Interactions during chemical bonding hydrogen bonds

Chemical interactions take place between the solvent and bituminous coal during phenanthrene extraction. The net effect of the interaction is hydrogen excnange between phenanthrene and the coal. The formation of chemical bonds between phenanthrene and coal also occurs to a small extent, as a side reaction. 

These nonspecific interactions (independent of the chemical nature of the solvents) are much easier to consider during modeling than specific interactions like, e.g., hydrogen bonds. Therefore for example reactions of polar species in supercritical water are a special challenge. A recent discussion of different solvent effects in supercritical fluids is given by Kajimoto [25]. 

---