Synthesis and structures of complexes demonstrating the coordinative versatility of the 2,4-diimino-3-phosphinopentene anion (gamma-phosphino-beta-diketiminate).
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.
Burford
Neil
N
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3. Neil.Burford@dal.ca
D'eon
Mark
M
Ragogna
Paul J
PJ
McDonald
Robert
R
Ferguson
Michael J
MJ