Acta Cryst. (2001). C57, 1201-1203 [doi:10.1107/S0108270101011817]
Abstract: The structures of 2-amino-5-methyl-1,3,4-thiadiazole, C3H5N3S, and 2-amino-5-ethyl-1,3,4-thiadiazole, C4H7N3S, have been determined for comparison with unsubstituted 2-amino-1,3,4-thiadiazole. Despite their different space groups (P21/n and Pbca, respectively), the packing modes of the methyl and ethyl derivatives are similar, with comparable three-dimensional hydrogen-bonding associations. This is in contrast to the hydrogen-bonding network in 2-amino-1,3,4-thiadiazole, which is one-dimensional and has denser packing. It is shown that both packing forms are different polymorphs of a specific subunit of each array.
Formula: C3H5N3S and C4H7N3S
Online 12 October 2001
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