Crystal structure of 9,9-di­ethyl-9H-fluorene-2,4,7-tricarbaldehyde

The title compound, C(20)H(18)O(3), crystallizes in the space group P2(1)/c with one mol­ecule in the asymmetric unit of the cell. The fluorene skeleton is nearly planar and the crystal structure is composed of mol­ecular layers extending parallel to the (302) plane. Within a layer, one formyl oxygen atom participates in the formation of a C(arene)—H⋯O bond, which is responsible for the formation of an inversion symmetric supra­molecular motif of graph set R (2) (2)(10). A second oxygen atom is involved in an intra­molecular C(arene)—H⋯O hydrogen bond and is further connected with a formyl hydrogen atom of an adjacent mol­ecule. A Hirshfeld surface analysis indicated that the most important contributions to the overall surface are from H⋯H (46.9%), O⋯H (27.9%) and C⋯H (17.8%) inter­actions.