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CIF必填项-结构解析方法(PLAT883) CIF[1]文件中记录结构解析方法(用于定位初始原子位点的方法的代码)的条目为“_atom_sites_solution_primary”(参阅推文“CIF核心词典-ATOM_SITES”),记录解析方法对应解析程序及其参考文献的条目为“_computing_structure_solution”(参阅推文“CIF核心词典-COMPUTING”),此外还有记录,记录除了初始原子之外非氢原子位点方法的代码的条目“_atom_sites_solution_secondary”以及氢原子位点确定方法的代码的条目“_atom_sites_solution_hydrogens”,这三个条目基本含义如下。 | _atom_sites_solution_primary | (char) | | | Codes which identify the methods used to locate the initial atom sites. The *_primary code identifies how the first atom sites were determined; the *_secondary code identifies how the remaining non-hydrogen sites were located; and the *_hydrogens code identifies how the hydrogen sites were located. | 识别用于定位初始原子位点的方法的代码。*_primary标识第一个原子位点是如何确定的;*_secondary代码标识剩余的非氢位点是如何定位的;以及*_hydrogens代码标识氢位点是如何定位的。 | | Reference: Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | 参考文献:Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | | difmap | difference Fourier map | 差值傅里叶图 | | vecmap | real-space vector search | 实空间矢量搜索 | | heavy | heavy-atom method | 重原子法 | | direct | structure-invariant direct methods | 结构不变直接法 | | geom | inferred from neighbouring sites | 由相邻位点推断 | | disper | anomalous-dispersion techniques | 反常散射技术 | | isomor | isomorphous structure methods | 同构结构法 | | notdet | coordinates were not determined | 坐标未确定 | | dual | dual-space method (Sheldrick et al., 2001) | 双空间法(Sheldrick et al., 2001) | | iterative | iterative algorithm, e.g. charge flipping [Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | 迭代算法,例如电荷翻转[Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | | other | a method not included elsewhere in this list | 此列表中其他位置未包含的方法 | | [atom_sites] | [atom_sites] | | | | | |
| _atom_sites_solution_secondary | (char) | | | Codes which identify the methods used to locate the initial atom sites. The *_primary code identifies how the first atom sites were determined; the *_secondary code identifies how the remaining non-hydrogen sites were located; and the *_hydrogens code identifies how the hydrogen sites were located. | 识别用于定位初始原子位点的方法的代码。*_primary标识第一个原子位点是如何确定的;*_secondary代码标识剩余的非氢位点是如何定位的;以及*_hydrogens代码标识氢位点是如何定位的。 | | Reference: Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | 参考文献:Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | | difmap | difference Fourier map | 差值傅里叶图 | | vecmap | real-space vector search | 实空间矢量搜索 | | heavy | heavy-atom method | 重原子法 | | direct | structure-invariant direct methods | 结构不变直接法 | | geom | inferred from neighbouring sites | 由相邻位点推断 | | disper | anomalous-dispersion techniques | 反常散射技术 | | isomor | isomorphous structure methods | 同构结构法 | | notdet | coordinates were not determined | 坐标未确定 | | dual | dual-space method (Sheldrick et al., 2001) | 双空间法(Sheldrick et al., 2001) | | iterative | iterative algorithm, e.g. charge flipping [Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | 迭代算法,例如电荷翻转[Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | | other | a method not included elsewhere in this list | 此列表中其他位置未包含的方法 | | [atom_sites] | [atom_sites] | | | | | |
