首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structure refinement of a twinned pseudo-symmetric crystal of [Mn(C10H24N4)(NCO)](2)](+)center dot ClO4-
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Structure refinement of a twinned pseudo-symmetric crystal of [Mn(C10H24N4)(NCO)](2)](+)center dot ClO4-

机译:[Mn(C10H24N4)(NCO)](2)](+)中心点ClO4-的孪生拟对称晶体的结构细化

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摘要

The crystal studied is a 0.545 (1): 0.455 twin, space group C (1) over bar Z = 16, and is a commensurate occupational and displacive modulation of a Z = 4 idealized parent structure with the space group A2/a and a(p) = a/2, b(p) = b/2, c(p) = c. A hierarchical approach to solution and refinement led sequentially to structures in the space groups A2/a, P2(1), P (1) over bar and finally C (1) over bar. The major and minor components of the reflection intensities could be identified using irreducible representations of A2/a and P2(1), which in turn suggested suitable constraints and restraints for optimizing the refinement pathway. Comparative refinement was used to show the correctness of the final structure solution and how appropriately chosen constrained refinement allowed an escape from a false minima.
机译:研究的晶体为0.545(1):0.455孪晶,在Z = 16上的空间群C(1),并且是Z = 4理想母体结构(空间群A2 / a和a)的相应职业和位移调制。 (p)= a / 2,b(p)= b / 2,c(p)= c。解决和细化的分层方法顺序导致空间组A2 / a,P2(1)/ n,P(1)在条形之上,最后是C(1)在结构上。可以使用A2 / a和P2(1)/ n的不可约表示来确定反射强度的主要和次要成分,这反过来又提出了优化优化路径的适当约束和约束。比较细化用于显示最终结构方案的正确性,以及如何适当选择约束细化以逃避错误的最小值。

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