Another area of particular interest is the identification of crystal structures that do not correspond to the thermodynamically most stable structure, but occupy sufficiently deep energy basins to be isolable and kinetically stable. Knowing about such structures is important for anticipating polymorphism that could occur through crystallization routes where kinetics can lead the crystal structure away from the thermodynamically preferred, global energy minimum. One example of such a process is the desolvation of solvate crystal structures , where solvent incorporated into the crystal structure stabilizes an alternative arrangement of molecules, so that removal of solvent leaves the structure in a metastable polymorph. Some recent studies have identified very high energy polymorphs through desolvation of solvates. The importance of these structures is demonstrated by their very attractive properties, such as for high capacity for gas storage, selectivity for molecular separations and high photocatalytic activity .