138473-67-3Relevant articles and documents
Competitive binding of Ba2+and Sr2+ to 18-crown-6 in a receptor with a 1-methoxyanthraquinone analogue as the other binding site
Banerjee, Tanmay,Suresh, Moorthy,Ghosh, Hirendra N.,Das, Amitava
scheme or table, p. 4680 - 4690 (2011/11/29)
Owing to their immense biological significance, development of sensors for the selective detection of alkaline earth metal ions has attracted vast research interest. In this article we have reported the synthesis, characterisation and ion binding studies of a new RuII-polypyridyl-crown-anthraquinone complex (5). Studies confirm selective binding of BaII, Sr II and CaII ions, with KaBaa2+ > KaSra2+ >> KaCaa2+, over all other metal ions, to the crown ether moiety and not to the methoxy anthraquinone component, the latter being the second binding site available and known for its affinity towards alkaline earth metal ions from one of our previous reports. A new RuII-polypyridyl complex with two probable binding sites for metal ions has been synthesised to which Ca2+, Sr2+ and Ba2+ were found to bind selectively over all other alkali, alkaline earth, transition and lanthanide metal ions. Studies also confirmed binding of these metal ions solely to the 18-crown-6 and not to the methoxyanthraquinone moiety known to bind alkaline earth metal ions. Copyright
New Alkynyl- and Vinyl-linked Benzo- and Aza-crown Ether-bipyridyl Ruthenium(II) Complexes which Spectrochemically recognize Group IA and IIA Metal Cations
Beer, Paul D.,Kocian, Oldrich,Mortimer, Roger J.,Ridgway, Christopher
, p. 2629 - 2638 (2007/10/02)
A new alkynyl-linked bis(benzo-15-crown-5) bipyridyl ligand and new mono- and bis-benzo-15-crown-5 and aza-15-crown-5 bipyridyl ligands containing trans-conjugated olefinic linkages between the crown ethers and the 4,4'-disubstituted 2,2'-bipyridine (bipy) moieties have been synthesised.The corresponding 2 and 2 complexes have been prepared and the latter electropolymerized onto optically transparent conducting glass electrodes.Electronic absorption and fluorescence-emission spectroscopic measurements have demonstrated spectrochemical recognition of Group IA and IIA metal cations by the novel functionalized crown ethers both as solution complexes and as polymeric films.The λmax and ε values for both the low-energy ligand-based ?-?* transition and the metal-to-ligand charge transfer band observed for the complexes are sensitive to the binding of sodium and magnesium cations.The spectral measurements further demonstrate the presence of residual unsaturated linkages in the electropolymerized films, providing a technique that could be applied to probe the mechanisms and efficiencies of such electropolymerizations.
