Proton nuclear magnetic resonance spectroscopy

The synthesis of the complex is followed by the most important step of characterization of the complex. The composition and the structural features of both the ligand and complex have to be established before embarking on further studies. There exist many methods by which the composition and structural features of the complexes are studied. Some of the methods are (i) elemental analysis, (ii) X-ray crystallography, (iii) UV-Vis absorption spectra, (iv) infrared spectroscopy, (v) Raman spectroscopy, (vi) thermal methods of analysis such as thermogravimetry, differential thermal analysis, (vii) nuclear magnetic resonance spectroscopy (proton, multinuclear), (viii) electrospray mass spectrometry. Depending upon the complexity of the system, some or all the methods are used in the studies of complexes. 

One of the most powerful tools available to us for characterization of these fractions is nuclear magnetic resonance spectroscopy. Proton and 13C Fourier transform nmr spectra were run in deuterochloroform on these same asphaltene and maltene samples and some of the spectra are shown in Figures 7 and 8. One of the first interesting points we find is that the asphal-... 

TECHNIQUE 26 Nuclear Magnetic Resonance Spectroscopy (Proton NMR) 897... 

Similar methods are available that are based on solid-state proton nuclear magnetic resonance spectroscopy. Proton methods are less discriminating than the equivalent carbon-13 method, being based on a two-phase model of semicrystalline morphology. In their favor, they are several orders of magnitude faster than the carbon-13 method and the equipment required is much cheaper. 

---