Germanium powder reacts slowly with 3,5-di-tert-butyl-1,2-benzoquinone (dbbq) in refluxing toluene to give products whose composition depends on the initial mole ratio of the reactants. When Ge : dbbsq = 1 : 2, the solid product is a monoradical + diradical species, but in non-aqueous solvents this converts to a diamagnetic oligomer. Treatment with 2,2′-bipyridine, or monodentate nitrogen donors (= L) gives diamagnetic germanium(IV) derivatives Ge(dbc)2L2 (dbc2- = 3,5-di-tert-butylcatecholate dianion). When the initial Ge : dbbq mole ratio = 1 : 3, the product is the diradical Ge(dbbsq·)2(dbc). The reaction of Ge and 4 dbbq, or the treatment of GeX4 (X = Cl, Br) with 4 moles of Na(dbbsq·), gives a product identified as Ge(dbbsq·)2(dbc)(dbbq), but the structure of this compound is unclear. The solid state and solution properties of these unusual compounds are discussed in the light of 1H NMR and electron spin resonance (ESR) spectroscopy.
|Number of pages||7|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - 2001|
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