1976
DOI: 10.1016/0040-4020(76)85122-8
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A 14N NMR study of the isomeric structures of urea and its analogues

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Cited by 18 publications
(42 citation statements)
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“…However, FTIR measurements on similarly prepared arginine samples in undeuterated water at pH 7 and 14 (not shown) exhibited the same features as in previously published IR spectra of aqueous arginine. 14 Figure 3 shows the 15 (63.8 ppm). When the pH is increased to ∼14.1 ( Figure 3B), the R-amino 15 N shifts upfield 8 ppm to 12.3 ppm, due to the increased diamagnetic shielding generally expected for a primary amine upon deprotonation.…”
Section: Methodsmentioning
confidence: 98%
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“…However, FTIR measurements on similarly prepared arginine samples in undeuterated water at pH 7 and 14 (not shown) exhibited the same features as in previously published IR spectra of aqueous arginine. 14 Figure 3 shows the 15 (63.8 ppm). When the pH is increased to ∼14.1 ( Figure 3B), the R-amino 15 N shifts upfield 8 ppm to 12.3 ppm, due to the increased diamagnetic shielding generally expected for a primary amine upon deprotonation.…”
Section: Methodsmentioning
confidence: 98%
“…Thereafter, a dry N 2 stream was used to evaporate the C 2 HCl 3 , which could be removed essentially quantitatively. The remaining ∼1 M solution of dodecylguanidine in DMSO was used directly for 15 FTIR Measurements. FTIR spectra ( Figure 2) were obtained primarily to confirm the protonation states of the NMR samples.…”
Section: Methodsmentioning
confidence: 99%
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“…The differential saturation technique based on an audio-frequency modulation (about 2 MHz) was employed as described elsewhere. 12,13 This was combined with the relevant line-shape fitting function as previously rep~rted. '"~ In this procedure, corrections were employed for the position of the audio-modulation side-band spectra generated in this technique, together with the central band spectrum.…”
Section: Methodsmentioning
confidence: 99%
“…The additive rules used by Webb and coworkers were extended for azoles to account for the introdution of sulfur (25).…”
Section: Nitrogen-1s Chemical Shiftsmentioning
confidence: 99%