...
首页> 外文期刊>Steroids: An International Journal >Physicochemical characterization of deflazacort: thermal analysis, crystallographic and spectroscopic study.
【24h】

Physicochemical characterization of deflazacort: thermal analysis, crystallographic and spectroscopic study.

机译:十烷的理化特性:热分析,晶体学和光谱学研究。

获取原文
获取原文并翻译 | 示例
           

摘要

The solid state properties of deflazacort (1-(1beta,16alpha)-21-(acetyloxy)-11-hydroxy-2'-methyl-5'H-pregna-1,4-dien o[17,16-d]oxazole-3,20-dione, 1) were investigated using differential scanning calorimetry (DSC), thermogravimetry (TG), single-crystal X-ray diffraction, solid and liquid nuclear magnetic resonance spectroscopy ((13)C NMR), Fourier transform infrared and Raman spectroscopy (FTIR and FT Raman). From the trends observed in the crystal structure and spectral data some conclusions can be made about hydrogen bonding, molecular conformation and crystal packing. Compound 1 crystallizes in an orthorhombic cell, space group P2(1)2(1)2(1) and the following lattice parameters: a=11.2300(5), b=12.8161(8), c=16.171(1)A, V: 2327.4(2)A(3), D(c): 1.260g/cm(3), R1=0.0479, wR2=0.1012. The crystal structure is stabilized by intra and intermolecular interactions, which provides for a very closely packed form. The NMR data indicated that 1 shows a similar conformation in solid and liquid state; while, thermal data revealed that 1 follows a monophasic pattern with a DSC melting peak at 258.4 degrees C (DeltaH 99.7Jg(-1), n=3), indicating that 1 is thermally stable as solid; but, as liquid is unstable to undergo a thermal decomposition reaction. The reactivity of 1 toward light and moisture was examined via DSC and TLC. The data indicated that 1 do not interact with water to give hydrated forms or decomposition products; however, light degrades 1.
机译:十烷酮(1-(1beta,16alpha)-21-(乙酰氧基)-11-羟基-2'-甲基-5'H-pregna-1,4-dien o [17,16-d]恶唑的固态性质-3,20-dione,1)使用差示扫描量热法(DSC),热重法(TG),单晶X射线衍射,固液核磁共振波谱((13)C NMR),傅立叶变换红外光谱进行了研究和拉曼光谱(FTIR和FT拉曼光谱)。从晶体结构和光谱数据中观察到的趋势,可以得出关于氢键,分子构象和晶体堆积的结论。化合物1在正交晶胞,空间群P2(1)2(1)2(1)和以下晶格参数中结晶:a = 11.2300(5),b = 12.8161(8),c = 16.171(1)A, V:2327.4(2)A(3),D(c):1.260g / cm(3),R1 = 0.0479,wR2 = 0.1012。晶体结构通过分子内和分子间相互作用而稳定,这提供了非常紧密的堆积形式。 NMR数据表明,1在固态和液态下显示出相似的构象。同时,热数据显示1遵循单相模式,DSC熔融峰位于258.4摄氏度(DeltaH 99.7Jg(-1),n = 3),表明1作为固体具有热稳定性。但是,由于液体不稳定,容易发生热分解反应。通过DSC和TLC检查1对光和湿气的反应性。数据表明1不与水相互作用产生水合形式或分解产物;但是,光会降低1。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号