CheckCIF-PLAT220-224
PLAT220 Type_2 Test Ueq(max)/Ueq(Min) range for non-H atoms in non-solvent
This test reports on a larger than usual U(eq) range for the specified element type in the non-solvent/anion part of the structure. Too high or too low Ueq's may be an indication for incorrectly identified atomic species (i.e. O versus N).
(http://journals.iucr.org/services/cif/checking/PLAT220.html)
例1:PLAT220_ALERT_2_B Large Non-Solvent C Ueq(max)/Ueq(min) ... 3.83 Ratio
例2:PLAT220_ALERT_2_A Large Non-Solvent O Ueq(max)/Ueq(min) ... 7.95 Ratio
警告原因:非溶剂的碳原子或者氢最大温度因子和最小温度因子相差过大。
解决策略:一般都是末端基团及所连的氢温度因子过大,做无序处理即可,无法解决做合理解释即可。或者使用“SIMU 0.01 0.02 3.8 $C”命令(SIMU限制在一定范围内的原子具有相同的位移参数,0.01 0.02必须成倍数关系)。如果是衍射数据质量不够好而无法得到好的修正结果,那只有重新采集数据了。
PLAT221 Type_2 Test Ueq(max)/Ueq(Min) range for non-H atoms in solvent
This test reports on a larger than usual U(eq) range for the non-hydrogen atoms solvent/anion. Too high or too low Ueq's may be an indication for incorrectly identified atomic species (i.e. Br versus Ag).
此检查报告溶剂/阴离子中非氢原子超出范围的U(eq)值。Ueq值过高或过低可能表明原子类型指认错误(即Br与Ag)。
(http://journals.iucr.org/services/cif/checking/PLAT221.html)
警告原因:结构中存在U(eq)值超出范围的非氢原子。
解决策略:检查是否有原子指认错误,否则可能需要做无序处理。无法解决做合理解释即可,也可以尝试低温收集数据。
PLAT222 Type_3 Test Uiso(max)/Uiso(Min) range for H atoms in non-solvent
This test reports on a larger than usual range of U(eq) values for hydrogen atoms in the non-solvent/anion part of the structure. Possible causes are:
1 - disorder, e.g. in t-butyl moieties.
2 - poor data, not adequate for the refinement of individual displacement parameters.
3 - Misplaced hydrogen atoms (i.e. there is no density at the position where one of the H-atoms is positioned).
(http://journals.iucr.org/services/cif/checking/PLAT222.html)
例:PLAT222_ALERT_3_A Large Non-Solvent H Ueq(max)/Ueq(min) ... 7.78 Ratio
警告原因:非溶剂的碳原子或者氢最大温度因子和最小温度因子相差过大。
解决策略:一般都是末端基团及所连的氢温度因子过大,做无序处理即可,无法解决做合理解释即可,也可以尝试低温收集数据。
PLAT223 Type_4 Test Ueq(max)/Ueq(Min) range for H atoms in solvent
This test reports on large ranges in displacement parameters for hydrogen atoms in the solvent/anion part of the structure.
此检查报告结构中溶剂/阴离子部分中位移参数超出范围的氢原子。
(http://journals.iucr.org/services/cif/checking/PLAT223.html)
警告原因:溶剂/阴离子中氢最大温度因子和最小温度因子相差过大。
解决策略:可能需要做无序处理。若无法解决做合理解释即可,也可以尝试低温收集数据。
PLAT224 Type_1 Test for difference in implicit and explicit U(eq)
This test reports on a large difference between Ueq in the CIF and the Ueq calculated from the 6 reported Uij values.
此检查报告CIF中的Ueq与根据6个报告的Uij值计算得到的Ueq之间的巨大差异。
(http://journals.iucr.org/services/cif/checking/PLAT224.html)
警告原因:所报告的Ueq与根据6个报告的Uij值计算得到的Ueq之间存在巨大差异。
解决策略:一般不会出现,重新精修生成CIF即可。