title: Bond length and bond order in one of the shortest Cr-Cr bonds.
abstract: Multiconfigurational quantum chemical calculations on the R-diimines dichromium compound confirm that the Cr-Cr bond, 1.80 A, is among the shortest Cr(I)-Cr(I) bonds. However, the bond between the two Cr atoms is only a quadruple bond rather than a quintuple bond. The reason why the bond is so short has to be attributed to the strain in the NCCN ligand moieties.
authors.affiliation: Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland.
authors.forename: Giovanni
authors.initials: G
authors.lastname: La Macchia
authors.forename: Francesco
authors.initials: F
authors.lastname: Aquilante
authors.forename: Valera
authors.initials: V
authors.lastname: Veryazov
authors.forename: Björn O
authors.initials: BO
authors.lastname: Roos
authors.forename: Laura
authors.initials: L
authors.lastname: Gagliardi