The fluorescence quenching of molecules by analytes of interest, is a widely employed phenomenon in fluorescence sensing technology. Färster type dipole -dipole energy transfer from dye molecules to transition metal ions, provides a method of monitoring the concentration of these ions with some degree of selectivity. Each metal ion has a different absorption spectrum, hence, in principle it is possible to choose different fluorophores for each metal ion. In the present work, quenching studies of the carbocyanine dye DTDCI by transition metal ions in a viscous solvent and in Naflon polymer matrices are reported. The potential for fabricating near-infrared (NW) energy transfer sensors is assessed, particularly with regard to detecting copper ions in solution.Keywords:-infrared dyes, metal ion sensor, fluorescence quenching, Naflon polymer. INTRODUCTIONNW dyes are the subject of growing interest in the area of time-resolved fluorescence sensors. A main advantage in using them as sensors is the improvement in detection efficiency resulting from low background emission from fluorescent impurities when using NIR excitation. The application of MR dyes as sensors is especially advantageous when laser diodes are used as excitation sources, because of their small size, low cost, high intensity and high repetition rate. Optical fiber coupling can be utilized to allow remote analysis of potentially harmful chemicals.Typical NW dyes are the di-and tricarbocyanines which have aromatic or heteroaromatic ring structures linked by a polymethine chain possessing conjugated carbon/carbon double bonds. In this paper the fluorescence of the carbocyanine dye 3,3'-diethylthiadicarbocyanine iodide DTDCI is reported.The difficulties associated with the use of these N dyes are the small quantum yield when compared to many visible fluorescent dyes 1,2, and the photochemical changes observed in the spectroscopic properties when placed in aqueous solvents or other high polarity solvents. These changes include the appearance of additional bands in the absorption spectra which are attributed to dye molecule aggregation. It has been shown that the internal conversion and the cis/trans photoisomerization within the polymethine chain are the major nonradiative pathways in polymethine dyes.These processes can be an obstacle to using the carbocyanine dyes as sensors.The aim of this study is to use the carbocyanine dye as the sensor molecule for transition metal ions in different environments. The quenching of DTDCI fluorescence was employed to determine the ion concentration using Färster type quenching. We have already successfully demonstrated a metal ion sensor based on Förster energy transfer in the UV/VIS5, but extension to the MR would bring to bear the low cost spin-off technology associated with the optical communications industry. 290/SPIE Vol. 2388 O-8194-1735-1/95/$6.QO Downloaded From: http://proceedings.spiedigitallibrary.org/ on 10/06/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
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