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From the copper-catalyzed reaction of germanium powder with dichloromethane at 350 °C a mixture of alkylchlorogermanes is obtained, in which CH 3 GeCl 3 , CH 2 (GeCl 3 )2 (1) and (Cl 2 GeCH 2 ) 3  (2) are the major products. Treatment of 1 and 2 with LiAlH 4  in di-n-butyl or diethylether, resp., affords the hydrides CH 2 (GeH 3 ) 2  (3) and cyclic (H 2 GeCH 2 ) 3  (4), the latter along with the heterocycle H 2 Ge(CH 2 GeH 2 ) 2  (5). Compounds 3-5 have been identified by analytical and spectroscopic data, and the crystal structure of 4 has been determined by single crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Pmn2 1 , with two molecules in the unit cell (a = 8.663(1), b = 7.783(1), c = 6.124(1) Å). The molecules, which are in a chair conformation, have crystallographic mirror symmetry with bond angles slightly larger than tetrahedral and Ge-C distances of 1.944(6), 1.953(3) and 1.955(4) Å. The compounds show potential as substrates for plasma-enhanced chemical vapour deposition (PE-CVD) of amorphous germanium carbon alloys (a-Ge, C:H).

1,3-Digermapropan und 1,3,5-Trigermacyclohexan / 1,3-Digermapropane and 1,3,5-Trigermacyclohexane