Pulse sequences which generate multiple- and zero-quantum coherence and suppress the detection of single-quantum coherence have been used to reduce greatly the intensity of the water peak in 1H NMR spectra of biological interest. In addition to suppressing the strong water signal, other resonances ...
Those remarks also apply to other NMR problems solved previously with the continuous wavelet transform, such as quantification or dynamical phase correction. 展开 关键词: wavelets Gabor transform peak suppression time-frequency analysis time-scale analysis ...
Infrared spectroscopy (IR) is the technique which has been most widely used to measure the water concentrations in NAMs, but it requires the extinction coefficients (the constants which relate the size of an IR peak to the concentration of dissolved hydroxyl) to be known. In the absence of ...
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;...
The peak assignment is given for both the 1H- and 13C-NMR spectra. From the speciation data, obtained from the peak area fractions, numbers for the chemical equilibrium constants of the oligomer formation are obtained and a correlation is presented. 2014 American Institute of Chemical Engineers ...
The mechanism of incorporation of water in silica (SiO2), albite (NaAlSi3O8), and Na2Si4O9 composition glass has been studied by 1H, 17O, 23Na, 27Al, and 29Si NMR spectroscopy. Hydrated samples were prepared by quenching the melt from hi... H Maekawa,T Saito,T Yokokawa - 《Journ...
ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) (Fig.2a). In1H-NMR spectra of the intermediate cellulose 2-chloropropionate (Cell-Cl) with different degrees of substitution (DSCl) (Supplementary Fig.1a), the peak at 1.5–1.7 ppm is assigned to the methyl protons. In their FTIR ...
We present a 17O and 1H NMR study of molecular endofullerene H2O@C60 dissolved in the nematic liquid crystal N-(4-methoxybenzylidene)-4-butylaniline (MBBA). The 17O NMR peak is split into five components by the 17O residual quadrupolar coupling, each of which is split into a triplet by...
12 explains the reason for avoiding the strongly acidic Nafion binding glue in our test system)30. The level of redox-active Co2+ sites on the electrode was calculated according to the linear relationship between the peak current of Co2+/3+ and scan rate30,31,32. Aza-CMP-Co contains ...
Signal peaks were obtained from the Felix peak picking function. The pKa values of the histidine Cϵ1H signals were determined by nonlinear least squares fit with (Markley, 1975),(1){formula not available us MathML}In this expression, δ+ and δo refer to the value of the chemical ...