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- W1986646721 abstract "In order to study the preferred hydrogen-bonding pattern of 6-amino-2-thiouracil, C 4 H 5 N 3 OS, (I), crystallization experiments yielded five different pseudopolymorphs of (I), namely the dimethylformamide disolvate, C 4 H 5 N 3 OS·2C 3 H 7 NO, (I a ), the dimethylacetamide monosolvate, C 4 H 5 N 3 OS·C 4 H 9 NO, (I b ), the dimethylacetamide sesquisolvate, C 4 H 5 N 3 OS·1.5C 4 H 9 NO, (I c ), and two different 1-methylpyrrolidin-2-one sesquisolvates, C 4 H 5 N 3 OS·1.5C 5 H 9 NO, (I d ) and (I e ). All structures contain R 2 1 (6) N—H...O hydrogen-bond motifs. In the latter four structures, additional R 2 2 (8) N—H...O hydrogen-bond motifs are present stabilizing homodimers of (I). No type of hydrogen bond other than N—H...O is observed. According to a search of the Cambridge Structural Database, most 2-thiouracil derivatives form homodimers stabilized by an R 2 2 (8) hydrogen-bonding pattern, with (i) only N—H...O, (ii) only N—H...S or (iii) alternating pairs of N—H...O and N—H...S hydrogen bonds." @default.
- W1986646721 created "2016-06-24" @default.
- W1986646721 creator A5023705098 @default.
- W1986646721 creator A5042293078 @default.
- W1986646721 date "2012-12-15" @default.
- W1986646721 modified "2023-09-27" @default.
- W1986646721 title "Five pseudopolymorphs of 6-amino-2-thiouracil: absence of N—H...S hydrogen bonds" @default.
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- W1986646721 doi "https://doi.org/10.1107/s010827011204930x" @default.
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