title: Crystal structure of cyclomaltoheptaose (beta-cyclodextrin) complexes with p-aminobenzoic acid and o-aminobenzoic acid.
abstract: Crystal structures of cyclomaltoheptaose (beta-cyclodextrin) complexes with p-aminobenzoic acid and o-aminobenzoic acid have been determined by single-crystal X-ray diffraction. The space group of the beta-cyclodextrin-p-aminobenzoic acid complex is P2(1) with a host:guest stoichiometry of 1:1, and that of the beta-cyclodextrin-o-aminobenzoic acid complex is P1 with a stoichiometry of 2:3. The different structures of the guest molecules lead to the different molecular packing structures of the two complexes. Intermolecular hydrogen-bond interactions are the main force that stabilize the supramolecular systems. In both crystals, there are water molecules located near the cavity rims and in interstices between molecules of beta-cyclodextrin participating in formation of intermolecular hydrogen bonds.
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China. zhangym001@263.net
authors.forename: Yimin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Shanbao
authors.initials: S
authors.lastname: Yu
authors.forename: Feng
authors.initials: F
authors.lastname: Bao
mesh_terms: D010129:4-Aminobenzoic Acid / Q000737:chemistry*; D002236:Carbohydrate Conformation; D003460:Crystallization; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D047392:beta-Cyclodextrins / Q000737:chemistry*; D062367:ortho-Aminobenzoates / Q000737:chemistry*
chemical_list: D047392:beta-Cyclodextrins; D062367:ortho-Aminobenzoates; C031215:betadex; D010129:4-Aminobenzoic Acid