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metal-organic compounds
Molecules of ferrocene-1,1′-diylbis(2-phenylethanedione), [Fe(C13H9O2)2], lie across twofold rotation axes. One of the oxygen atoms in each diketone unit acts as a bis-acceptor of intermolecular C-HO hydrogen bonds. Hydrogen bonds employing cyclopentadienyl C-H bonds as donors generate spirals of molecules around 31 axes, while those employing phenyl C-H bonds as donors generate two-dimensional sheets.