| _atom_sites_solution_hydrogens | (char) | | | Codes which identify the methods used to locate the initial atom sites. The *_primary code identifies how the first atom sites were determined; the *_secondary code identifies how the remaining non-hydrogen sites were located; and the *_hydrogens code identifies how the hydrogen sites were located. | 识别用于定位初始原子位点的方法的代码。*_primary标识第一个原子位点是如何确定的;*_secondary代码标识剩余的非氢位点是如何定位的;以及*_hydrogens代码标识氢位点是如何定位的。 | | Reference: Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | 参考文献:Sheldrick, G. M., Hauptman, H. A., Weeks, C. M., Miller, R. and Usón, I. (2001). Ab initio phasing. In International Tables for Crystallography, Vol. F. Crystallography of biological macromolecules, edited by M. G. Rossmann and E. Arnold, ch.16.1. Dordrecht: Kluwer Academic Publishers. | | difmap | difference Fourier map | 差值傅里叶图 | | vecmap | real-space vector search | 实空间矢量搜索 | | heavy | heavy-atom method | 重原子法 | | direct | structure-invariant direct methods | 结构不变直接法 | | geom | inferred from neighbouring sites | 由相邻位点推断 | | disper | anomalous-dispersion techniques | 反常散射技术 | | isomor | isomorphous structure methods | 同构结构法 | | notdet | coordinates were not determined | 坐标未确定 | | dual | dual-space method (Sheldrick et al., 2001) | 双空间法(Sheldrick et al., 2001) | | iterative | iterative algorithm, e.g. charge flipping [Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | 迭代算法,例如电荷翻转[Oszlányi, G. and Süto, A. (2004). Acta Cryst. A60, 134-141] | | other | a method not included elsewhere in this list | 此列表中其他位置未包含的方法 | | [atom_sites] | [atom_sites] | | | | | |
对于这三个条目,如果“_atom_sites_solution_primary”条目信息缺失(即,该条目值为“?”),如图1所示。
▲图1 “_atom_sites_solution_primary”条目信息缺失
▲图2 G级警报PLAT883 而将“_atom_sites_solution_primary”条目信息补上后,例如SHELXT[2]结构解析方法代码“dual”,如图3所示,则不会存在G级警报PLAT883,如图4所示。
▲图3 “_atom_sites_solution_primary”条目信息
▲图4 “_atom_sites_solution_primary”条目信息完整的验证报告 从完善CIF文件的信息科学角度考虑,这三个条目的信息均应正确填写。 不过这些条目的信息即便缺失,也仅仅是触发最低等级的警报,如果是不甚在意的审稿人,倒也没啥大问题,但遇到较真的审稿人,则回触发如下审稿意见(参阅推文“审稿意见-原子位置解析方法填写”): A couple of fields seem blank afterre-refinements: "_atom_sites_solution_hydrogens","_atom_sites_solution_primary ?","_atom_sites_solution_secondary ?", please add for completeness. 氢原子确定方法条目“_atom_sites_solution_hydrogens”信息通常不会缺失,SHELXL[3]程序会自动填写。 如果从最初解析到最后生成CIF文件都在一个文件夹中进行,记录解析方法对应解析程序及其参考文献条目“_computing_structure_solution”信息和记录结构解析方法的条目“_atom_sites_solution_primary”信息SHELXL也能自动填写。但如果中途更换文件夹,例如将res或ins和hkl文件单独放到一个新的文件夹中进行处理,最终在这个新的文件夹中生成CIF文件,则这两个条目的信息可能会缺失,那就需要手动填写。 而“_atom_sites_solution_secondary”条目信息则需要手动填写。 因此,在生成最终CIF文件后,必须打开CIF文件检查这三个条目信息是否缺失,并将其补全。 视频讲解请参阅: CIF必填项-结构解析方法(PLAT883):https://www.bilibili.com/video/BV1jSEVzwERu 参考文献 [1] (a) Hall, S. R.;Allen, F. H. Brown, I. D. The Crystallographic Information File (CIF): A NewStandard Archive File for Crystallography. ActaCryst. 1991, A47, 655–685. DOI:10.1107/S010876739101067X. (b) Hall, S. R. The STAR File: A New Formatfor Electronic Data Transfer and Archiving. J.Chem. Inf. Comput. Sci. 1991, 31, 326–333. DOI:10.1021/ci00002a020. (c) Hall, S. R.; Spadaccini, N. The STAR File:Detailed Specifications. J. Chem. Inf.Comput. Sci. 1994, 34, 505–508. DOI:10.1021/ci00019a005. [2] (a) Sheldrick, G.M. SHELXS-97, Program for Crystal Structure Solution. University of Göttingen,Germany, 1997. (b) Sheldrick, G. M. Phase Annealing in SHELX-90: Direct Methodsfor Larger Structures. Acta Cryst. 1990, A46, 467‒473. DOI:10.1107/S0108767390000277. [3] (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. Crystal Structure 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 ScatteringFactors for SHELXL – Model,Implementation and Application. ActaCryst. 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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