title: 10-π-Electron arenes à la carte: structure and bonding of the [E-(CnHn)-E](n-6) (E = Ca, Sr, Ba; n = 6-8) complexes.
abstract: In this paper, we provide solid evidence to show that among an overwhelming structural diversity, alkaline earth metals (Ca, Sr, Ba) have the ability to form inverted sandwich compounds with C6H6, C7H7(+), and C8H8(2+) of Dnh symmetry and general formula [E-(CnHn)-E](n-6) (n = 6-8) with planar 10-π-electron aromatic cores by virtue of transferring two electrons per metal atom to the ring. However, the origin of the orbital interaction between the metals and the carbon ring is quite different; while [E-(C6H6)-E] complexes are dominated by δ-interactions, both π- and δ-interactions are important in [E-(C7H7)-E](+) and [E-(C8H8)-E](2+) complexes.
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., Mexico. gmerino@mda.cinvestav.mx.
authors.forename: Sukanta
authors.initials: S
authors.lastname: Mondal
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., Mexico. gmerino@mda.cinvestav.mx.
authors.forename: Jose Luis
authors.initials: JL
authors.lastname: Cabellos
authors.affiliation: Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur, 721302, India.
authors.forename: Sudip
authors.initials: S
authors.lastname: Pan
authors.affiliation: Departamento de Ciencias Básicas, Fundación Universitaria Luis Amigó, SISCO, Transversal 51A #67B 90, Medellín, Colombia.
authors.forename: Edison
authors.initials: E
authors.lastname: Osorio
authors.affiliation: Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, P.O. Box: 14-0149, Lima, Peru.
authors.forename: Juan Jose
authors.initials: JJ
authors.lastname: Torres-Vega
authors.affiliation: Departamento de Ciencias Químicas, Facultad de Ciencias Exactas Universidad Andres Bello, República 275, Santiago, Chile.
authors.forename: William
authors.initials: W
authors.lastname: Tiznado
authors.affiliation: Instituto de Química, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
authors.forename: Albeiro
authors.initials: A
authors.lastname: Restrepo
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., Mexico. gmerino@mda.cinvestav.mx.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Merino