title: Spectral study on the inclusion complex of cryptophane-E and CHCl3.
abstract: Cryptophane-E was synthesized from vanillin by a three-step method, and its absorption and fluorescence spectroscopic properties were determined. Two absorption bands at about 245-260 and 280-290 nm were observed for cryptophane-E and the fluorescence emission maxima were at 320-330 nm depending on the solvent used. The interaction of cryptophane-E with CHCl(3) was studied in detail by absorption and fluorescence spectroscopies. The results showed that cryptophane-E and CHCl(3) can easily form a stable 1:1 host-guest inclusion complex. Their binding constant (K) was determined by Benesi-Hildebrand equation and the nonlinear least squares fit method. The binding constant is largest in ethyl acetate, followed by dioxane and with acetonitrile as the smallest. In addition, the effect of guest volume on the host-guest inclusion complex was investigated. Guest molecules including CH(2)Cl(2) and CCl(4) were unable to form inclusion complex with cryptophane-E because of sizes mismatching with the host cavity.
authors.affiliation: Center of Environmental Science and Engineering Research, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, PR China.
authors.forename: Caihong
authors.initials: C
authors.lastname: Zhang
authors.forename: Weili
authors.initials: W
authors.lastname: Shen
authors.forename: Ruying
authors.initials: R
authors.lastname: Fan
authors.forename: Guomei
authors.initials: G
authors.lastname: Zhang
authors.forename: Shaomin
authors.initials: S
authors.lastname: Shuang
authors.forename: Chuan
authors.initials: C
authors.lastname: Dong
authors.forename: Martin M F
authors.initials: MM
authors.lastname: Choi
mesh_terms: D000042:Absorption; D000975:Antioxidants / Q000737:chemistry; D001547:Benzaldehydes / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry*; D002725:Chloroform / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D011083:Polycyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D000975:Antioxidants; D001547:Benzaldehydes; D002712:Chlorides; D011083:Polycyclic Compounds; D012997:Solvents; C545485:cryptophane E; D002725:Chloroform; C100058:vanillin