ELECTRON-TRANSFER FROM RIEKE CADMIUM YIELDING CD2-RADICAL SYSTEMS( COORDINATED AND ION ASSOCIATED ANION)

The very reactive Rieke cadmium metal was allowed to react under vacuu m with benzoquinone in tetrahydrofuran. This resulted in the formation of several different paramagnetic species whose EPR spectra prove the m to have doublet multiplicities. The tetrahedral coordination sphere of each of these species consists of three THF molecules and an anion radical that is either asymmetrically coordinated or symmetrically coo rdinated to the metal dication. This latter species yields a Cd-111 hy perfine splitting of 6.86 G. The second anion radical lies outside thi s coordination sphere, and it can be either asymmetrically ion associa ted with or dissociated from the tetrahedral metal complex. FLU specie s have the general formula [Cd(C6H4O2.-)(THF)(3)](+),C6H4O2.-) or {[Cd (C6H4O2.-)(THF)(3)](+) + C6H4O2.-}.