首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Supramolecular architectures in the salt trimethoprimium ferrocene-1 -carboxylate and the cocrystal 4-amino-5-chloro-2,6-dimethyl-pyrimidine-ferrocene-1-carboxylic acid (1/1)
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Supramolecular architectures in the salt trimethoprimium ferrocene-1 -carboxylate and the cocrystal 4-amino-5-chloro-2,6-dimethyl-pyrimidine-ferrocene-1-carboxylic acid (1/1)

机译:盐三甲基二茂铁-1-1-羧酸甲酯和聚碳酸4-氨基-5-氯-2,6-二甲基 - 嘧啶 - 二茂铁-1-羧酸(1/1)中的超分子架构

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摘要

In the salt trimethoprimium ferrocenecarboxylate [systematic name: 2,4-diamino-5-(3,4,5-trimethoxybenzyl)pyrimidin-1-ium ferrocene-1-carboxylate], (C_14H_19-N_4O_3)[Fe(C_5H_5)(C_6H_4O_2)], (I), of the antibacterial compound trimethoprim, the carboxylate group interacts with the protonated aminopyrimidine group of trimethoprim via two N-H ???O hydrogen bonds, generating a robust R22(8) ring motif (heterosynthon). However, in the cocrystal 4-amino-5-chloro-2,6-di-methylpyrimidine-ferrocene-1-carboxylic acid (1/1), [Fe(C_5H_5)(C_6H_5O_2_]·C_6H_8-ClN_3, (II), the carboxyl-aminopyrimidine interaction [R_2~2(8) motif] is absent. The carboxyl group interacts with the pyrimidine ring via a single O-H ? -N hydrogen bond. The pyrimidine rings, however, form base pairs via a pair of N-H ???N hydrogen bonds, generating an R_2~2(8) supramolecular homosynthon. In salt (I), the unsubstituted cyclopentadienyl ring is disordered over two positions, with a refined site-occupation ratio of 0.573 (10):0.427 (10). In this study, the two five-membered cyclopentadienyl (Cp) rings of ferrocene are in a staggered conformation, as is evident from the C ???Cg???Cg???C pseudo-torsion angles, which are in the range 36.13-37.53° for (I) and 22.58-23.46° for (II). Regarding the Cp ring of the minor component in salt (I), the geometry of the ferrocene ring is in an eclipsed conformation, as is evident from the C???Cg???Cg???C pseudo-torsion angles, which are in the range 79.26-80.94°. Both crystal structures are further stabilized by weak pi-pi interactions.
机译:在盐三甲双胍羧酸甲酸酯[系统名称:2,4-二氨基-5-(3,4,5-三甲氧基苄基)嘧啶-1-Ium二茂铁-1-羧酸酯],(C_14H_19-N_4O_3)[Fe(C_5H_5)(C_6H_4O_2 )](i),抗菌化合物三甲基巯基,羧酸酯基与氢键合的质子化氨基嘧啶基团相互作用,产生稳定的R22(8)环基序(HeteroSynthon)。但是,在Cocrystal 4-氨基-5-氯-2,6-二甲基吡啶氨酸 - 二茂铁-1-羧酸(1/1)中,[Fe(C_5H_5)(C_6H_5O_2_]·C_6H_8-CLN_3,(II),不存在羧基 - 氨基嘧啶相互作用[R_2〜2(8)个图案。羧基通过单个OHα-N氢键与嘧啶环相互作用。然而,嘧啶环通过一对NH形成碱基对。 ?? N氢键,产生R_2〜2(8)超分子Homosynthon。在盐(I)中,未取代的环戊二烯基环在两个位置上混合,精制部位占用率为0.573(10):0.427(10) 。在本研究中,二茂钠的两个五元环戊二烯基(CP)环处于交错的构象,从C ??? CG ??? CG ??? C伪扭转角度(i)和22.58-23.46°的范围为(i)和22.58-23.46°。关于盐(i)中的次要组分的Cp环,二茂铁环的几何形状处于野外的构象,从而可以从中明显看出c ??? cg ??? cg ??? C伪扭转角度,在79.26-80.94°的范围内。通过弱PI-PI相互作用进一步稳定了晶体结构。

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