Abstract
Metal ion sensing ability of 2-(4′-N,N-dimethylaminophenyl)imidazo[4,5-b] pyridine (DMAPIP-b) was investigated by absorption and fluorescence techniques. Alkali metal ions do not cause significant change in either the absorption or the fluorescence spectrum of DMAPIP-b, but red shifts occurred in presence of alkaline earth metal ions. Paramagnetic metal ions such as Ni2+ and Co2+ turn “OFF” the normal emission. On the other hand, Zn2+, upon complexation with DMAPIP-b produces significant red shift. It changes the initial “ON” normal emission of DMAPIP-b to “ON” intramolecular charge transfer (ICT) emission. Zn2+ ion also shows higher affinity toward DMAPIP-b than other metal ions. Therefore, DMAPIP-b can act as an efficient sensor for zinc ion. The association constants and the NMR spectra further substantiate our conclusion. The utility of the fluorophore in sensing zinc ions inside living cell is also demonstrated.
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