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南方科技大学公共卫生及应急管理学院2026级博士研究生招生报考通知(长期有效)
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独处静隅

金虫 (小有名气)

[求助] 翻译求助(小妹这厢有礼啦)

In a study of 2-aminopyrimidine and 2-acetaminopyridine salts and co-crystals, it was concluded that distinction between salts and co-crystals can be made based on ΔDC-O distances from single crystal structures, since a carboxyl anion possesses two similar DC-O values, whereas a neutral carboxyl group possesses two distinctively different DC-O values. For the 2-aminopyrimidine systems, it was concluded that complexes with ∆DC-O<0.03 Å are salts, and complexes with ∆DC-O>0.08 Å are co-crystals.

Recent studies suggested that X-ray photoelectron spectroscopy (XPS) sensitively determines the protonation state of nitrogen functional groups in the solid state, providing a means for distinguishing between co-crystals and salts of organic compounds.The presence of a C=NH peak in XPS allows assignment as a salt, while this peak is clearly absent for a theophylline co-crystal. Protonation of the C=N nitrogen has shifted the peak by 2.3 eV.
小妹英语较差,希望能够得到各位大侠的帮助,在这里先谢谢各位啦。
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独处静隅

金虫 (小有名气)

引用回帖:
2楼: Originally posted by cfk580713 at 2012-03-31 18:28:29:
英到中?还是润色?

想翻译成中文,但英文太差,翻译不好,
3楼2012-03-31 19:01:31
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cfk580713

至尊木虫 (著名写手)

英到中?还是润色?
2楼2012-03-31 18:28:29
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cfk580713

至尊木虫 (著名写手)

【答案】应助回帖

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独处静隅: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 您翻译的很好,非常感谢您!! 2012-04-01 09:06:46
(呵呵 不是太懂,不知道是否合适)
在一项关于2 - 氨基嘧啶和2-乙酰氨基吡啶盐及其共晶的研究中,作者得出结论,可以通过单晶结构中C-O键的键长差别来区分盐及其共晶,因为羧负离子中C-O键的键长是相似的,而在中性的羧基中,两个C-O键长是明显不同的。对2 - 氨基嘧啶体系,当∆DC-O<0.03 Å 时为盐,而当∆DC-O>0.08 Å时为共晶。
近期研究也表明,X射线光电子能谱(XPS)技术可以非常灵敏的检测到固态中
氮官能团的质子化状态,提供了区分有机物共晶及其盐类的另一种方法。XPS中C=NH 峰的出现说明是盐类,而在茶碱的共晶中该信号峰是不存在的。C=N中氮的质子化使得该信号峰发生了2.3 eV的位移.
4楼2012-03-31 20:00:31
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