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Zn(II), Cd(II), Ni(II) and Mn(II) complexes of a new hexadentate ligand N 1 ,N 4 -bis(pyridoxylidene)triethylenetetramine have been synthesized. X-ray crystal structures show that in all the complexes the metal: ligand stoichiometry is 1:1 and the ligand coordinates in a di-deprotonated hexadentate manner through two phenolate oxygens, two imine nitrogens and two secondary amine nitrogen...
Two newly designed turn-on fluorescein-based chemosensors are highly sensitive and selective for Co 2+ and Ni 2+ in both absorption and emission modes, normally difficult to achieve with these paramagnetic ions. Binding to both ions is reversible, as indicated by the bleaching of the color when the metal is extracted with EDTA. Given the difficulty of designing enhanced fluorescent...
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