Crystal structures and Hirshfeld surface analyses of tetrakis(4,5-dihydrofuran-2-yl)silane and tetrakis(4,5-dihydrofuran-2-yl)germane

The title compounds Si(C4H5O)(4) (1) and Ge(C4H5O)(4) (2) are dihydrofuryl compounds of silicon and germanium and are useful building blocks for the functionalization of these elements. Both structures crystallize in space group P2(1)/n in the monoclinic crystal system with two molecules in the asymmetric unit: the Si and Ge atoms adopt slightly distorted tetrahedral geometries, while the C4H5O moieties exhibit shallow envelope conformations. Through a Hirshfeld surface analysis of the structures, interactions within the crystal packing could be elucidated: compound 1 features a polymeric chain in the (101) plane via C-H center dot center dot center dot O hydrogen bonds whereas in 2 C-H center dot center dot center dot O hydrogen bonds create a polymeric chain in the (010) plane.