Molecular structures of a siladigermirane and a cyclotrigermane

Article abstract of DOI:10.1021/om00039a056

The crystal molecular structures of hexamesitylsiladigermirane (1, SiGe₂MeS₆, Mes = 2,4,6-trimethylphenyl) and hexamesitylcyclotrigermane (2, Ge₃Mes₆) have been determined by X-ray analysis. The crystals of 1·2CH₂Cl₂ (1) and 2·2CH₂Cl₂ (2) are isomorphous and isostructural and crystallize in monoclinic space group C2/c with Z = 4 of dimensions a = 20.659 (3) A?, b = 11.827 (2) A?, c = 23.288 (3) A?, β = 105.30 (1)°, and V = 5488.4 A?³ for 1 and a = 20.657 (4) A?, b = 11.812 (2) A?, c = 23.289 (3), β = 105.34 (1)°, and V = 5479.8 A?³ for 2. The three metal atoms of 2 form an equilateral triangle with a mean Ge-Ge bond length of 2.538 (2) A?. The silicon atom in the SiGe₂ core of 1 is evenly disordered over the three sites with a resulting metal-metal mean bond distance of 2.508 (3) A?. The molecular structures of these compounds are discussed.