title: 2-Amino-5-methyl-1,3,4-thiadiazole and 2-amino-5-ethyl-1,3,4-thiadiazole.
abstract: The structures of 2-amino-5-methyl-1,3,4-thiadiazole, C(3)H(5)N(3)S, and 2-amino-5-ethyl-1,3,4-thiadiazole, C(4)H(7)N(3)S, have been determined for comparison with unsubstituted 2-amino-1,3,4-thiadiazole. Despite their different space groups (P2(1)/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.
authors.affiliation: School of Science and the Environment, Coventry University, Coventry CV1 5FB, England. apx106@coventry.ac.uk
authors.forename: D E
authors.initials: DE
authors.lastname: Lynch