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haru007

木虫 (著名写手)

[交流] 求助A类错误

PLAT432_ALERT_2_A Short Inter X...Y Contact  O6     ..  C2      ..       2.66 Ang.
PLAT432_ALERT_2_A Short Inter X...Y Contact  O9     ..  C3      ..       2.69 Ang.
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haru007

木虫 (著名写手)

谢谢!有没有知道具体怎么改这个错误啊?

再次感谢!
3楼2008-08-17 09:09:32
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xi2004

至尊木虫 (职业作家)


lingzi326(金币+1,VIP+0):谢谢热心回复~~~
其实用online的 http://checkcif.iucr.org/ 做检查时,
在每个错误的叙述开头, 都有蓝色的字, 完全可以打开侃侃而谈这些错误说的是啥?

比如

PLAT232_ALERT_2_C
---------------------------

点开后有下列叙述.

PLAT232

--------------------------------------------------------------------------------
PLAT232 Type_2 Hirshfeld Rigid-Bond Test (Metal-X) (Acta Cryst (1976),A32,239-244
--------------------------------------------------------------------------------

The components of the anisotropic displacement parameters along chemical
bonds are assumed to be equal in magnitude. Large differences supposedly
indicate contamination of these parameters with other (unresolved) effects
such as (substitutional) disorder, model or data errors and/or
over-refinement. Atomic sites assigned the wrong scattering type (e.g. Ag
versus Br) should generate 'problem signals' with this test. Data sets
corrected for absorption effects with DELREF techniques (e.g. DIFABS, SHELXA,
XABS2) often show large DELU values for bonds involving the heaviest atom.
Note: The original 'Hirshfeld-test' was defined in absolute terms (see
F.L.Hirsfeld, Acta Cryst. (1976). A32, 239-244). The current test is with
reference to the associated standard uncertainty.
xi2004-emuch@163.com
2楼2008-08-17 00:02:11
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xi2004

至尊木虫 (职业作家)

是说分子间的C和O的距离太近了吧? 看看原子类似有没有搞错, 或者有没有无序的情况.
xi2004-emuch@163.com
4楼2008-08-17 14:25:48
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