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Compound (E)-2-(2-hydroxybenzylidene)hydrazinecarbothioamide (salicylaldehyde thiosemicarbazone) (1) is discussed as an isomorphous non-stoichiometric hydrate, that is, while the relative amount of the water guest molecules varies all the crystal structures are “nearly the same” and all the molecular structures of 1 are “the same”. Compound 1 can crystallize isomorphous with no and different non-stoichiometric small amounts of crystal water (0.095, 0.17 and 0.20H2O per formula unit were found). Unit cell dimensions and the crystal packing of the molecules with their hydrogen bonding are virtually unaffected by the presence or absence of the crystal water.
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