Arsinophosphonium cations from arsenium-phosphine and -bisphosphine coordination chemistry.
A new 14pi-electron tricyclic organoarsenium cation (5-hydrophenarsazinium, AN, C12H9AsN+) has been prepared in situ and used as a Lewis acceptor with trimethylphosphine, triphenylphosphine, bis(diphenylphosphino)methane (dppm), bis(dimethylphosphino)methane (dmpm), and 1,4-bis(diphenylphosphino)benzene (dppb) ligands. Solid-state structures and spectroscopic characterization data are reported for complexes of the general formula [AN-PMe3]+, [AN-PPh3]+, [AN-dppm]+, [AN-dppm-AN]2+, [AN-dmpm-AN]2+, and [AN-dppb-AN]2+ as tetrachlorogallate salts. Depending on reaction stoichiometry, dppm forms adducts at one or both of the donor sites. Structural comparisons with analogous complexes of phosphenium cations provide interesting similarities and differences.
Burford
Neil
N
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4J3, Canada. Neil.Burford@dal.ca
Ragogna
Paul J
PJ
Sharp
Kendall
K
McDonald
Robert
R
Ferguson
Michael J
MJ