CRYSTAL AND MOLECULAR-STRUCTURE OF THE INCLUSION COMPOUND BETWEEN 1,1'-BINAPHTHYL-2,2'-DICARBOXYLIC ACID AND ACETYLACETONE (1 1)/

The lattice type crystalline inclusion compound of 1,1'-binaphthyl-2,2 '-dicarboxylic acid (BNDA) with acetylacetone (AcAc) 1:1 has been inve stigated by single crystal X-ray diffraction. AcAc is present as the e nolic tautomer, stabilized by a notably short intramolecular hydrogen bond. This H-bond closes a six-membered ring with delocalization of th e system of conjugated double bonds. In the crystal the AcAc molecules are incorporated into channels, delimited by bulky binaphyl moieties, in a hydrogen-bonded framework of BNDA, and they do not show any diso rder. The strictly stoichiometric host:guest ratio seems to be enforce d by packing forces only.