title: B18(2-): a quasi-planar bowl member of the Wankel motor family.
abstract: A quasi-planar member of the so-called 'Wankel motor' family, B18(2-), is found. This boron cluster is an electronically stable dianion and a concentric doubly σ- and π-aromatic system. The inner B6 unit in B18(2-) undergoes quasi-free rotation inside the perimeter of the B12 ring. The absence of any localized σ-bond between the inner ring and the peripheral boron atoms makes the system fluxional.
authors.affiliation: Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida, km 6 Antigua carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., México. gmerino@mda.cinvestav.mx.
authors.forename: Diego
authors.initials: D
authors.lastname: Moreno
authors.forename: Sudip
authors.initials: S
authors.lastname: Pan
authors.forename: Lei Liu
authors.initials: LL
authors.lastname: Zeonjuk
authors.forename: Rafael
authors.initials: R
authors.lastname: Islas
authors.forename: Edison
authors.initials: E
authors.lastname: Osorio
authors.forename: Gerardo
authors.initials: G
authors.lastname: Martínez-Guajardo
authors.forename: Pratim K
authors.initials: PK
authors.lastname: Chattaraj
authors.forename: Thomas
authors.initials: T
authors.lastname: Heine
authors.forename: Gabriel
authors.initials: G
authors.lastname: Merino