Azadithiacrown ether based ditopic receptors capable of simultaneous multi-ionic recognition of Ag~+ and Hg~(2+)

摘要

Novel azadithiacrown ether containing bis(styryl)pyridinium dyes were synthesized and their complexation with different transition metal cations was investigated. It was found that the compounds give a selective ratiometric optical response in the presence of silver (1) and mercury (11) cations. Evidence was given for the occurrence of two stoichiometrics: LM and LM2. Moreover, the formation of a mixed complex [Ag~+LHg~(2+)] containing both Ag~+ and Hg~(2+) cations simultaneously was demonstrated. Optical spectroscopy was used to estimate stability constant values of the complexes, NMR spectroscopy data allowed us to offer a model of spatial arrangement of the obtained species.