A new electrochemical methodology allows to easily generate aroyloxy radicals from their corresponding aromatic carboxylic acids.

A series of germanes Ar 3 GeX, containing electron-withdrawing substituents [Ar = p-FC 6 H 4 , 1a−d, 1a (X = Cl), 1b (X = Br), 1c (X = H), 1d (X = NMe 2 ); p-F 3 CC 6 H 4 , 2a−d, 2a (X = Cl), 2b (X = Br), 2c (X = H), 2d (X = NMe 2 )], was synthesized and used to prepare symmetrical digermanes Ar 3 Ge−GeAr 3 , (p-FC 6 H 4 ) 3 GeGe(C 6 H 4 F-p) 3 (3), and (p-F 3 CC 6 H 4 ) 3 GeGe(C 6 H 4 CF 3 -p) 3 (4) and trigermane [(p-F 3 CC 6 H 4 ) 3 Ge] 2 Ge(C 6 F 5 ) 2 ( 5) by hydrogermolysis reaction. The properties of all compounds were investigated by multinuclear NMR and for oligogermanes by UV/vis and fluorescence spectroscopy, as well as by electrochemical methods. In addition, the molecular structures of 1a, 1b, 2b, 2c, and 3−5 were studied by X-ray diffraction analysis. Compound 5 showed a significantly shifted UV/visible absorption to the red field in comparison with previously described derivatives.

The optical( UV/Vis absorbance, fluorescence in the solid state and in solution) and semiconducting properties of an umber of di-and trigermanes as well as relateds ilicon-andt

The linear oligogermyl amide 2, Ph3GeGeMe2NMe2, was obtained by reacting Ph3GeLi with 1, Me2Ge(Cl)NMe2. The amide 2 was used for the synthesis of molecular oligogermanes 3, Ph3GeGeMe2Ge(C6F5)3, and 4, [Ph3GeGeMe2]2Ge(C6F5)2, containing electron donor (Me, Ph) and acceptor (C6F5) groups, by using a hydrogermolysis reaction in n-hexane. The molecular structures of 3 and 4 were studied by XRD. It was shown that, in its crystal form, 3 forms wide channels, in which the solvated nonpolar n-hexane molecule is present. The NMR (1 H, 13 C and 19 F), optical (UV/vis absorption, luminescence) and electrochemical (cyclic voltammetry) properties of both compounds were also studied. The impact of the substitution type (at the end of the compound, such as in 3, or within the compound, such as in 5, on the physical properties was also studied.