Date of Award
College of Science
Type of Degree
Michael P. Castellani
For two decades much research has been concentrated on open-shell transition metal complexes as chemical intermediates. To date, most efforts have concentrated on electron deficient, 17-electron (17e) compounds; however past research has shown that electronically supersaturated, 19-electron (19e) complexes can also participate as intermediates in many reactions. Yet, excluding (C5 H5)Fe(C6 H6) type complexes, very few of these compounds have been prepared.2,3 To better understand the nature of 19e, the preparation of another series of compounds is desirable.
The addition of the bidentate Lewis bases 1,2- bis(dimethylphosphino)ethane (dmpe) or 1,2-bis(diphenylphosphino)ethane (dppe) to a mixture of [(C5 R5)M(CO)3] x (X= 2 for R= H, Me, Ph; M = Cr, Mo and X=1 for M=Cr, R=Ph) and [Cp2 Fe]PF6, produces [(C5 R5)M(CO)2dmpe]+ or [(C5 R5)M(CO)2dppe]+ except for M=Cr, R=Ph, respectively (eq 4). (C5 R5) M(CO)3 + L2 + Cp2 Fe+ → (C5 R5) M(CO)2(L2) +CO + Cp2 Fe.
Dearman, Brian, "Sythesis and Characterization of [(C5R5) M (CO)2 (L2)]+: R=H, Me and Ph; M=Cr and Mo; L2=dmpe and dppe" (2002). Theses, Dissertations and Capstones. 560.