期刊
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS
卷 73, 期 -, 页码 1630-+出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2056989017014359
关键词
crystal structure; molecular salts; stoichiometric ratio; polymorphs
资金
- University of the Witwatersrand Friedel Sellschop Grant
- Molecular Sciences Institute
- National Research Foundation National Equipment Programme [UID: 78572]
Four molecular salts made from hexamethylenetetraminium and 2-chloro-4-nitrobenzoate have been synthesized and are reported, namely ammonium hexamethylenetetraminium bis(2-chloro-4-nitrobenzoate), NH4+center dot C6H13N4+center dot 2C(7)H(3)ClNO(4)(-), (I), hexamethylenetetraminium hydrogen bis(2-chloro-4-nitrobenzoate), 0.5C(6)H(13)N(4)(+)center dot C7H3.50ClNO4-, (II), hexamethylenetetraminium 2-chloro-4-nitrobenzoate, C6H13N4+center dot C7H3ClNO4-, (IIIa) and (IIIb). All four molecular salts show N+-H center dot center dot center dot O- hydrogen bonding. Salt (I) crystallized out with an NH4+ counter-ion which came from decomposition of 50% of the hexamethylenetetraminium cation in solution. (II) shows an unusual asymmetric unit, with both a hexamethylenetetraminium cation and a partially deprotonated 2-chloro-4-nitrobenzoate anion. Salts (IIIa) and (IIIb) are polymorphs of each other. This work shows that hexamethylenetetramine only protonates once, even in the presence of excess acid.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据