[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5322/JESI.2013.22.10.1273

Syntheses and Ion Selectivities of Dimeric Rhodamine 6G Chemosensors

Chang, Seung Hyun (Department of Chemistry and Applied Chemistry, Daegu University)
Choi, Jin-Wook (Department of Chemistry and Applied Chemistry, Daegu University)
Chung, Kwang-Bo (Department of Chemical Engineering, Hanseo University)

Publication Information

Journal of Environmental Science International / v.22, no.10, 2013 , pp. 1273-1278 More about this Journal

Abstract

Novel rhodamine 6G fluorescent chemosensors 1 and 2 for the detection of transition metal cations were synthesized through the condensation of rhodamine 6G ethylenediamine with each of 2-hydroxy-1-naphthaldehyde and 2,6-pyridinedicarbaldehyde, respectively. 1 and 2 were characterized using $^{13}C$ NMR, $^1H$ NMR and mass spectroscopy. Fluorometric and colorimetric measurements involving various metal ions revealed the ring opening of the rhodamine 6G spirocycle framework. In the absence of metal cations, 2 was colorless and non-fluorescent, whereas the addition of metal cations ( $Hg^{2+}$ and others) changed the color to pink, accompanied by the appearance of an orange fluorescence. The chemosensors exhibited high selectivity for $Hg^{2+}$ over other divalent first-row transition metals. The complexes of $Hg^{2+}$ with 1 and 2 were successfully isolated. A huge enhancement in the fluorescence for both one- and two-photon excitations makes these compounds suitable candidates to be used for fluorescent labeling of biological systems.

Keywords

Rhodamine 6G; Fluorescent; Colorimetric; Chemosensor; Mercury;

Citations & Related Records

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