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北京石油化工学院2026年研究生招生接收调剂公告
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蝶舞天晴

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[求助] 急需各位高手帮助,谢谢啦!有关晶体cif的问题,急!急!急!!!

这是一个审稿人的意见,由于对晶体不是很了解,请大家帮我看看到底是怎么回事,要怎么改,谢谢!
In the case of severe disorder or high thermal motion, it is always recommended low temperature measurement. Especially such methods as SQUEEZE, which, in coincidence with SHELXL-97, "massages" the data, should be avoided. So my recommendation is, IF using SQUEEZE, only when low temperature measurement is not available, and in coincidence with better suited refinement software (Crystals, Olex2, SHELXL-2012) thus avoiding "data massaging". My recommendation is low-temperature remeasurement.
Also, there are signs of underexposition in all 3 cases, signalised by A alert about Rint value from checkcif (why authors didn't provide checkcif reports?) and extremely low GooF value. In the compound no. 1, there are B level alerts about bad H bonds connectivity, and also formal errors in the CIF.
Mistakes, omissions and typos are also in the CIF of compound no. 2. There isn't any mention about using SQUEEZE, which is considered unethical.
Please note that original and squeezed structural factors should be both submitted. Generally, I recommend submitting also structural factors to the CSD (see http://journals.iucr.org/e/issues/2010/01/00/me0406/index.html).
Problem with H atom placement is also in the compound 3 indicated by B alert (in coincidence with C and G warnings), together with more "formal" alerts of low importance (but all of them could be corrected!). There are again some signs of underexposition and thus too high PSNR value

[ Last edited by 蝶舞天晴 on 2013-3-6 at 16:08 ]
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lijunjie84

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updayday: 金币+1, 感谢您的热心参与 2013-03-07 16:23:16
你没有给审稿人checkcif的文件,审稿人估计去check了,你结构的R值比较高,goof又不接近1,可能会有A类错误,这样结果是值得商榷的。
可以删除溶剂分子试一试!这需要你在使用Squeeze 前先将结构解析完全,再用platon ,squeeze,接着精修,精修完成后把产生的sqz文件中的说明复制到cif,再去check cif,这样也许可以解决这一问题!不过审稿人的建议是对的!

[ Last edited by lijunjie84 on 2013-3-6 at 20:21 ]
3楼2013-03-06 20:19:21
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lijunjie84

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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
蝶舞天晴: 金币+20, ★★★很有帮助, 这个文章里共这三个晶体,现在关键问题是我没有晶体了,想请问下,我的晶体的无序都是溶剂造成的,能不能修修,使用了Squeeze,删除溶剂,可以达到效果吗?谢谢 2013-03-06 18:52:28
你的数据信噪比太小,无序严重,不要随便删改数据,审稿人建议做低温测试!
2楼2013-03-06 16:49:22
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xi2004

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lijunjie84: 金币+1, 感谢xi老师给予的中肯答案! 2013-03-07 17:06:00
lijunjie84: 金币+1, 应助指数+1 2013-03-07 17:06:11
lijunjie84: 回帖置顶 2013-03-07 17:06:16
这个就比较难办了。
投到哪里去了?

审稿人是建议你先做低温测试看看。 他/她不赞成用squeeze.
这个比较难解决。

其他的问题也是数据的问题。
另外,解析方面也有问题。
xi2004-emuch@163.com
4楼2013-03-07 09:04:37
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