title: Diferrocenophosphaborin: A Planar-Chiral, Redox-Active and Anion-Responsive Ambiphilic Ligand.
abstract: A new class of Janus-like ambiphilic ligands is introduced. The rigid diferrocene backbone in heterocycles 4-SnP and 4-BP creates an unprecedented chiral environment as demonstrated by multinuclear NMR and single-crystal X-ray studies. In addition, the ligands are redox-responsive and the Lewis acidic borane moiety in 4-BP can be exploited to further tune the properties: a clear decrease in the CO stretching frequency of a Vaska-type Rh(I) complex 5-BP is observed upon addition of fluoride ions. Thus, the Lewis acid and Lewis base sites influence each other and their strength can be modulated by redox chemistry and anion binding.
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102 (USA).
authors.forename: Jiawei
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102 (USA).
authors.forename: Didier A
authors.initials: DA
authors.lastname: Murillo Parra
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102 (USA).
authors.forename: Roger A
authors.initials: RA
authors.lastname: Lalancette
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102 (USA). fjaekle@rutgers.edu.
authors.forename: Frieder
authors.initials: F
authors.lastname: Jäkle
keywords: Lewis acids; ambiphilic ligands; ferrocenes; planar chirality; redox activity