3,5-DIMETHOXYBENZOIC ACID AND THE 2ND POLYMORPH OF THE 2/1-ADDUCT OF 3,5-DINITRO-BENZOIC ACID WITH ETHYLENEDIAMINE

被引:17
作者
LYNCH, DE [1 ]
SMITH, G [1 ]
BYRIEL, KA [1 ]
KENNARD, CHL [1 ]
机构
[1] UNIV QUEENSLAND,DEPT CHEM,BRISBANE,QLD 4072,AUSTRALIA
关键词
D O I
10.1107/S0108270193012259
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
3,5-Dimethoxybenzoic acid, C9H10O4, is planar and forms hydrogen-bonded cyclic dimers [O...O = 2.644 (2) Angstrom]. The second (monoclinic) polymorph of the 2:1 adduct of 3,5-dinitrobenzoic acid with ethylenediamine, ethylenediammonium 3,5-dinitrobenzoate, C2H10N22+.2C(7)H(3)N(2)O(6)(-) [(DNBA)(2)(-)(en)(2+)], is structurally identical to the previously reported triclinic form. It forms a 12-membered hydrogen-bonded ring involving the carboxylate groups of the acids and the protonated amine groups of ethylenediamine. Hydrogen-bond distances (O...N) are 2.678 (2) and 2.729 (2) Angstrom. A nitro group is also involved in a longer intermolecular interaction with an amine group [O...N = 2.898 (2) Angstrom].
引用
收藏
页码:1259 / 1262
页数:4
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