Crystal fragmentation 592 INDEX

Recently Fabian and Kalman highlighted certain limitations in the above indices, proposing that the degree of isostructurality of two or more structures be based instead on the extent of their volume overlap.They accordingly defined a "volume isostructurality index" represented by the ratio of the volume overlap of the two compared fragments and their average volumes. This parameter, computed over the entire unit cell, has merit in that it can be used selectively on two or more related inclusion compounds to measure the levels of isostructurality between the entire crystal structures, the hosts alone, or the guests alone. 

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