Diphosphine-phosphenium coordination complexes representing monocations with pendant donors and ligand tethered dications.
Homoatomic P-P coordinate bonding is exploited to prepare the first examples of triphosphorus monocations and tetraphosphorus dications using dimethylphosphenium or diphenylphosphenium Lewis acceptors with diphosphinomethane, diphosphinoethane, diphosphinohexane, or diphosphinobenzene ligands. Solid-state structures and spectroscopic characterization data for complexes involving bis(diphenylphosphino)methane ligands show coordination of only one donor site of the diphosphine ligand in the monocations, and chelate complexation is not observed. Tetraphosphorus dications are observed with longer diphosphines, in which the ligand tethers two phosphenium acceptors. The structural preferences between monocations with pendant phosphines and tethered dications are dependent on intramolecular steric interactions and the flexibility of the tether.
Burford
Neil
N
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4J3, Canada. Neil.Burford@dal.ca
Herbert
David E
DE
Ragogna
Paul J
PJ
McDonald
Robert
R
Ferguson
Michael J
MJ