcm 41

Solid-state NMR studies of the borosilicate mesoporous molecular sieve MCM-41

1996 ◽  
Vol 92 (11) ◽  
pp. 2011 ◽  
Author(s):  
Shuangxi Liu ◽  
Heyong He ◽  
Zhaohua Luan ◽  
Jacek Klinowski
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Molecular Sieve ◽  
Mesoporous Molecular Sieve ◽  
Nmr Studies ◽  
Mcm 41

Solid-State NMR Studies of MCM-41 Supported with a Highly Catalytically Active Cluster

2002 ◽  
Vol 41 (24) ◽  
pp. 4726-4729 ◽  
Author(s):  
Matthew D. Jones ◽  
Melinda J. Duer ◽  
Sophie Hermans ◽  
Yaroslav Z. Khimyak ◽  
Brian F. G. Johnson ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Studies ◽  
Catalytically Active ◽  
Active Cluster ◽  
Mcm 41

Synthesis, Characterization and Modification of Mcm-41 Molecular Sieves

1994 ◽  
Vol 371 ◽  
Author(s):  
A. Sayari ◽  
V.R. Karra ◽  
J.S. Reddy ◽  
I.L. Moudrakovski
Keyword(s):  
Catalytic Activity ◽  
Solid State ◽  
Molecular Sieves ◽  
Solid State Nmr ◽  
Hexagonal Phase ◽  
Mesoporous Molecular Sieves ◽  
Ammonium Bromide ◽  
Final Phase ◽  
Dimethyl Ammonium ◽  
Mcm 41

AbstractA series of crystalline mesoporous molecular sieves were prepared using alkyl hexadecyl dimethyl ammonium bromide salts (C16H33)(CnH2n + 1)(CH3)2NBr, in which the number of carbon atoms (n) in one alkyl group was varied from 1 to 12. The influence of (n) value on the nature of the final phase obtained and on its pore size was investigated. A hexagonal phase was obtained for n = 1, 3, 5 and 7, while a lamellar phase was obtained for all other templates. Vanadium and titanium modified MCM-41 molecular sieves were also prepared in the presence of C12H25(CH3)3N+ and C16H33(CH3)3N+ ions, respectively. These materials were characterized by XRD, nitrogen physisorption, FTIR, solid state NMR, XPS, UV-Vis and catalytic testing in the oxidation of 1-naphthol, 2,6-di-tert-butylphenol, norbornylene, n-hexane and propylamine. Ti-MCM-41 exhibited considerable catalytic activity only in the oxidation of aromatics, olefins and alcohols. V-MCM-41 was found to be a good catalyst in the oxidation of aromatics and alkanes.

Solid-State NMR Studies of MCM-41 Supported with a Highly Catalytically Active Cluster

2002 ◽  
Vol 114 (24) ◽  
pp. 4920-4923 ◽  
Author(s):  
Matthew D. Jones ◽  
Melinda J. Duer ◽  
Sophie Hermans ◽  
Yaroslav Z. Khimyak ◽  
Brian F. G. Johnson ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Studies ◽  
Catalytically Active ◽  
Active Cluster ◽  
Mcm 41

Solid-state NMR characterization of drug-model molecules encapsulated in MCM-41 silica

2009 ◽  
Vol 81 (8) ◽  
pp. 1345-1355 ◽  
Author(s):  
Thierry Azaïs ◽  
Geoffrey Hartmeyer ◽  
Sandrine Quignard ◽  
Guillaume Laurent ◽  
Corine Tourné-Péteilh ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Quantum Coherence ◽  
Spin Diffusion ◽  
Nuclear Overhauser Effect ◽  
Pulse Excitation ◽  
Multiple Quantum ◽  
Mobile Species ◽  
Nmr Characterization ◽  
Mcm 41

In this contribution, we present a solid-state NMR approach to characterize drug-model molecules as ibuprofen, benzoic acid and lauric acid, encapsulated in MCM-41 silica and submitted to strong confinement effects. In particular, we show that by a careful choice of the solid-state NMR sequences, it is possible to efficiently characterize these highly mobile molecules and their interactions with the pore surface. Thus, we demonstrate that 13C NMR spectroscopy is a powerful tool to characterize and even quantify entrapped and non-entrapped species by using either single-pulse excitation (SPE) or cross-polarization (CP). Whereas the standard {1H}-13C CP experiment is of poor efficiency for mobile species, we show that 13C signal-to-noise (S/N) ratio can be significantly improved through 1H-13C cross-relaxation (namely, nuclear Overhauser effect, nOe) by using a 1H power-gated technique. The long transversal relaxation times [T2(1H) up to 22 ms] observed allow the set-up of J-coupling based experiments such as 2D {1H}-13C heteronuclear multiple-quantum coherence (HMQC) in order to fully characterize the encapsulated molecules. Thus, we demonstrate that the use of sequences derived from solution-state NMR such as these two latter experiments is highly efficient to characterize highly mobile organic molecules trapped in mesopores. Finally, we show that 1H spin diffusion-based experiments can give useful informations on the proximities between trapped molecules and the silica surface.

Using Trimethylphosphine as a Probe Molecule to Study the Acid Sites in Al−MCM-41 Materials by Solid-State NMR Spectroscopy

2003 ◽  
Vol 107 (11) ◽  
pp. 2435-2442 ◽  
Author(s):  
Qing Luo ◽  
Feng Deng ◽  
Zhongyong Yuan ◽  
Jun Yang ◽  
Mingjin Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Acid Sites ◽  
Probe Molecule ◽  
Solid State Nmr Spectroscopy ◽  
Mcm 41
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