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lc666

金虫 (小有名气)

[求助] 求助晶体投稿修改意见

本人刚投一篇晶体学报E
编辑给了一些修改意见,请教高手指点:
>1. Your molecule contains no strong anomalous scatterers (atoms with Z>13).
>Therefore, the Flack parameter' value is inconclusive and can not be refined.
>You need to merge Friedel pairs, and  continue the refinement,
>prepare new CIF and new FCF.
>You should mention it in Experimental section.
>As example:
>
>_publ_section_exptl_refinement
>;
>...
>In the absence of any significant
>anomalous scatterers in the molecule, attempts to confirm the absolute
>structure by refinement of the
>Flack parameter in the presence of 1479 sets of Friedel
>equivalents led to an inconclusive value of -1.1(17). Therefore, the Friedel pairs were
>merged before the final
>refinement and the absolute configuration was assigned to
>correspond with that of the known chiral centres in a precursor
>molecule,
>which remained unchanged during the synthesis of the title compound.
后面这一块是不是加到实验部分里面去

2. Edit properly the Comment, which contains a number of misprints.
>Compare your crystal structure with the crystal structures of
>related compounds - Cambridge database contains a number
>of such compounds
这一条好像是让我比较同类型的晶体结构,想请教怎么比较晶体的结构?
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lc666

金虫 (小有名气)

引用回帖:
Originally posted by xi2004 at 2011-04-27 08:16:07:
1. 是这样。
但你要按他说的,在.ins中加merg 3, 把 Friedel 对 merg 掉,再重新修正
然后, 如果你确实能根据反应原料来确定绝对构型, 则实验部分就按编辑给的例子那样写。 如果无法确定绝对构型, 则就如实 ...

非常感谢
3楼2011-04-27 10:48:37
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xi2004

至尊木虫 (职业作家)

【答案】应助回帖

lc666(金币+5): 2011-04-27 10:47:57
1. 是这样。
但你要按他说的,在.ins中加merg 3, 把 Friedel 对 merg 掉,再重新修正
然后, 如果你确实能根据反应原料来确定绝对构型, 则实验部分就按编辑给的例子那样写。 如果无法确定绝对构型, 则就如实写无法确定。
同时, 在cif中增加
_chemical_absolute_configuration syn(或 unk)
上述第一种情况填 syn, 未确定,填 unk
详细见
http://www.iucr.org/__data/iucr/ ... _configuration.html

而且, 还要把 falck参数那一行删除

2. CCDC中查询到类似结构, 引用、比较。 一般先比较键长,键角,然后比较整体结构。
xi2004-emuch@163.com
2楼2011-04-27 08:16:07
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