title: Amidofluorene-appended lower rim 1,3-diconjugate of calix[4]arene: synthesis, characterization and highly selective sensor for Cu(2.).
abstract: Functionalization of calix[4]arene with amidofluorene moieties at the lower rim led to formation of the 1,3-diconjugate of calix[4]arene L as a novel fluorescent chemosensor for Cu(2+). The receptor molecule L exhibited a pronounced selectivity towards Cu(2+) over other mono and divalent ions. The formation of the complex between L and Cu(2+) was evaluated by absorption, fluorescence and (1)H NMR spectroscopy. The sensor L showed a remarkable color change from colorless to purple and a fluorescence quenching only upon interaction with Cu(2+). The 1:1 stoichiometry of the obtained complex has been determined by Job's plot. The association constant determined by fluorescence titration was found to be 1.8 × 10(6) M(-1). The sensor showed a linear response toward Cu(2+) in the concentration range from 1 to 10 µM with a detection limit of 9.6 × 10(-8) M.
authors: Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
authors: Rahman
authors: R
authors: Hosseinzadeh
authors: Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
authors: Mohammad
authors: M
authors: Nemati
authors: Chemistry and Chemical Engineering Research Center of Iran (CCERCI), Tehran, Iran.
authors: Reza
authors: R
authors: Zadmard
authors: Department of Molecular and Cell Biology, Faculty of Basic Science, University of Mazandaran, Babolsar, Iran.
authors: Maryam
authors: M
authors: Mohadjerani
keywords: calix[4]arene; chemosensor; copper ions; fluorene; fluorescence