title: Synthesis and structures of complexes demonstrating the coordinative versatility of the 2,4-diimino-3-phosphinopentene anion (gamma-phosphino-beta-diketiminate).
abstract: The synthesis and characterization of a 2,4-diimino-3-phosphinopentene anion (gamma-phosphino-beta-diketiminate) is reported and enables diversification of the beta-diketiminate ligand framework, which has been widely employed across the periodic table. Phosphines are observed to adopt the gamma-position of the ligand rather than the N,N' chelate. While aluminum and lithium adopt the familiar N,N' chelate arrangement with the new 2,4-diimino-3-phosphinopentene anion ligand, reactions with AsCl(3) or SbCl(3) result in substitution at the beta-methyl position on the ligand backbone, realizing novel P-->E (E = As or Sb) intramolecular coordination. The chemistry of the 2,4-diimino-3-phosphinopentene anion can be monitored by the (31)P NMR chemical shifts, which are distinctively diagnostic of the coordinative engagement of the ligand.
authors.affiliation: Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3. Neil.Burford@dal.ca
authors.forename: Neil
authors.initials: N
authors.lastname: Burford
authors.forename: Mark
authors.initials: M
authors.lastname: D'eon
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Ragogna
authors.forename: Robert
authors.initials: R
authors.lastname: McDonald
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Ferguson