Electrochemical synthesis of polygermanes

Electroreductive Synthesis of Polysilanes with Ordered Sequences

“…The electroreduction systems using Al or Cu anode in other electrolytes (Al anode/Bu4NCl/DME [24], Al anode/LiCl/THF-HMPT [25], or Cu/Bu4NClO4/DME [26]) have been also reported, however, the molecular weight of the resulting polysilanes is relatively low. Other than Mg electrodes, the use of Ag anode and Pt cathode in DME containing Bu4NCLO4 is also reported to be effective to obtain high molecular weight polysilane [27,28]. The effect of monomer concentration was investigated in order to obtain high molecular weight polysilane ( Table 5).…”

Electropolymerization of Polysilanes with Functional Groups

“…However, the mechanism by electrochemical route is scarcely reported 16 . According to above-mentioned, we speculate the mechanism might be divided into two parts.…”

Organometallic Polymers of Germanium, Tin and Lead

“…The selection of the cathode material was reported to be very important for the outcome of the reactions. It was shown that polygermanes with phenyl groups or short alkyl substituents 55 such as methyl, ethyl or propyl gave relatively low yields, low current efficiencies and low molecular weights. In contrast, poly(dibutyl)-, poly(dipentyl)-and poly(dihexyl)germanes were synthesised in high yields, with high current efficiencies and with molecular weights in the range of M w = 10 × 10 3 to 15 × 10 3 .…”

“…They are thermally stable, fairly resistant towards oxidation and hydrolysis. Poly(dihexyl)germane 55 was found to be stable in toluene at 100°C. Thermogravimetric analyses of poly(alkyl, phenyl)germanes and polygermynes 35,66,69 revealed that weight loss starts at temperatures around 230 to 285°C, and their residue weights decreased around 50% upon heating to 500°C.…”

“…In solution, poly(dialkyl)germanes such as (n-Hex 2 Ge) n , (n-Pen 2 Ge) n and (n-Bu 2 Ge) n show a distinct thermochromic behaviour 31,55 . The λ max value of (n-Hex 2 Ge) n in pentane gradually shifts from λ max = 340 nm at room temperature to λ max = 350 nm at −60°C.…”