title: Low-valent vanadium complexes of a pyrrolide-based ligand. Electronic structure of a dimeric V(I) complex with a short and weak metal-metal bond.
abstract: Deprotonation of the nitrogen atoms of the two pyrrole rings of 1,3-bis-{[(1'-pyrrol-2-yl)-1,1'-dimethyl]methyl}benzene with KH followed by further reaction with either VCl 3(THF) 3 or with VCl 2(TMEDA) 2 respectively gave the paramagnetic complexes [1,3-bis-{[(1'-pyrrol-2-yl)-1,1'-dimethyl]methyl}benzene]VCl(DME) ( 1) and [1,3-bis-{[(1'-pyrrol-2-yl)-1,1'-dimethyl]methyl}benzene]V(THF) 3 ( 2). Further reduction with the appropriate amount of KH afforded diamagnetic dinuclear [1,3-bis-{[(1'-pyrrol-2-yl)-1,1'-dimethyl]methyl}benzene]V} 2] ( 3). In complex 3, the bridging interaction between the two metal centers is realized via the ligand central benzene ring. Density functional theory calculations have elucidated the nature of the electronic interaction between the two metals with the bridging pi-system thus accounting for its visible structural distortion. Calculations also pointed out the presence of only a weak V-V bond in spite of the short V-V distance.
authors.affiliation: Department of Chemistry and Laboratory of Computational Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Sougandi
authors.initials: S
authors.lastname: Ilango
authors.forename: Balamurugan
authors.initials: B
authors.lastname: Vidjayacoumar
authors.forename: Sandro
authors.initials: S
authors.lastname: Gambarotta
authors.forename: Serge I
authors.initials: SI
authors.lastname: Gorelsky