title: 2-Amino-6-(1-imidazolylmethyl)-4-(3,5,5-trimethyl-2-pyrazolin-1-yl)-1,3,5-triazine and 2-amino-6-(1-benzimidazolylmethyl)-4-(3,5,5-trimethyl-2-pyrazolin-1-yl)-1,3,5-triazine hemihydrate.
abstract: The two title compounds, C(13)H(18)N(8) and C(17)H(20)N(8).0.5H(2)O, possess similar molecular shapes, with the pyrazoline moiety and s-triazine ring located approximately in one plane, and the imidazole or benzimidazole ring nearly perpendicular to the s-triazine nucleus. In both crystal structures, despite there being a large number of accessible hydrogen-bond acceptor sites, only one H atom from the NH(2) group is involved in hydrogen bonding; the molecules are assembled into discrete centrosymmetric dimers via a pair of nearly linear N-H.N hydrogen bonds.
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Poland. magdan@amu.edu.pl
authors.forename: Maria
authors.initials: M
authors.lastname: Gdaniec
authors.forename: Franciszek
authors.initials: F
authors.lastname: Saczewski
authors.forename: Zdzisław
authors.initials: Z
authors.lastname: Brzozowski