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3-(1H-Imidazol-1-yl)propanaminium picrate

机译:3-(1H-咪唑-1-基)丙酸铵

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摘要

In the title salt [systematic name: 3-(1H-imidazol-1-yl)propanaminium 2,4,6-tri-nitro-phenolate], C6H12N3+·C6H2N3O7?, there are five independent cation–anion pairs (A, B, C, D, E) in the asymmetric unit. In the cation, the ammonium group is protonated with the amino-propyl group nearly at right angles to the mean plane of the imidazole ring showing C—N—C—C torsion angles ranging from 79.6?(2) to 99.79?(19)° in the five cations. The nitro groups in the anion are twisted from the benzene mean plane with maximum dihedral angles subtended by nitro substituents ortho to the phenolate O atom of 26.0?(2) and 37.3?(7) (A), 28.9?(5) and 35.3?(1) (B), 34.7?(7) and 36.9?(7) (C), 14.7?(4) and 36.9?(2) (D) and 33.1?(1) and 35.4?(3)° (E). In contrast, the nitro groups in the para positions lie much closer to the aromatic ring plane, subtending dihedral angles of 1.8?(3) (A), 3.5?(3) (B), 6.03 (C), 2.1?(3) (D) and 7.7?(1)° (E). Disorder is observed for one O atom of an ortho nitro group in anion D with an occupancy ratio of 0.53?(5):0.47?(5). In the crystal, N—H?O cation–anion and N—H?N cation–cation hydrogen bonds are observed, linking the ions into chains along [010]. In addition, weak C—H?O cation–anion inter-actions occur.
机译:在标题盐[系统名称:3-(1H-咪唑-1-基)2,4,6-三硝基酚盐],C6H12N3 +·C6H2N3O7?中,有五个独立的阳离子-阴离子对(A,B ,C,D,E)中的不对称单位。在阳离子中,铵基几乎与咪唑环的平均平面成直角,氨基丙基被质子化,表现出C–N–C扭转角,范围为79.6°(2)至99.79°(19)。在五个阳离子中的°。阴离子中的硝基以最大的二面角由苯平均平面扭曲,该二面角由硝基取代基对接,邻苯二酚的O原子为26.0?(2)和37.3?(7)(A),28.9?(5)和35.3。 (1)(B),34.7(7)和36.9(7)(C),14.7(4)和36.9(2)(D)和33.1(1)和35.4(3)° (E)。相反,对位的硝基更接近芳环平面,对角为1.8°(3)(A),3.5°(3)(B),6.03(C),2.1°(3 )(D)和7.7?(1)°(E)。在阴离子D中观察到邻硝基的一个O原子的无序,占有率为0.53≤(5)∶0.47≤(5)。在晶体中,观察到NH阳离子和NH阳离子的氢键,将离子沿[010]链接成链。此外,还会发生弱的CHOH阳离子与阴离子的相互作用。

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