Abstract
The prepn. and ESR of radical complexes (I; MRn = BePh, MgPh, ZnPh, -BEt3, GaMe2, InMe2, SiMe3) are described. While the SiOMe3 deriv. could be obtained via 1-electron oxidn. of the corresponding 4,4'-(1H,1'H)-bipyridinylidene, the other complexes were prepd. by the reaction of 4,4'-bipyridine with K and the organometal MRn+1 or the halide XMRn in THF. Use of organocadmium or -thallium compds. in such a procedure leads to deposition of the metals. The Grignard reagents MgPh2 and BrMgPh reduce 4,4'-bipyridine in an electron transfer process to yield an unsym. complex. The new organometallic 4,4'-bipyridinium (violene) radical complexes can be incorporated into a series of related radicals which exhibits the sensitivity of the unpaired electron distribution towards metal coordination. on SciFinder(R)
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