Preparation and hydrogen bonding studies of phenylhydrazone derivatives of alloxan: crystal and molecular structure of pyrimidine-2(1H),4(3H),5,6-tetraone 5-(2-nitrophenyl)hydrazone
作者:Haydn G. Beaton、Gerald R. Willey、Michael G. B. Drew
DOI:10.1039/p29870000469
日期:——
Eight phenylhydrazone derivatives of pyrimidine-2(1H),4(3H),5,6-tetraone, or 5-oxobarbituric acid (alloxan), are described. Spectroscopic pyrimidine (1H n.m.r., i.r.) data indicate the presence of extensive hydrogen bonding which, as shown by X-ray crystallographic data for the title hydrazone, includes both intra- and inter-molecular interactions. The title hydrazone, C10H7N5O5, is monoclinic, space
描述了嘧啶-2(1 H),4(3 H),5,6-四酮或5-氧代巴比妥酸(四氧六环)的八种苯hydr衍生物。嘧啶光谱(1 H nmr,ir)数据表明存在广泛的氢键,如标题的X射线晶体学数据所示,该氢键包括分子内和分子间相互作用。标题C 10 H 7 N 5 O 5为单斜晶,空间群P 2 1 / a,a = 9.104(8),b = 17.975(13),c = 10.333(8)Å,β= 113.5( 1)°,Z = 4.2145已在衍射仪上测量了独立反射,并通过直接方法确定了结构,并将其精炼为R 0.074。在不对称单元中有四个独立的氢键:两个分子内键将N(7)–H(7)连接到苯环的o -NO 2基团和巴比妥酸酯环的羰基上,两个分子间键连接通过对称中心将巴比妥酸酯环的NH位点连接至溶剂NN-二甲基甲酰胺氧原子和另一个巴比妥酸酯环的羰基氧原子。