Syntheses and Coordination Properties of (Thia)Calix[4]Arenes Bearing Single ω-Quinolin-8-Yl-Oligooxyethylene Pendant

Abstract

Four mono-quinolin-8-yl-substituted (thia)calix[4]arenes via oligooxyethylene spacers (1a–b and 2a–b) were synthesised conveniently in one step. Their structures and conformations were characterised by 1H NMR and ESI-MS spectra. Their coordination properties were studied by fluorescence spectra titration in CH3CN. All of them can form stable 1:1 complex with Zn(II) and Mg(II) ions, respectively. The stability constants of thiacalix[4]arene (2a and 2b) derivatives are higher than those of the calix[4]arene analog (1a and 1b).