A polymorph of 2,4-dinitro-phenyl-hydrazine.
A polymorph of 2,4-dinitro-phenyl-hydrazine.
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DOI：
10.1107/s1600536813004571
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发表时间：
2013-03-01
期刊：
影响因子：
--
通讯作者：
Nishiguchi H
中科院分区：
文献类型：
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作者：
Amimoto K;Nishiguchi H
在90 K下测定了2，4-二硝基苯肼（DNPH）C6 H6 N4 O 4的多晶型物（晶型II）的晶体结构。 第一多晶型物（I型）描述为单斜晶系空间群P21/c [Okabe等人（1993）. Acta Cryst.C49，1678-1680; Wardell等人（2006）. Acta Cryst.C62，o318-320]，而II型在单斜晶系空间群Cc中。I型和II型的分子结构非常相似，2位和4位的硝基几乎与苯环共面[II型的二面角分别为3.54（1）°和3.38（1）°]。 然而，它们的包装方式完全不同。形式I表现出人字形包装基序，而形式II显示共面链结构。形式II中的每个链通过肼NH 2和2-硝基之间的分子间相互作用与相邻链连接，形成垂直于（101）的片层。该薄片通过N-H π相互作用稳定。
The crystal structure of a previously unreported polymorph (form II) of 2,4-dinitrophenylhydrazine (DNPH), C6H6N4O4, was determined at 90 K. The first polymorph (form I) is described in the monoclinic space group P21/c [Okabe et al. (1993). Acta Cryst. C49, 1678–1680; Wardell et al. (2006). Acta Cryst. C62, o318–320], whereas form II is in the monoclinic space group Cc. The molecular structures in forms I and II are closely similar, with the nitro groups at the 2- and 4-positions being almost coplanar with the benzene ring [dihedral angles of 3.54 (1) and 3.38 (1)°, respectively in II]. However, their packing arrangements are completely different. Form I exhibits a herringbone packing motif, whereas form II displays a coplanar chain structure. Each chain in form II is connected to adjacent chains by the intermolecular interaction between hydrazine NH2 and 2-nitro groups, forming a sheet normal to (101). The sheet is stabilized by N—H⋯π interactions.