The title compounds Si(CHO) () and Ge(CHO) () are di-hydro-furyl compounds of silicon and germanium and are useful building blocks for the functionalization of these elements. Both structures crystallize in space group 2/ in the monoclinic crystal system with two mol-ecules in the asymmetric unit: the Si and Ge atoms adopt slightly distorted tetra-hedral geometries, while the CHO moieties exhibit shallow envelope conformations. Through a Hirshfeld surface analysis of the structures, inter-actions within the crystal packing could be elucidated: compound features a polymeric chain in the (101) plane C-H⋯O hydrogen bonds whereas in C-H⋯O hydrogen bonds create a polymeric chain in the (010) plane.
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