Zahf's analysis of the H NMR of Caffeine. By Zahf Shaikh. Figure 1- H NMR spectra for caffeine. Figure 2- In this figure, three singlets are observed. NMR Studies of Hetero-Association of Caffeine. The first peak between 3. The peak between 3. The third peak between 3. The deshielding due to the nitrogens near all the hydrogens causes the shift in the spectra. This is most evident in the third peak because the hydrogens are located near a carbon that is attached to a nitrogen near two carbons with double bonded oxygens. ![]() ![]() Deuterium NMR Structure of Retinal in the Ground State of Rhodopsin. Nuclear Magnetic Resonance (NMR) Spectroscopy. Coupling = Due to the proximity of 'n' other equivalent H atoms, causes the signals to be split into (n+1) lines. Calculated 1 H-NMR and 13 C-NMR spectra. Interpreting 1H (Proton) NMR Spectra 1. How many signals will the H NMR spectrum produce for this molecule? On the characteristic proton NMR chemical shifts table. Predict 1D 1 H NMR spectra; Predict 1D 13 C NMR spectra; Predict COSY spectra; Predict HSQC / HMBC spectra; Simulated second order effect in 1 H NMR spectra. Quantitative determination of caffeine. Figure 3- In this figure, one peak is observed due to the solvent used to conduct the H NMR. A D2. O was used and caused this large peak between 4. Figure 4- In this figure, one peak is observed due to the hydrogen proton located on the carbon between the two nitrogen groups. The deshielding due to the carbons are located next to nitrogen that cause a great shift in the spectra. After checking the intergration data, it is apparent that one hydrogen is represented by this peak. ![]() ![]() ![]() ![]()
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