NMR spectroscopy

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NMR spectroscopy

nuclear magnetic resonance spectroscopy.
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The number of repeating units or degree of polymerization was obtained from the [sup.1]H NMR spectra. The conversion rate was also calculated using [sup.1]H NMR spectra for each depolymerization reaction and applied to the diffusion ordered spectroscopy [sup.1]H NMR (DOSY-NMR) technique to determine the composition of the products.
Figure 1 shows the stacking of [sup.1]H NMR spectra as obtained from the titration of L with S[O.sub.4.sup.2-] (0-10 eq.).
Likewise, the NMR spectra generated for characterization of isorhamnetin are annexed as supporting material 7-9.
The [sup.1]H NMR spectra were acquired using 64 K data points with a spectral width of 12019 Hz, the acquisition time of 2.73 s, the relaxation delay of 1 s, 16 scans, and a pulse width of 30[degrees].
NMR spectra were recorded at 500 MHz for [sup.1]H and 125MHz [sup.13]C on JNM-ECX500 system (JEOL Ltd.).
Figure 2 shows the [sup.1]H NMR spectra of the precursor and the azo polymers with assignments.
The matrix X of dimensions z x s contains the recorded NMR spectra as rows with the respective intensity values.
A complete assignment of [sup.1]H and [sup.13]C NMR spectra of the hydrazones was based on analysis of NMR and 2D spectra (the HMBC correlations of 4b and 4e compounds were shown in the structures at Tables 2 and 3) and is presented in Tables 2 and 3.
[sup.13]C MAS NMR spectra confirmed the disappearance of carbonyl groups when the precursor was heated at 400[degrees]C; this is in agreement with the results of IR analyses.