title: Planar Möbius aromatic pentalenes incorporating 16 and 18 valence electron osmiums.
abstract: Aromaticity, a highly stabilizing feature of molecules with delocalized electrons in closed circuits, is generally restricted to 'Hückel' systems with 4n+2 mobile electrons. Although the Möbius concept extends the principle of aromaticity to 4n mobile electron species, the rare known examples have complex, twisted topologies whose extension is unlikely. Here we report the realization of osmapentalenes, the first planar Möbius aromatic complexes with 16 and 18 valence electron transition metals. The Möbius aromaticity of these osmapentalenes, documented by X-ray structural, magnetic and theoretical analyses, demonstrates the basis of the aromaticity of the parent osmapentalynes. All these osmapentalenes are formed by both electrophilic and nucleophilic reactions of the in-plane π component of the same carbyne carbon, illustrating ambiphilic carbyne reactivity, which is seldom observed in transition metal chemistry. Our results widen the scope of Möbius aromaticity dramatically and open prospects for the generalization of planar Möbius aromatic chemistry.
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Congqing
authors.initials: C
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: 1] State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China [2] Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
authors.forename: Paul V R
authors.initials: PV
authors.lastname: Schleyer
authors.affiliation: Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
authors.forename: Judy I-Chia
authors.initials: JI
authors.lastname: Wu
authors.affiliation: 1] State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China [2] Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Xiamen University, Xiamen 361005, China.
authors.forename: Haiping
authors.initials: H
authors.lastname: Xia