title: Investigation on the inclusion interaction of 4-sulfonatocalix[n]arenes with 1-(4-nitrophenyl)piperazine.
abstract: The inclusion behaviors of 4-Sulfonatocalix[n]arenes (SCXn) (n=4, 6, 8) with 1-(4-nitrophenyl)piperazine (NPP) were investigated by UV spectroscopy and fluorescence spectroscopy at different pH values (pH=3.05, 6.50, 8.40). The UV absorption and fluorescence intensity of NPP remarkably increased in presence of SCXn revealing formation of the inclusion complexes between NPP and SCXn. Moreover, the formation constants (K) of inclusion complexes were also determined by the non-linear fitting method, and the obtained data showed that the formation constants decreasedgradually with the increasing of the pH value. When the pH value was 3.05, the formation constant of NPP with SCX8 reached a maximum of 1.7×10(7) L mol(-1). The stoichiometric ratio was verified to be 1:1 by the continuous variation method. Meanwhile FT-IR and DSC analysis also indicated that NPP could form the inclusion complex with SCXn. In order to explore the inclusion mechanism of NPP with SCXn, 1H NMR and molecular modeling studies were carried out and experimental results showed that the part of benzene ring of NPP penetrated into the hydrophobic cavity of SCXn.
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Yongbin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China. Electronic address: chao@sxu.edu.cn.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Chao
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Shuhui
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Penghao
authors.initials: P
authors.lastname: Xu
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Hongfang
authors.initials: H
authors.lastname: Wang
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China.
authors.forename: Diansheng
authors.initials: D
authors.lastname: Liu
mesh_terms: D065966:Absorption, Physicochemical; D047250:Calixarenes / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008958:Models, Molecular; D008970:Molecular Weight; D009578:Nitrobenzenes / Q000737:chemistry*; D000077489:Piperazine; D010879:Piperazines / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C000595696:1-(4-nitrophenyl)piperazine; D009578:Nitrobenzenes; D010879:Piperazines; D047250:Calixarenes; D000077489:Piperazine
keywords: 1-(4-Nitrophenyl)piperazine; 4-Sulfonatocalix[n]arenes; Fluorescence spectroscopy; Inclusion complex; UV spectroscopy