scholarly journals Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials

2018 ◽  
Vol 14 ◽  
pp. 1498-1507 ◽  
Author(s):  
Alberto Spinella ◽  
Marco Russo ◽  
Antonella Di Vincenzo ◽  
Delia Chillura Martino ◽  
Paolo Lo Meo
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Hydrophobic Interactions ◽  
Morphological Characterization ◽  
New Class ◽  
Polymeric Network ◽  
Electrostatic And Hydrophobic Interactions ◽  
Nmr Techniques ◽  
Organic Guests ◽  
Ph Dependent

New calixarene-based nanosponges (CaNSs), i.e., hyper-reticulated polymers constituted by calixarene monomer units joined by means of bis(1,2,3-trialzolyl)alkyl linkers, were synthesized, characterized and subjected to preliminary tests to assess their supramolecular absorption abilities towards a set of suitable organic guests, selected as pollutant models. The synthesis was accomplished by means of a CuAAC reaction between a tetrakis(propargyloxy)calix[4]arene and an alkyl diazide. The formation of the polymeric network was assessed by means of FTIR and 13C{1H} CP-MAS solid-state NMR techniques, whereas morphological characterization was provided by SEM microghaphy. The materials were proved to possess pH-dependent sequestration abilities, due to the presence of the weakly basic triazole linkers. Sequestration efficiency indeed depends on the effective occurrence of both electrostatic and hydrophobic interactions between the guest and the polymer lattice. Thus, our CaNS nanosponges can be considered as a new class of purely synthetic smart absorbent materials.

ChemInform Abstract: Solid-State NMR Techniques in Oriented Systems

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
K. V. RAMANATHAN ◽  
B. S. ARUNKUMAR ◽  
N. SURYAPRAKASH ◽  
R. PRATIMA ◽  
C. L. KHETRAPAL
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Techniques

Suitability of Different 13C Solid-state NMR Techniques in the Characterization of Humic Acids

2002 ◽  
Vol 82 (4) ◽  
pp. 183-196 ◽  
Author(s):  
Jingdong Mao ◽  
Weiguo Hu ◽  
Guangwei Ding ◽  
Klaus Schmidt-Rohr ◽  
Geoffrey Davies ◽  
...  
Keyword(s):  
Solid State ◽  
Humic Acids ◽  
Solid State Nmr ◽  
Nmr Techniques

scholarly journals Solid-State NMR Techniques for the Structural Characterization of Cyclic Aggregates Based on Borane–Phosphane Frustrated Lewis Pairs

Molecules ◽  
2020 ◽  
Vol 25 (6) ◽  
pp. 1400 ◽  
Author(s):  
Robert Knitsch ◽  
Melanie Brinkkötter ◽  
Thomas Wiegand ◽  
Gerald Kehr ◽  
Gerhard Erker ◽  
...  
Keyword(s):  
Solid State ◽  
Structural Characterization ◽  
Solid State Nmr ◽  
Magic Angle ◽  
Frustrated Lewis Pairs ◽  
Wide Range ◽  
Nmr Techniques ◽  
Nmr Methods ◽  
Lewis Pairs

Modern solid-state NMR techniques offer a wide range of opportunities for the structural characterization of frustrated Lewis pairs (FLPs), their aggregates, and the products of cooperative addition reactions at their two Lewis centers. This information is extremely valuable for materials that elude structural characterization by X-ray diffraction because of their nanocrystalline or amorphous character, (pseudo-)polymorphism, or other types of disordering phenomena inherent in the solid state. Aside from simple chemical shift measurements using single-pulse or cross-polarization/magic-angle spinning NMR detection techniques, the availability of advanced multidimensional and double-resonance NMR methods greatly deepened the informational content of these experiments. In particular, methods quantifying the magnetic dipole–dipole interaction strengths and indirect spin–spin interactions prove useful for the measurement of intermolecular association, connectivity, assessment of FLP–ligand distributions, and the stereochemistry of adducts. The present review illustrates several important solid-state NMR methods with some insightful applications to open questions in FLP chemistry, with a particular focus on supramolecular associates.

