论文题目：A sandwich-type cluster containing Ge@Pd3 planar fragment flanked by aromatic nonagermanide caps

论文作者：Honglei Xu, Nikolay V. Tkachenko, Zichuan Wang, Weixing Chen, Lei Qiao, Alvaro Muñoz-Castro, Alexander I.Boldyrev, Zhongming Sun*

发表期刊：Nature Communications, 11(1), 5286, 2020    

Abstract： 

Sandwich-type clusters with the planar fragment containing a  heterometallic sheet have remained elusive. In this work, we introduce  the [K(2,2,2-crypt)](4){(Ge-9)(2)[eta (6)-Ge(PdPPh3)(3)]} complex that  contains a heterometallic sandwich fragment. The title compound is  structurally characterized by means of single-crystal X-ray diffraction,  which reveals the presence of an unusual heteroatomic metal planar  fragment Ge@Pd-3. The planar fragment contains a rare formal zerovalent  germanium core and a peculiar bonding mode of sp(2)-Ge@(PdPPh3)(3)  trigonal planar structure, whereas the nonagermanide fragments act as  capping ligands. The chemical bonding pattern of the planar fragment  consists of three 2c-2e Pd-Ge sigma -bonds attaching Pd atoms to the  core Ge atom, while the binding between the planar fragment and the  aromatic Ge-9 ligands is provided by six 2c-2e Pd-Ge sigma -bonds and  two delocalized 4c-2e sigma -bonds. The synthesized cluster represents a  rare example of a sandwich compound with the heteroatomic metal planar  fragment and inorganic aromatic capping ligands. Sandwich-type clusters  containing heterometallic interlayers have remained elusive. Here, the  authors present the structure of a cluster composed of two aromatic  nonagermanide caps flanking an heterometallic Ge@Pd-3 planar fragment,  where the Ge center is formally zerovalent.