B. R. Jali, K. Masud, J. Baruah
Mar 4, 2013
Citations
0
Influential Citations
21
Citations
Journal
Polyhedron
Abstract
Abstract Interactions of various metal ions with pyridine tethered 1,4-naphthoquinone derivatives ( 1 – 4 ) are studied by fluorescence spectroscopy. The fluorescence emission of 2-(pyridine-2-yl-methylamino) naphthalene-1,4-dione ( 1 ) is influenced by various metal ions and show highly selective fluorescence emission with Mn 2+ ions and fluorescence ON and OFF states can be generated at different concentrations of Mn 2+ ions. Sequential addition of Ni 2+ and Mn 2+ ions to a solution of 1 also generates ON and OFF emission states. The fluorescence responses towards the metal ions by two isomers 2-(pyridine- n -yl-methylamino)naphthalene-1,4-dione ( n = 3,4) are non-specific. The 2-(pyridine-2-yl-ethylamino)naphthalene-1,4-dione ( 4 ) shows fluorescence response to various metal ions; but its fluorescence response upon interaction with cadmium ions is very unique. Three stages in emission upon increase in concentration of Cd 2+ ions, namely OFF–ON–ON are observed.