The 5-(isopropylidene)-2-thiobarbituric acid: Preparation, crystal structure, thermal stability and IR-characterization
作者:Nicolay N. Golovnev、Maxim S. Molokeev、Liudmila S. Tarasova、Victor V. Atuchin、Natalya I. Vladimirova
DOI:10.1016/j.molstruc.2014.04.024
日期:2014.6
crystals have been investigated using X-ray single crystal and powder techniques and characterized by differential scanning calorimetry, thermogravimetry and infrared spectroscopy. The compound crystallizes in the monoclinic system with a = 8.8268(19) A, b = 12.044(3) A, c = 8.0998(19) A, β = 105.388(6)°, Z = 4, V = 830.2(3) A3, space group P21/c. The geometric parameters of the heterocycle of the molecule
摘要 5-(异亚丙基)-2-硫代巴比妥酸 (1),C7H8N2O2S,已通过 2-硫代巴比妥酸与过量丙酮在环境条件下反应 5-6 天而结晶。已使用 X 射线单晶和粉末技术研究了淡黄色晶体,并通过差示扫描量热法、热重法和红外光谱法对其进行了表征。该化合物在单斜晶系中结晶,a = 8.8268(19) A, b = 12.044(3) A, c = 8.0998(19) A, β = 105.388(6)°, Z = 4, V = 830.2(3) A3,空间群 P21/c。分子 1 的杂环的几何参数类似于先前在 2-硫代巴比妥酸的多晶型修饰中发现的硫代二羰基互变异构体分子的几何参数。红外光谱也证明了 1 杂环的亚硫代二羰基结构。分子间 NH⋯O 氢键沿 b 轴将分子链中的分子连接起来。1 化合物在高达 230.0 °С 的温度下具有热稳定性,并在 261.4 °C 时熔化并分解。质谱分析结果与X射线衍射法发现的结构参数一致。