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A metastable polymorphic form of the anti-fungal anilino-pyrimidine active pyrimethanil

机译:抗真菌苯胺嘧啶活性嘧啶醇的亚稳态多晶型物

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A second metastable form of the title compound, C12H13N3 (systematic name: 4,6-dimethyl-N-phenyl-pyrimidin-2-amine), was isolated from an attempted co-crystallization experiment with meso-erythriol in dimethyl sulfoxide (DMSO). The crystals of form 2 at 120?K are monoclinic, space group P21 with Z′ = 4 compared to the previously reported triclinic form with Z′ = 2 [Sun et al. (2011). Acta Chim. Sin. 69, 1909–1914]. The four independent mol-ecules in the asymmetric unit form two discrete dimeric units through a concerted pair of N—H?N hydrogen bonds with a graph-set notation of R22(8). The origin of the polymorphic behaviour is revealed in that the conformation of each dimer present in the asymmetric unit of the structure is unique and determined by the rotation of the second mol-ecule in the dimer with respect to the first.
机译:标题化合物的第二种亚稳态形式C12H13N3(系统名称:4,6-二甲基-N-苯基-嘧啶-2-胺)是从尝试与中赤藓醇在二甲基亚砜(DMSO)中共结晶的实验中分离出来的。与先前报道的Z'= 2的三斜晶型相比,在120?K时晶型2的晶体是单斜空间群P21 / n,Z'= 4。 (2011)。 Acta Chim。罪。 69,1909–1914年]。不对称单元中的四个独立分子通过通过协调一致的N-H→N氢键对形成两个离散的二聚体单元,其图形集符号为R22(8)。揭示多晶型行为的原因在于,存在于结构的不对称单元中的每个二聚体的构型是独特的,并且由第二个分子相对于第一个的旋转决定。

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