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Relevant academic research and scientific papers

Competitive binding of Ba2+and Sr2+ to 18-crown-6 in a receptor with a 1-methoxyanthraquinone analogue as the other binding site

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

Interfacial electron transfer dynamics of two newly synthesized catecholate bound RuII polypyridyl-based sensitizers on TiO2 nanoparticle surface - A femtosecond pump probe spectroscopic study

Two new catecholate-bound RuII-polypyridine based sensitizers, (2,2′-bipyridine){ethyl 3-(4-hydroxyphenyl)-2-[(4′-methyl-2, 2′-bipyridinyl-4-carbonyl)amino]propionate}{4-[2-(4′-methyl-2, 2′-bipyridinyl-4-yl)vinyl]benzene-1,2-diol)}ruthenium(II) hexafluorophosphate (5) and [(2,2′-bipyridine)-(4-2,2′-bipyridinyl- 4-yl-phenol)-(4-{2-(4′-methyl-2,2′-bipyridinyl-4-yl)vinyl}benzene-1, 2-diol)]ruthenium(II) hexafluorophosphate (6) with secondary electron-donating groups (tyrosine and phenol, respectively) were synthesized and characterized. Steady-state optical absorption and emission studies confirm strong coupling between the sensitizers and TiO2 nanoparticles. Femtosecond visible transient absorption spectroscopy has been employed to study interfacial electron transfer (IET) dynamics in the dye-nanoparticle systems to explore the influence of the secondary electron-donating groups on IET dynamics. Electron injection into the conduction band of nanoparticulate TiO2 has been confirmed by detection of the conduction band electrons in TiO2 ([e-]TiO2CB) and radical cation of the adsorbed dye (D·+) in real time monitored by transient absorption spectroscopy. A single exponential and pulse-width limited (2 and by the recovery of the ground state bleach. BET dynamics in dye-TiO2 systems for complexes 5 and 6 have been compared with those of [bis(2,2′-bpy)-(4-{2-(4′-methyl-2, 2′-bipyridinyl-4-yl)vinyl}benzene-1,2-diol)]ruthenium(II) hexafluorophosphate (7), which does not have a secondary electron-donating group.