Localization of hydrogen bond deuterons in proton sponges by dipolar solid state 15N NMR spectroscopy

1998 ◽  
Vol 102 (3) ◽  
pp. 414-418 ◽  
Author(s):  
Concepción López ◽  
Philippe Lorente ◽  
Rosa María Claramunt ◽  
Javier Marín ◽  
Concepcion Foces-Foces ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
15N Nmr ◽  
15N Nmr Spectroscopy ◽  
Proton Sponges

High-Resolution Solid-State 13C and 15N NMR Spectroscopy of Pyrazole and 3,5-Dimethylpyrazole Adsorbed on Alumina and Silica

1994 ◽  
Vol 98 (35) ◽  
pp. 8752-8760 ◽  
Author(s):  
Francisco Aguilar-Parrilla ◽  
Rosa M. Claramunt ◽  
Concepcion Lopez ◽  
Dionisia Sanz ◽  
Hans-Heinrich Limbach ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
15N Nmr ◽  
15N Nmr Spectroscopy

Probing the Electronic Structure of a Thorium Nitride Complex by Solid-State 15N NMR Spectroscopy

2020 ◽  
Vol 59 (14) ◽  
pp. 10138-10145
Author(s):  
Dumitru-Claudiu Sergentu ◽  
Greggory T. Kent ◽  
Selena L. Staun ◽  
Xiaojuan Yu ◽  
Herman Cho ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
15N Nmr ◽  
15N Nmr Spectroscopy

scholarly journals Solid-State 15N NMR Spectroscopy of Coal

1995 ◽  
Vol 9 (6) ◽  
pp. 999-1002 ◽  
Author(s):  
Heike Knicker ◽  
Patrick G. Hatcher ◽  
Alan W. Scaroni
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
15N Nmr ◽  
15N Nmr Spectroscopy

scholarly journals Nature of organic carbon and nitrogen in physically protected organic matter of some Australian soils as revealed by solid-state 13C and 15N NMR spectroscopy

Soil Research ◽  
2000 ◽  
Vol 38 (1) ◽  
pp. 113 ◽  
Author(s):  
H. Knicker ◽  
J. O. Skjemstad
Keyword(s):  
Organic Matter ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Bulk Sample ◽  
High Energy ◽  
15N Nmr ◽  
Particle Size Fractions ◽  
Carbon And Nitrogen ◽  
Photo Oxidation ◽  
15N Nmr Spectroscopy

The <53-□m particle-size fractions of 5 different Australian soils were subjected to high energy ultraviolet (UV) photo-oxidation for a period of 2 h in order to remove most of the physically unprotected organic material. Solid-state 13C and 15N nuclear magnetic resonance (NMR) spectroscopy was applied for characterising the chemical nature of the remaining organic fraction. The 13C NMR spectroscopic comparison of the residues after UV photo-oxidation and the untreated bulk soils revealed a considerable increase in condensed aromatic structures in the residues for 4 of the 5 soils. This behaviour was recently shown to be typical for char-containing soils. In the sample where no char was detectable by NMR spectroscopy, the physically protected carbon consisted of functional groups similar to those observed for the organic matter of the bulk sample, although their relative proportions were altered. The solid-state 15N NMR spectrum from this sample revealed that some peptide structures were able to resist UV photo-oxidation, probably physically protected within the core of microaggregates. Heterocyclic aromatic nitrogen was not detected in this spectrum, but pyrrolic nitrogen was found to comprise a major fraction of the residues after photo-oxidation of the <53-□m fractions of the char- containing soils. Acid hydrolysis of these samples confirmed that some peptide-like material was still present. The identification of a considerable amount of aromatic carbon and nitrogen, assignable to charred material in 4 of the 5 investigated soils, supports previous observations that char largely comprises the inert or passive organic matter pool of many Australian soils. The influence of such material on the carbon and nitrogen dynamics in such soils, however, requires further research.

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