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结构精修需要删除的键案例16 案例来源：CCDC[1] 1575083–1575086,2447878. Inorg. Chem. 2018, 57, 15069–15078. DOI[2]: 10.1021/acs.inorgchem.8b02067. 案例结构如图1所示（由ChemBioDraw[3]绘制）。
▲图1 案例结构 如图2–3所示（由Olex2[4]呈现），由于配体中酰胺基团以κ2模式与金属之间的成键形成NCORE四元环使得碳与稀土金属之间的距离满足成键条件（参阅推文“Olex2中成键条件”）而存在C‒RE键，另外就是硅与稀土金属之间的距离满足成键条件从而存在Si‒RE键，实际上这些都不是“真实的”键，在精修中应当使用SHELXL[5]指令FREE（参阅推文“SHELXL指令之FREE”，操作可参阅视频“Olex2基操-删除键(SHELXL指令FREE和Olex2指令delbond)：https://www.bilibili.com/video/BV1Um421x7oR”）或CONN指令（参阅推文“SHELXL指令之CONN”，操作可参阅视频“Olex2基操-最大成键数的设置(CONN指令)：https://www.bilibili.com/video/BV1xW4y1h7X1”）将其从连通性列表中删去（参阅推文“晶体数据审稿意见-报道真实键”）。
▲图2 CCDC 1575083结构中应当删除的键
▲图3 CCDC 2447878结构中应当删除的键 相关视频： 单晶结构解析练习574(文献案例-无序处理)：https://www.bilibili.com/video/BV12pGfzREyq 单晶结构解析练习575(无序处理)：https://www.bilibili.com/video/BV1uLGfzhEzB 结构精修需要删除的键案例16：https://www.bilibili.com/video/BV1cYV9zqEXV 参考文献 [1] (a) Allen, F. H.The Cambridge Structural Database: A Quarter of a Million Crystal Structuresand Rising. Acta Cryst. 2002, B58, 380–388. DOI:10.1107/S0108768102003890. (b) Groom, C. R.; Bruno, I. J.; Lightfoot, M.P.; Ward, S. C. The Cambridge Structural Database. Acta Cryst. 2016, B72, 171–179. DOI:10.1107/S2052520616003954. (c) Mitchell, J.; Robertson, J. H.; Raithby,P. R. Cambridge Crystallographic Data Centre (CCDC). Comprehensive Coordination Chemistry III 2021, 413–437. DOI:10.1016/B978-0-12-409547-2.14829-2. [2] (a) InternationalOrganization for Standardization (2012). ISO 26324:2012. Information and Documentation – Digital Object Identifier System. http://www.iso.org/iso/catalogue_detail.htm?csnumber=43506. (b) McDonald J. D.;Levine-Clark, M. Encyclopedia of Libraryand Information Sciences. Fourth Edition, CRC Press, 2017. DOI: 10.1081/e-elis4. (c) Liu, J. Digital ObjectIdentifier (DOI) and DOI Services: An Overview. Libri 2021, 71, 349‒360. DOI:10.1515/libri-2020-0018. (d) International Organization for Standardization(2022). ISO 26324:2022. Information andDocumentation – Digital Object Identifier System. https://www.iso.org/standard/81599.html[3] (a) Klein, F. M.CS ChemDraw Pro,1 Version 3.1 for Windows. J. Chem. Inf. Comput. Sci. 1995, 35, 166–167. DOI: 10.1021/ci00023a026. (b)Cousins, K. R. ChemDraw 6.0 Ultra CambridgeSoft Corporation, 100 Cambridge ParkDrive, Cambridge, MA 02140. http://www.camsoft.com. Commercial Price: $1395.Academic Price: $699. J. Am. Chem. Soc. 2000, 122, 10257–10258. DOI: 10.1021/ja0047572.(c) Buntrock, R. E. ChemOffice Ultra 7.0. J. Chem. Inf. Comput. Sci. 2002, 42, 1505–1506. DOI: 10.1021/ci025575p. (d) Li, Z.; Wan, H.; Shi, Y.;Ouyang, P. Personal Experience with Four Kinds of Chemical Structure DrawingSoftware: Review on ChemDraw, ChemWindow, ISIS/Draw, and ChemSketch. J. Chem. Inf. Comput. Sci. 2004, 44, 1886–1890. DOI: 10.1021/ci049794h.(e) Mendelsohn, L. D. ChemDraw8 Ultra, Windows and Macintosh Versions. J. Chem. Inf. Comput. Sci. 2004, 44, 2225–2226. DOI: 10.1021/ci040123t. (f) Cousins, K. R. ChemDrawUltra 9.0. CambridgeSoft, 100 CambridgePark Drive, Cambridge, MA 02140. www.cambridgesoft.com. See Web site for pricing options. J. Am. Chem. Soc. 2005, 127, 4115–4116. DOI:10.1021/ja0410237. (g) Zielesny, A. Chemistry Software PackageChemOffice Ultra 2005. J. Chem. Inf.Model. 2005, 45, 1474–1477. DOI:10.1021/ci050273j. (h) Mills, N. ChemDraw Ultra 10.0 CambridgeSoft, 100CambridgePark Drive, Cambridge, MA 02140. www.cambridgesoft.com. CommercialPrice: $1910 for download, $2150 for CD-ROM; Academic Price: $710 fordownload, $800 for CD-ROM. J. Am. Chem. Soc. 2006, 128, 13649–13650. DOI: 10.1021/ja0697875. (i) Kerwin, S. M.ChemBioOffice Ultra 2010 Suite. J. Am. Chem. Soc. 2010, 132, 2466–2467. DOI: 10.1021/ja1005306. (j) Milne, G. W. A. SoftwareReview of ChemBioDraw 12.0. J. Chem. Inf.Model. 2010, 50, 2053. DOI:10.1021/ci100385n. (k) Narayanaswamy, V. K.; Rissdörfer, M.; Odhav, B.Review on CambridgeSoft ChemBioDraw Ultra 13.0v. Int. J. Theor. Appl. Sci. 2013, 5, 43–49. [4] 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. DOI: 10.1107/S0021889808042726. [5] (a) Sheldrick, G. M. SHELXL-2019/3, Program for Crystal Structure Refinement, University of Göttingen,Germany, 2019. (b)Sheldrick, G. M. A Short History of SHELX.Acta Cryst. 2008, A64, 112–122. DOI: 10.1107/S0108767307043930. (c) Sheldrick, G. M. CrystalStructure Refinement with SHELXL. Acta Cryst. 2015, C71, 3–8. DOI:10.1107/S2053229614024218. (d) Lübben, J.; Wandtke, C. M.; Hübschle, C. B.; Ruf, M.;Sheldrick, G. M.; Dittrich, B. Aspherical Scattering Factors for SHELXL – Model, Implementation andApplication. Acta Cryst. 2019, A75, 50–62. DOI:10.1107/S2053273318013840. 声明：本文仅代表个人观点，笔者学识有限，资料整理过程中可能存在疏漏错误，请不吝指正。
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发表于 2025-5-10 07:06:20
