title: Donor-Stabilized 1,3-Disila-2,4-diazacyclobutadiene with a Nonbonded Si⋅⋅⋅Si Distance Compressed to a Si=Si Double Bond Length.
abstract: A donor-stabilized 1,3-disila-2,4-diazacyclobutadiene presents an exceptionally short nonbonded Si⋅⋅⋅Si distance (2.23 Å), which is as short as that of Si=Si bonds (2.15-2.23 Å). Theoretical investigations indicate that there is no bond between the two silicon atoms, and that the unusual geometry can be related to a significant coulomb repulsion between the two ring nitrogen atoms. This chemical pressure phenomenon could provide an alternative and superior way of squeezing out van der Waals space in highly strained structures, as compared to the classical physical methods.
authors.affiliation: Université de Toulouse, UPS, and CNRS, LHFA UMR 5069, 118 route de Narbonne, 31062, Toulouse cedex 9, France.
authors.forename: David
authors.initials: D
authors.lastname: Gau
authors.affiliation: Université de Toulouse, UPS, and CNRS, LHFA UMR 5069, 118 route de Narbonne, 31062, Toulouse cedex 9, France.
authors.forename: Raphael
authors.initials: R
authors.lastname: Nougué
authors.affiliation: Université de Toulouse, UPS, ICT-FR2599, 118 route de Narbonne, 31062, Toulouse cedex 9, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Saffon-Merceron
authors.affiliation: Université de Toulouse, UPS, and CNRS, LHFA UMR 5069, 118 route de Narbonne, 31062, Toulouse cedex 9, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Baceiredo
authors.affiliation: Universidad del País Vasco, Euskal Herriko Unibertsitatea Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA), 1072, San Sebastián-Donostia, Spain.|Donostia International Physics Center (DIPC), 20018, San Sebastián-Donostia, Spain.|IKERBASQUE, Basque Foundation for Science, 48013, Bilbao, Spain.
authors.forename: Abel
authors.initials: A
authors.lastname: De Cózar
authors.affiliation: Universidad del País Vasco, Euskal Herriko Unibertsitatea Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA), 1072, San Sebastián-Donostia, Spain.|Donostia International Physics Center (DIPC), 20018, San Sebastián-Donostia, Spain.
authors.forename: Fernando P
authors.initials: FP
authors.lastname: Cossío
authors.affiliation: Materials Characterization Support Unit, RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.affiliation: Université de Toulouse, UPS, and CNRS, LHFA UMR 5069, 118 route de Narbonne, 31062, Toulouse cedex 9, France.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kato
keywords: density functional calculations; reactive intermediates; silicon; small ring systems; structure elucidation