相关软件或概念:Olex2[1] (Version: Olex2-1.5); SHELXL[2] (Version: SHELXL-2019/3); PLATON[3] (Version: 60124); SHELXT[4] 案例来源:CCDC2341604, DOI: 10.5517/ccdc.csd.cc2jlmmd. 该结构中氰基椭球形变较为严重,如图1所示。 ▲图1 椭球形变的氰基 已知原料中该位置为溴,因此考虑可能反应不完全,对其做溴和氰基的混合占位无序,结果如图2所示,R因子得到极大改善。 ▲图2 溴和氰基混占无序处理结果 视频操作演示参阅: 单晶结构解析练习139(数据还原-氰基和溴的共占据无序):https://www.bilibili.com/video/BV1mm411k7vW 需要数据练习,请在以下链接下载。 (1) 链接:https://pan.quark.cn/s/a41a7e0d4b92 提取码:XWCs (2) 链接:https://pan.baidu.com/s/1Ae7KwdXoQJAJj2e5_aPZ-Q 提取码:fji2 参考文献 [1]Dolomanov, O. V.; Bourhis, L. J.; Gildea, R. J.; Howard, J. A. K.; Puschmann,H. OLEX2: A complete structure solution,refinement and analysis program. J. Appl. Cryst. 2009, 42, 339–341. [2](a) Sheldrick, G. M. SHELXL-2019/3, Program for Crystal Structure Refinement,University of Göttingen, Germany, 2019. (b) Sheldrick, G. M. A short history ofSHELX. Acta Cryst. 2008, A64, 112–122. (c) Sheldrick, G. M.Crystal structure refinement with SHELXL.Acta Cryst. 2015, C71, 3–8. (d)Lübben, J.; Wandtke, C. M.; Hübschle, C. B.; Ruf, M.; Sheldrick, G. M.;Dittrich, B. Aspherical scattering factors for SHELXL – model, implementation and application. Acta Cryst. 2019, A75, 50–62. [3] (a) Spek, A. L. Single-crystal structure validationwith the program PLATON. J. Appl.Cryst. 2003, 36, 7–13. (b) Spek,A. L. Structure validation in chemical crystallography. Acta Cryst. 2009, D65, 148–155. (c) Spek, A. L. What makes a crystal structure reportvalid? Inorg. Chim. Acta 2018, 470, 232–237. (d) Spek, A. L. checkCIFvalidation ALERTS: what they mean and how to respond. Acta Cryst. 2020, E76, 1–11. [4]Sheldrick, G. M. SHELXT – Integratedspace-group and crystal structure determination. Acta Cryst. 2015, A71, 3–8.
如需PDF文档,请从以下链接下载: 通过网盘分享的文件:无序示例-溴和氰基混占无序.pdf
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