Synthesis and Characterization of a Metallacyclic Framework with Three Fused Five-membered Rings

Authors: 
Congqing Zhu, Jingjing Wu, Shenyan Li, Yuhui Yang, Jun Zhu, Xin Lu and Haiping Xia*
Journal: 
Angew. Chem. Int. Ed.
Year: 
2017
Volume: 
56
FirstPage-LastPage: 
9067–9071
TOC: 
Abstract: 

Polycyclic complexes containing a bridgehead transition metal are interesting species because the transition metal is shared by all the rings simultaneously. In this study, we present a novel osmium–bridgehead system with three fused five-membered rings. This novel framework can be viewed as a 10-atom carbon chain coordinating to the osmium center. In sharp contrast to the nonplanar organic analogue, this unique metallacycle exhibits good planarity, which was unambiguously verified by means of X-ray diffraction. Interestingly, preliminary DFT calculations show that the aromaticity in the three 5MRs of these osmatricycles can be easily tuned by the ligand substitution. Finally, the broad UV/Vis absorption spectra of these novel polycyclic complexes were also reported.

http://onlinelibrary.wiley.com/wol1/doi/10.1002/anie.201704057/abstract

Doi: 
10.1002/anie.201704057