Deuterium oxide was determined in synthetic mixtures of 70100 % D2O and 90100 % D2O by NMR spectroscopy with a Varian A-60 NMR spectrometer using peak heights and areas. The standard deviation for the best results was 0.4 % D2O.doi:10.1080/00032716908051277...
Can you dissolve in D2O, remove the solventin vacuo, then dissolve it again? If neither of these are realistic options, there are various water suppression NMR experiments, or water non-excitation schemes. The simplest version of the former is to saturate the water peak with a long, low-pow...
This approach provides a coherent interpretation of the different events experimentally (calorimetry, neutron, NMR, near and far infra-red spectroscopies) detected in interfacial water at 160, 220 and 250 K. Starting from an amorphous state of water at low temperature, these transitions are ...
The ranges of dominant peaks are enlarged to clearly show the slight change of peak position with temperature. Extended Data Fig. 5 Diffusion-rate calculation. Diffusion rates (k) of H2O and D2O in (a) FDC–1a and (b) FDC–2a. Calc.1 represents the calculated diffusion rates considering ...
Microemulsion systems consisting of D2O, an alkane, an anionic internal olefin sulfonate surfactant, salt and secondary butyl alcohol (SBA) as co-solvent are studied in a systematic way. In four different sample sets, either the salt content, SBA content or alkane carbon number was varied in or...
3.4. NMR spectra of PBMP1 The 1H NMR results of PBMP1 in this study showed that the peak signal at δ 4.699 ppm was the heavy water peak (Fig. 4A); the resonance peak region of δ 4.70–5.50 ppm for the anomeric hydrogen was dominated by two prominent anomeric hydrogen resonance peaks...
NMR (DMSO-d6-D2O, 100°C) δ ppm; 7.50-6.70 (10H, m), 5.50-5.40 (1H, m), 5.00-2.50 (2H, m), 2.37 (6H, s), 2.40-1.50 (4H, m) Example 4 A 3.0 g quantity of compound (1a-2) was dissolved in 100 ml of methylene chloride, and a solution of 10 ml of trifluoroacetic ac...
The ν OD band of solubilized HOD (4% D2O in H2O) has been recorded as a function of [water]/[surfactant] molar ratio, W/S. Curve fitting of this band showed the presence of a small peak at (2375 ± 12) cm−1 and a major one at (2521 ± 7) cm−1;...
(Supplementary Fig.22), some small peaks could also be found, which are assigned to the resonances of HC = CH groups due to incomplete deuteration. The deuterated efficiency was deduced to be 91 atom% according to the integration of different peaks in their1H NMR spectra. Then their ...
In addition, the peak at 399.2 eV in the N1s spectrum and the peak at 689.0 eV in the F1s spectrum are characteristic of the NTf2− anion29. These species are characteristic of the molecular modifier, confirming that this is present on the CNTs and retains molecular structure ...