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3. Although there is no sharp organic/molecular restriction for cocrystals and several ionic cocrystals were known (Beevers C A and Cochran W 1946 Nature 157 872; Braga D, Grepioni F, Maini L, Prosperi S, Gobetto R and Chierotti M R 2010 Chem. Commun. 46 7715), majority of the definitions on cocrystal[1]k state it to be a multi-molecular entity and it had been termed as ‘molecular compound’, ‘molecular complex’, ‘molecular crystal’, ‘heteromolecular crystal’ etc. (Stahly G P 2009 Cryst. Growth Des. 9 4212). Molecular salt and cocrystal as the two extremes of the salt–cocrystal continuum, with the former being the ionized entity and the latter an un-ionized one, were well appreciated in the literature.[1]b,c,o,p
4. The analogy between cocrystal and intermetallic compound brought herein should be considered in a supramolecular/structural sense and not at atomic/ molecular level where the bonding is different. Both cocrystal and intermetallic compound have distinct structural integrity as compared to their respective parent materials.
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