scholarly journals Probing the interaction of U(vi) with phosphonate-functionalized mesoporous silica using solid-state NMR spectroscopy

2016 ◽  
Vol 45 (25) ◽  
pp. 10447-10458 ◽  
Author(s):  
Eva C. Uribe ◽  
Harris E. Mason ◽  
Jennifer A. Shusterman ◽  
Anthony Bruchet ◽  
Heino Nitsche
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Mesoporous Silica ◽  
Solid State Nmr ◽  
Solid State Nmr Spectroscopy ◽  
Functionalized Mesoporous Silica ◽  
Nmr Techniques ◽  
Contact Experiments

Solid-state NMR techniques combined with batch contact experiments elucidate how U(vi) binds to phosphonate-functionalized mesoporous silica.

Interaction between lipid bilayers and a new class of antineoplastic agents derived from arylchloroethylurea: a 2H solid-state NMR study

1998 ◽  
Vol 76 (2-3) ◽  
pp. 465-471
Author(s):  
Audrey Saint-Laurent ◽  
Nadine Boudreau ◽  
René C.-Gaudreault ◽  
Patrick Poyet ◽  
Michèle Auger
Keyword(s):  
Solid State ◽  
Lipid Bilayers ◽  
Solid State Nmr ◽  
Antineoplastic Agents ◽  
New Class ◽  
Nmr Study

Solid State NMR Studies of the Adsorbed States of Formic Acid on Y Zeolites

1980 ◽  
Vol 3 ◽  
Author(s):  
T. Michael Duncan ◽  
Robert W. Vaughan
Keyword(s):  
Solid State ◽  
Formic Acid ◽  
Solid State Nmr ◽  
Double Resonance ◽  
Chemical Shift Anisotropy ◽  
Surface States ◽  
Cross Polarization ◽  
Nmr Studies ◽  
Y Zeolites ◽  
Nmr Techniques

ABSTRACTSeveral multiple-pulse double-resonance NMR techniques have been applied to isolate and characterize the spectra of the adsorbed states of formic acid on two Y zeolites. The two surface states, bidentatT3 and ynidentate, possess different motional properties and 13C - H cross-polarization techniques may be used to separate the spectra. The 13C chemical shift anisotropy is founa to iorrelate with the symmetry of the formate species. The H spectrum of the carbonyl hydrogen, selectively observed with the dipolardifference method, indicates that this hydrogen becomes more acidic upon adsorption.

A DNP-supported solid-state NMR study of carbon species in fluid catalytic cracking catalysts

2017 ◽  
Vol 53 (28) ◽  
pp. 3933-3936 ◽  
Author(s):  
Deni Mance ◽  
Johan van der Zwan ◽  
Marjolein E. Z. Velthoen ◽  
Florian Meirer ◽  
Bert M. Weckhuysen ◽  
...  
Keyword(s):  
Solid State ◽  
Catalytic Cracking ◽  
Solid State Nmr ◽  
Fluid Catalytic Cracking ◽  
Carbon Deposits ◽  
Carbon Species ◽  
Nmr Study ◽  
Nmr Techniques ◽  
Cracking Catalysts

Solid-state NMR techniques supported by EPR and SEM-EDX enable spatial speciation of carbon deposits in commercial fluid catalytic cracking catalysts.

Modern solid state NMR techniques and concepts in structural studies of synthetic polymers

2016 ◽  
Vol 27 (9) ◽  
pp. 1143-1155 ◽  
Author(s):  
S. Kaźmierski ◽  
T. Pawlak ◽  
A. Jeziorna ◽  
M. J. Potrzebowski
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Synthetic Polymers ◽  
Structural Studies ◽  
Nmr Techniques
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