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chenqiao13

木虫 (正式写手)

悬铃木

[求助] 求助大神以下这种情况该怎么办? 已有1人参与

做了一个单晶,但是审稿人一直有意见,请大家帮忙分析下是什么原因,能给出解决方案者必重谢!
下面是两次的审稿意见,拜托了。

第一次的意见
- NOTE:  we checked the CIF file using the International Union of Crystallography facility found at:  http://checkcif.iucr.org/ and found serious alerts (level A) which may indicate errors – see attached checkcif report (PDF file) and comments from our data analyst (below).  Please correct the errors, or add a comment to the CIF file explaining the significance of the alerts.
COMMENTS:
The structure appears to contain two water molecules of crystallisation, however the hydrogen atoms of these water molecules have been attached in a chemically unreasonable way (see the attached picture).  The hydrogen atoms, need to be re-located (it is possible that theye are disordered as the oxygen atoms do not seem to make any sensible H-bond contacts with the main residue.  Otherwise the structure is OK.  

我联系做单晶的老师,那个老师说是因为单晶中有两个水分子造成的,他把水分子去掉后,我再投,审稿人依然有意见,意见如下:
Notes from CIF analyst:
The authors have opted to employ the solvent masking procedure in OLEX (similar to SQUEEZE) which is used to remove the contributions from disordered solvent.  The water oxygens did not appear to be disordered, simply the H atoms were incorrectly placed, but this is their choice. However, if OLEX is applied, then the cif should not only contain details of this procedure, but the unit cell contents should include those atoms which were removed. Failure to do this results in an incorrect F000 and crystal density.  Finally, a note should be added to the refinement_special_details detailing this procedure and why it was applied.


我现在都不知道该怎么办了,做单晶的老师也没有什么办法。请各位高手,大侠救命!感激不尽!
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飞鸟
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yytsnake

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【答案】应助回帖

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chenqiao13: 金币+10, ★★★很有帮助 2014-02-16 19:07:02
第一,两个结晶水的问题是加H位置不合理,应该手动调整其位置,使其处理于化学上合理的位置。
第二,扣除了两个水分子,应该在分子式的表达行里加上两个 O和4个H,以便于计算的电子总数 F000一致。
2楼2014-02-16 13:21:04
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chenqiao13

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悬铃木

引用回帖:
2楼: Originally posted by yytsnake at 2014-02-16 13:21:04
第一,两个结晶水的问题是加H位置不合理,应该手动调整其位置,使其处理于化学上合理的位置。
第二,扣除了两个水分子,应该在分子式的表达行里加上两个 O和4个H,以便于计算的电子总数 F000一致。

感谢您!第一,做单晶的单晶老师说H的位置找不到,可能是单晶养的不够好。那两分子水本不是我的化合物的,是在养单晶的过程中形成的。H的位置找不到,这单晶能用吗?
第二,您的意思是可以去掉两个水分子,但是要在分子式的表达行里加上两个 O和4个H?晶体中把水去掉,单纯在分子式中加上那两分子水?
再次感谢,请大师指条明路!
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3楼2014-02-16 19:07:06
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