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    Supramolecular interaction of diamino calix[4]arene derivative with nucleotides at the air-water interface

    Year: 2002

    Journal: Thin Solid Films 414 (2002) 72-77, 20111221

    Authors: Fang Liu, Guo-yuan Lu, Wei-jiang He, Min-hua Liu, Long-gen Zhu

    Organizations: aDepartment of Chemistry, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China bLaboratory of Colloid and Interface Science, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100101, PR China

    The properties of the monolayer of 5,11,17,23-tetra-tert-butyl-25,27-bis (2-aminoexthoxy)-26,28-dihydroxycalix[4]arene and its recognition capacity for 5´-AMP- and 5´-GMP2- at the air-water interface were investigated. π-A isotherms and relaxation experiments indicate that it is able to form stable monolayers on pure water and two nucleotide-containing subphases.Mor eover, the nucleotides in subphase are beneficial to the stability of its monolayer.The UV, CD, and FT-IR spectra of LB films from three subphases reveal that 5´-AMP- and 5´-GMP2- in subphase can be transferred onto the substrates along with the monolayer mainly via multiple hydrogen bonding and electrostatic interactions.The host-guest complexes of 5,11,17,23-tetra-tert-butyl-25,27-bis(2-aminoexthoxy)-26,28-dihydroxycalix[4]arene and nucleotides at the air-water interface were studied through the analysis of the X-ray photoelectron spectra data of LB films.The results indicate that 5´-AMP- and 5´-GMP2- were bound to y 2y the calixw4xarene monolayer in 1:1 and 1:2 molar ratio, respectively. Two intermolecular interaction patterns are proposed and the binding constants are estimated to be 1.4 ± 0.1x105 and 1.1 ± 0.2x105 M for 5´-AMP- and 5´-GMP2-, respectively.