Materials Data on RbC2 by Materials Project

RbC2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Rb1+ is bonded in a distorted q4 geometry to ten C+0.50- atoms. There are a spread of Rb–C bond distances ranging from 3.06–3.51 Å. There are two inequivalent C+0.50- sites. In the first C+0.50- site, C+0.50- is bonded in a 2-coordinate geometry to five equivalent Rb1+ and one C+0.50- atom. The C–C bond length is 1.26 Å. In the second C+0.50- site, C+0.50- is bonded to five equivalent Rb1+ and one C+0.50- atom to form a mixture of distorted edge and corner-sharing CRb5C octahedra. The corner-sharing octahedral tilt angles are 20°.

RbC₂晶体结晶于四方晶系P4/nmm空间群（space group），其结构为三维框架结构。Rb1+以畸变的q4几何构型与10个C+0.50-原子成键，Rb-C键长分布于3.06~3.51埃（Å）区间。该体系存在两个不等价的C+0.50-位点：在第一个C+0.50-位点中，C+0.50-以双配位几何构型与5个等价的Rb1+及1个C+0.50-原子成键，C-C键长为1.26埃；在第二个C+0.50-位点中，C+0.50-与5个等价的Rb1+及1个C+0.50-原子成键，形成兼具畸变棱共享与角共享特征的CRb5C八面体（octahedra）结构单元，其中角共享八面体的倾斜角为20°。