Lindquist-Kleissler Brent, Villanueva Viky, Getahun Addis, Johnstone Timothy C
Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States.
Cryst Growth Des. 2024 Nov 25;24(24):10247-10255. doi: 10.1021/acs.cgd.4c01240. eCollection 2024 Dec 18.
Organometallic antimony(V) complexes were prepared as model compounds to better understand the interactions of chiral chelating diols with this metalloid. These complexes feature three aryl groups (-xylyl or -tolyl) and a bidentate -2,3-butanediolate. The -xylyl and -tolyl complexes of either enantiomerically pure 2,3-butanediolate or 2,3-butanediolate (compounds -) crystallized in Sohncke space groups, as expected. In each case, though, pseudoinversion centers were present that mimic higher-symmetry space groups through global pseudosymmetry. We hypothesized that the crystallization of 1:1 mixtures of the enantiomeric complexes would produce crystals in the centrosymmetric space group approximated by the pseudosymmetry. The enantiomerically pure -xylyl complexes each crystallized in space group 1 (approximating 1̅), and the racemic compound did indeed crystallize in 1̅. The enantiomerically pure -tolyl complexes each crystallized in space group 2 (approximating 2/), but the racemic compound crystallized in 1̅. Although the enantiomerically pure and racemic compounds are not isostructural, there are similarities in their 3D structures that are analyzed.
制备有机金属锑（V）配合物作为模型化合物，以便更好地理解手性螯合二醇与这种准金属的相互作用。这些配合物具有三个芳基（-二甲苯基或-甲苯基）和一个双齿-2,3-丁二醇酯。预期对映体纯的2,3-丁二醇酯或2,3-丁二醇酯（化合物-）的-二甲苯基和-甲苯基配合物会在 Sohncke 空间群中结晶。然而，在每种情况下，都存在伪反演中心，通过整体伪对称性模拟更高对称性的空间群。我们假设对映体配合物的 1:1 混合物结晶会产生由伪对称性近似的中心对称空间群中的晶体。对映体纯的-二甲苯基配合物各自在空间群 1（近似1̅）中结晶，外消旋化合物确实在1̅中结晶。对映体纯的-甲苯基配合物各自在空间群 2（近似2/）中结晶，但外消旋化合物在1̅中结晶。尽管对映体纯和外消旋化合物不是同构的，但它们的三维结构存在相似性并进行了分析。
