13C CP/MAS NMR spectra of poly-β-D(1 → 4) mannose: mannan

1990 ◽  
Vol 68 (7) ◽  
pp. 1192-1195 ◽  
Author(s):  
R. H. Marchessault ◽  
M. G. Taylor ◽  
W. T. Winter
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Repeat Unit ◽  
Intramolecular Hydrogen Bonding ◽  
Lower Mobility ◽  
Intramolecular Hydrogen ◽  
Cp Mas Nmr ◽  
13C Cp Mas Nmr

13C solid-state NMR spectra (CP/MAS) were recorded for mannan polymorphs: mannan I ("ivory nut") and mannan II (Codiumfragile). These pure mannans, poly-β-(1 → 4) mannopyranose, show a single resonance for each carbon of the chemical repeat unit. This is the expected result based on the crystalline P212121 and 1222 symmetries. The T1 values were also recorded and the results are compared to those for cellulose obtained from the literature. The much lower mobility of C-6, even in noncrystalline mannan, compared to native cellulose is attributed to the epimeric difference at C-2 between cellulose and mannan allowing intramolecular hydrogen bonding in the former but not the latter. Keywords: mannan, solid state NMR, T1 relaxation, polysaccharide, ivory nut.

Intramolecular hydrogen bonding in N-salicylideneanilines. X-ray diffraction and solid-state NMR studies

1995 ◽  
Vol 91 (1) ◽  
pp. 77 ◽  
Author(s):  
Krzysztof Wozniak ◽  
Heyong He ◽  
Jacek Klinowski ◽  
William Jones ◽  
Teresa Dziembowska ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Solid State Nmr ◽  
Intramolecular Hydrogen Bonding ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
X Ray ◽  
Intramolecular Hydrogen

scholarly journals Solid-State 13C CP MAS NMR Spectroscopy as a Tool for Detection of (1→3, 1→6)-β-D-Glucan in Products Prepared from Pleurotus ostreatus

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
O. Fričová ◽  
M. Koval'aková
Keyword(s):  
Solid State ◽  
Pleurotus Ostreatus ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
Oyster Mushroom ◽  
Trace Compounds ◽  
Cp Mas Nmr ◽  
Nmr Solid ◽  
13C Cp Mas Nmr

The 13C CP/MAS NMR solid-state NMR technique was used to detect the presence of β-D-glucan and trace compounds in samples prepared from dried, naturally grown oyster mushroom (Pleurotus ostreatus) and commercially available products of dried, specially cultivated oyster mushroom and β-D-glucan isolated from this mushroom. The NMR spectra of all samples displayed signals typical for (1→3, 1→6)-β-D-glucan; however, signals which could be assigned to other trace compounds—(1→3)-α-glucan, chitin, and proteins—were also observed in the spectra. The amount of trace compounds was negligible in the commercially available products.

Gold(I) 1,2,3-Triazolylidene Complex Featuring the Interaction Between Gold and Methine Hydrogen

2021 ◽  
Author(s):  
Adi Narayana Mannem ◽  
Moulali Vaddamanu ◽  
Arruri Sathyanarayana ◽  
Kumar Siddhant ◽  
Shohei Sugiyama ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Intramolecular Hydrogen Bonding ◽  
Hydrogen Bonding Interaction ◽  
Bonding Interaction ◽  
Ft Ir ◽  
Intramolecular Hydrogen

Mesoionic N-heterocyclic carbene-gold(I) complex with a unique Au····H–C(methine) intramolecular hydrogen bonding interaction has been investigated in the solid-state. The structure of this new neutral gold(I)-carbene was characterized by FT-IR, NMR...

Solution Structures of Pyrophthalones, II [1]. Structure and Conformation of Iminopyrophthalone — a High Resolution 1H, 13C, 15N and Solid State 13C-CP/MAS-NMR Study

1987 ◽  
Vol 42 (11) ◽  
pp. 1419-1423 ◽  
Author(s):  
Erhard T. K. Haupt ◽  
Heindirk tom Dieck ◽  
Panayot R. Bontchev
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Nmr Spectra ◽  
Solution Structure ◽  
Complete Analysis ◽  
State Structure ◽  
Solution Structures ◽  
Nmr Study ◽  
Cp Mas Nmr ◽  
13C Cp Mas Nmr

The complete analysis of the 1H, 13C, 15N NMR spectra of iminopyrophthalone demonstrates that the solution structure of the molecule must be described as a protonated iminocompound. 13C-CP/MAS spectroscopy proves that the solid state structure of α-PPH and IPH are equivalent to the solution structure.

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