Cross-polarization n.m.r. as a tool to investigate solvent-coal molecular interactions
✍ Scribed by Anthony M. Vassallo; Michael A. Wilson
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 319 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
The interaction of pyridine and aniline with an Australian bituminous coal (Liddell) has been studied by cross-polarization 13C nuclear magnetic resonance spectroscopy (CP 13C n.m.r.). The results show that sorbed aniline or pyridine molecules on coal are sufficiently immobilized to cross polarize. Carbonproton static dipolar interactions, however, are weak which suggests that sorbed molecules can rotate rapidly about one or more of their axes of symmetry. It is also established that spin diffusion between coal and sorbed molecules is inefficient. Some loss of conformational rigidity of coal molecules is indicated when coal is soaked with pyridine.