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mwwanghao

至尊木虫 (著名写手)

[交流] 求助一个a问题

PLAT731_ALERT_1_A Bond    Calc     0.84(4), Rep  0.8400(11) ......       9.90 su-Ra
              O2   -H2      1.555   1.555   

--------------------------------------------------------------------------------
PLAT731 Type_1 Test for consistency of Bond su's and Coordinate su's in CIF
--------------------------------------------------------------------------------

A large ratio of the reported and calculated bond s.u.'s is found.
The use of a DFIX instruction might cause such a warning since
calculated s.u.'s are based on reported variances only.
Note_1: su's on the unitcell dimensions are taken into account in the
calculation of expected su's. This may result in large differences
between expected and reported su's when this contribution is not included
in the reported su's, in particular for inaccurate unitcells.
Note_2: Another source for the discrepancy between calculated and
reported su's can be that the validation software has access only to
the variances of the refined parameters as opposed to the full co-variance
matrix used by e.g. SHELXL for the calculation of derived parameters
with associated su's. Constrained/restrained refinement may cause largei
co-variances.  

请问怎么解决这个问题呢?多谢高手们的指点
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zhousm

木虫 (正式写手)

★ ★ ★
mwwanghao(金币+2,VIP+0):多谢指点 10-20 12:32
eeqeeq0002(金币+1,VIP+0):谢谢 参与 10-28 09:08
用difx 0.84 0.001 时, 因为计算的值的s.u. 远大于0.001,报A类错误。
听xi2004没错,先把这个A类错误消了。

如果用afix 3,就直接告诉editor:你已经把O2-H2 distance 固定到0.84了,
与此同时可以看到这个A类错误已消失了。
5楼2009-10-20 12:14:45
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mwwanghao

至尊木虫 (著名写手)

编辑的问题:
The O2-H2 distance should also be restrained to 0.84 A.
------------------------------------------------------------------------

Please let me know your response to these comments taking into account the following comments from me:
该怎么回复呢?o2是羧基上的氧原子
2楼2009-10-20 10:08:29
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xi2004

至尊木虫 (职业作家)

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mwwanghao(金币+2,VIP+0):谢谢,我用的是dfix 0.84 0.001,用你这个确实没有错误了,但是键长是0.83,不是0.84啊,怎么回复编辑呢? 10-20 11:55
mwwanghao(金币+5,VIP+0):谢谢xi老师的邮件,非常感谢 10-21 23:34
eeqeeq0002(金币+1,VIP+0):谢谢 参与 10-28 09:08
0.84(4), Rep  0.8400(11) ......      

用dfix 0.84 0.04 O2 H2, 然后重新修正.

你是不是用了dfix 0.8400 0.001; 按我说的改.
或者就用AFIX 3了, 不要用dfix 了.
xi2004-emuch@163.com
3楼2009-10-20 11:50:00
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mwwanghao

至尊木虫 (著名写手)

我用的是dfix 0.84 0.001,用你这个确实没有错误了,但是键长是0.83,不是0.84啊,怎么回复编辑呢?
4楼2009-10-20 11:55:33
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