Eder Felix, Weil Matthias
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/E164-05-1, A-1060 Vienna, Austria.
Acta Crystallogr E Crystallogr Commun. 2023 Jul 14;79(Pt 8):718-721. doi: 10.1107/S2056989023006072. eCollection 2023 Jul 1.
The crystal structure of K[Zn(CO)], hexa-potassium tetra-carbonato-zincate(II), comprises four unique potassium cations (two located on a general position, and two on the twofold rotation axis of the space group 2/) and a [Zn(CO)] anion. The Zn atom of the latter is located on the twofold rotation axis and is surrounded in a slightly distorted tetra-hedral manner by two pairs of monodentately binding carbonate groups, with Zn-O distances of 1.9554 (18) and 1.9839 (18) Å. Both carbonate groups exhibit a slight deviation from planarity, with the C atom being shifted by 0.008 (2) and 0.006 (3) Å, respectively, from the plane of the three O atoms. The coordination numbers of the potassium cations range from 6 to 8, using a threshold of 3.0 Å for K-O bonding inter-actions being significant. In the crystal structure, [KO] polyhedra and [Zn(CO)] groups share O atoms to build up the framework structure.
六碳酸四锌酸钾（II）K[Zn(CO)]的晶体结构包含四个独特的钾阳离子（两个位于一般位置，两个位于空间群2/的二重旋转轴上）和一个[Zn(CO)]阴离子。后者的锌原子位于二重旋转轴上，被两对单齿配位的碳酸根以略微扭曲的四面体方式包围，锌-氧距离为1.9554 (18) 和1.9839 (18) Å。两个碳酸根均略微偏离平面，碳原子分别相对于三个氧原子所在平面偏移了0.008 (2) 和0.006 (3) Å。钾阳离子的配位数在6到8之间，钾-氧键相互作用的阈值为3.0 Å，在此距离下相互作用显著。在晶体结构中，[KO]多面体和[Zn(CO)]基团共享氧原子以构建骨架结构。
