title: Crystal structure of 2,2,3,3-tetra-methyl-1,1,1,4,4,4-hexa-phenyl-tetra-germane.
abstract: The mol-ecule of the title compound, C40H42Ge4, lies with its central Ge-Ge bond on an inversion centre giving rise to a zigzag backbone of four tetra-hedrally coordinated Ge atoms. The symmetrically independent Ge-Ge bonds are slightly shorter than in other organo-tetra-germanes whereas the Ge-CPh (Ph = phen-yl) and Ge-CMe (Me = meth-yl) distances have their usual values. In the crystal, (010) layers of Ph6Me4Ge4 mol-ecules with a parallel orientation of the Ge4 backbone exist, held together by van der Waals forces only. Main bond lengths in organo-substituted oligogermanes are compared.
authors.affiliation: Department of Chemistry, Moscow State University, 119991 Moscow, Russian Federation.
authors.forename: Kirill V
authors.initials: KV
authors.lastname: Zaitsev
authors.affiliation: Department of Chemistry, Moscow State University, 119991 Moscow, Russian Federation.
authors.forename: Sergey S
authors.initials: SS
authors.lastname: Karlov
authors.affiliation: Department of Chemistry, Moscow State University, 119991 Moscow, Russian Federation.
authors.forename: Galina S
authors.initials: GS
authors.lastname: Zaitseva
authors.affiliation: Moscow State University (Baku Branch), AZ1144 Universitet st. 1, Khojasan, Binagadi, Baku, Azerbaijan.
authors.forename: Ali
authors.initials: A
authors.lastname: Alizade
authors.affiliation: Department of Chemistry, Moscow State University, 119991 Moscow, Russian Federation.
authors.forename: Yuri L
authors.initials: YL
authors.lastname: Slovokhotov
keywords: crystal structure; layered structure; organo­tetra­germane; zigzag backbone