As aromaticity is one of the most fundamental concepts in chemistry, the construction of aromatic systems has long been an important subject.
Recently, Prof. YE Shengfa from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, in collaboration with Prof. XI Zhenfeng from Peking University, synthesized and characterized a tris-spiroaromatic complex, hexalithio spiro vanadacycle.
Their study was published in nature communications on Feb 26.
Structure and EPR/MOs/AICD of complex (Image by JIANG Yang)
The scientists analyzed the electronic structure using electron paramagnetic resonance coupled with density functional calculations.
It was found that complex represented an unprecedented 40π Craig-Mobius aromatic system that was realized by electron delocalization of four electrons within the two V 3d orbitals and thirty-six electrons arising from the π* orbitals of the three biphenyl ligands.
This work presents a type of aromatic systems that may contribute to both aromaticity theory and organometallic chemistry. (Text by JIANG Yang)