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...
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 ...
Nanoconfined water plays a pivotal role in a vast number of fields ranging from biological and materials sciences to catalysis, nanofluidics and geochemistry. Here, we report the freezing and melting behavior of water (D2O) nanoconfined in architected si
The interactions between water and LiPAA were probed via 1H NMR and 7Li NMR. LiPAA gives rise to a broad 1H NMR (Fig. 3a) peak between 12 and −8 ppm that arises from the CH2 and CH3 groups in LiPAA, the restricted motion and consequently large 1H dipole–dipole interactions, and...
The procedures of Lecomte and co-workers were used to determine pKa values by NMR spectroscopy (Lecomte and Cocco, 1990; Cocco et al., 1992; Bhattacharya and Lecomte, 1997; Kao et al., 2000). Protein samples at concentrations of ∼1.2 mM were prepared by solvent exchange in D2O containin...
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...
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...
Cobalt(II) complex, [Co(ONO2)2(H2O)(mprpz)] (1) where mprpz is 2,6-bis(3-methylpyrazol-1-yl)pyrazine (see NMR spectra in Supplementary Fig. 16), was synthesized as described in "Methods". The single-crystal XRD analysis of 1 at 190 K (high- temperature phase, HTp), ...
NMR data from (i) cells incubated with H2O2at 50 min, (ii) cells incubated without H2O2at 50 min, (iii) cells incubated with H2O2after 24 h of incubation and (iv) cells incubated without H2O2at 24 h. Three classes are observed where samples at 24 h are grouped in a ...
4, the loading of paramagnetic Co2+ broadens NMR peaks but chemical shifts from the CMP matrix can still be identified for the Aza-CMP-Co sample. Fourier transform–infrared (FT–IR) and Raman spectroscopy were used to further confirm the functional groups in Aza-CMP-Co and Aza-CMP-Co (...