scholarly journals Revealing long- and short-range structural modifications within phosphorus-treated HZSM-5 zeolites by atom probe tomography, nuclear magnetic resonance and powder X-ray diffraction

2018 ◽  
Vol 20 (44) ◽  
pp. 27766-27777 ◽  
Author(s):  
Rosa Micaela Danisi ◽  
Joel E. Schmidt ◽  
Alessandra Lucini Paioni ◽  
Klaartje Houben ◽  
Jonathan D. Poplawsky ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Atom Probe Tomography ◽  
Short Range ◽  
Atom Probe ◽  
Acid Sites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Modifications ◽  
Nuclear Magnetic

Analysis of phosphate-stabilized H-ZSM-5 reveals the formation of new acid sites and the formation of Si–O–P bonds.

Tautomerism of bis(2-benzothiazolyl)methanes

1988 ◽  
Vol 66 (6) ◽  
pp. 1467-1473 ◽  
Author(s):  
Carmen Avendaño ◽  
María Teresa Ramos ◽  
José Elguero ◽  
María Luisa Jimeno ◽  
Juana Bellanato ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Methyl Derivative ◽  
Model Compounds ◽  
X Ray ◽  
Nuclear Magnetic

Tautomerism of dibenzothiazolylmethane (1) and its C-methyl derivative (2) has been studied by 1H nuclear magnetic resonance, ultraviolet, and infrared spectroscopy using C,C-dimethyl (3) and N-methyl (4) derivatives as model compounds of the "CH" and "NH" forms, respectively. X-ray diffraction analysis of the "fixed" N-methyl derivative 4 shows that it corresponds to the Z-sE isomer 4b2. The CH tautomers are unstable in solution and they slowly isomerize into a mixture of NH tautomers that depends on the solvent and on the C-substituent (H or CH3).

Structure of nepetalic acid in the solid state and in solution by x-ray diffraction and nuclear magnetic resonance analysis

1981 ◽  
Vol 46 (16) ◽  
pp. 3302-3305 ◽  
Author(s):  
Edmund J. Eisenbraun ◽  
Clinton E. Browne ◽  
Ernest L. Eliel ◽  
David L. Harris ◽  
Asadur Rahman ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Resonance Analysis ◽  
Nuclear Magnetic
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