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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Polysulfonylamines. CLXII. Crystal structures of metal di(methanesulfonyl)amides. II. The three-dimensional coordination polymer K[(CH3SO2)(2)N] II: A chiral structure with four independent formula units, pseudo-centrosymmetry of the crystal packing,
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Polysulfonylamines. CLXII. Crystal structures of metal di(methanesulfonyl)amides. II. The three-dimensional coordination polymer K[(CH3SO2)(2)N] II: A chiral structure with four independent formula units, pseudo-centrosymmetry of the crystal packing,

机译：聚磺胺。 CLXII。金属二（甲磺酰基）酰胺的晶体结构。二。三维配位聚合物K [（CH3SO2）（2）N] II：具有四个独立式单元的手性结构，晶体堆积的拟中心对称，

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For potassium dimesylamide, K[(CH3SO2)(2)N] or KA, two monoclinic polymorphs have been isolated from different media at ambient temperature and characterized by single crystal Xray diffraction at -100 degreesC. In the previously reported centrosymmetric structure of KA I (P2(1)/c, Z' = 1), the anion adopts an extremely rare conformation in point group C-1, whereas the chiral structure of KA II(P2(1), Z' = 4) displays three independent anions of normal C-2 symmetry and one anion substantially distorted to C-1. In addition, the independent ions of KA II are pair-wise related by a pseudo-inversion centre conferring pseudo-P2(1)/c symmetry and Z' = 2 upon the packing. Both dimorphs form three-dimensional coordination polymers, in which the oxygen and nitrogen atoms of the anions are exhaustively involved in kappa(1)- or mu(2)-type bonding to either five or six cations, whereby each of the five independent anions develops a different connectivity pattern. The coordination polyhedra of the cations comprise in KA I an O6N environment approximating to a distorted octahedron with twofold occupancy of one coordination site, in KA II two O-7 spheres forming distorted monocapped octahedra and two O4N2 spheres of trigonal-prismatic geometry. In conclusion, the Z' = 4 structure of KA II exhibits both conformational and coordination isomorphism, whereas the KA I/KA II pair represents a case of simultaneous conformational and coordination dimorphism. Weak C-(HO)-O-... hydrogen bonds are observed in both structures. [References: 15]
机译：对于二甲基酰胺基钾，K [（CH3SO2）（2）N]或KA，已在环境温度下从不同介质中分离出两个单斜晶型，并通过在-100℃下进行单晶X射线衍射表征。在先前报道的KA I的中心对称结构中（P2（1）/ c，Z'= 1），阴离子在C-1点组中具有极为罕见的构象，而KA II（P2（1））的手性结构Z'= 4）显示三个独立的，具有正常C-2对称性的阴离子和一个基本上扭曲为C-1的阴离子。另外，KA II的独立离子通过伪反转中心成对关联，伪反转中心赋予伪P2（1）/ c对称性，并且在堆积时Z'= 2。两种双晶型物均形成三维配位聚合物，其中阴离子的氧和氮原子完全参与与五个或六个阳离子形成的kappa（1）或mu（2）型键合，从而五个独立的阴离子中的每个开发不同的连接模式。阳离子的配位多面体在KA I中包含一个近似扭曲的八面体的O6N环境，其中一个配位点具有两倍的占有率;在KA II中，两个O-7球形成了畸变的单封八面体和两个三棱柱几何形状的O4N2球体。总之，KA II的Z'= 4结构同时显示构象和配位同构，而KA I / KA II对代表同时发生构象和配位二同构的情况。在两个结构中均观察到弱的C-（HO）-O -...氢键。 [参考：15]

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