Zhang Z, Xian D, Glidewell C. 4,6-Diaminopyrimidine-2(1H)-thione hemihydrate: a three-dimensional hydrogen-bonded framework.
Acta Crystallogr C 2012;
68:o377-80. [PMID:
23007536 DOI:
10.1107/s0108270112036359]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 08/20/2012] [Indexed: 11/10/2022] Open
Abstract
In the title compound, C(4)H(6)N(4)S·0.5H(2)O, there are two independent pyrimidinethione units, both of which lie across mirror planes in the space group Cmca. Hence, the H atoms bonded to the ring N atoms in each molecule are disordered over two symmetry-related sites, each having an occupancy of 0.5. The water molecule lies across a twofold rotation axis parallel to [010]. The molecular components of (I) are linked by seven independent hydrogen bonds, of N-H···N, N-H···S, N-H···O and O-H···S types. A combination of disordered N-H···N hydrogen bonds and ordered N-H···S hydrogen bonds links the pyrimidinethione units into a continuous tubular structure. The water molecule acts as both a double donor of hydrogen bonds and a double acceptor, forming hydrogen bonds with components of four distinct pyrimidinethione tubes, thus linking these tubes into a three-dimensional structure.
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