首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >First experimental charge density study using a Bruker CMOS-type PHOTON 100 detector: the case of ammonium tetraoxalate dihydrate. Addendum
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First experimental charge density study using a Bruker CMOS-type PHOTON 100 detector: the case of ammonium tetraoxalate dihydrate. Addendum

机译:使用Bruker CMOS型PHOTON 100检测器进行的首次实验电荷密度研究:四水合四草酸铵的情况。附录

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摘要

Very recently we published a paper describing the first use of a Bruker AXS CMOS-type PHOTON 100 detector in experimental electron density studies (Jarzembska et al., 2014). A crystal of ammonium tetraoxalate dihydrate had been chosen as a test case due to its structural complexity, low symmetry and presence of anharmonic motion. Unfortunately, it transpires that we have overlooked a very important reference, namely the article published by Stash et al. (2013). The corresponding CIF was not present in the standalone version of the Cambridge Structural Database (Allen, 2002) available at the time we published our contribution. The paper by Stash et al. (2013) deals with the charge density distribution of the same compound, but measured at the 15-ID ChemMatCARS beamline of the Advanced Photon Source synchrotron (Chen et al., 2014). Consequently, in this short addendum we would like to supplement our previous work by comparing the two charge density distributions. Such a comparison is especially valuable since the data had been measured using a well established methodology applying a Bruker AXS CCD-type APEX II detector at a synchrotron beamline known for accurate and precise electron density studies. Selected parameters of the two data collections are summarized in Table 1.
机译:最近,我们发表了一篇论文,描述了在实验电子密度研究中首次使用Bruker AXS CMOS型PHOTON 100检测器(Jarzembska等人,2014)。由于其结构复杂,对称性低和存在非谐运动,因此选择了四水合四草酸铵的晶体作为测试案例。不幸的是,事实证明我们忽略了一个非常重要的参考文献,即Stash等人发表的文章。 (2013)。在我们发表文稿时,独立的剑桥结构数据库版本(Allen,2002)中没有相应的CIF。 Stash等人的论文。 (2013年)处理相同化合物的电荷密度分布,但是在先进光子源同步加速器的15-ID ChemMatCARS束线处测量的(Chen等人,2014年)。因此,在这个简短的附录中,我们想通过比较两个电荷密度分布来补充我们以前的工作。这样的比较特别有价值,因为数据是使用公认的方法,在众所周知的精确和精确的电子密度研究中,在同步加速器光束线上使用布鲁克AXS CCD型APEX II检测器测量的。表1汇总了这两个数据收集的选定参数。

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