Environmental Detection Tool With Orgnic Chemosensor Material: Fluorescent Probe Toward Metal Cations

Y. Son, H. Kim, J. Bae and D. Lee
Chungnam National University, KR

Keywords: environmental detection, chemisensor, hazardous, heavy metal, fluorescence

Summary:

In the aspect of environmental hot issues, the detection toward hazardous heavy metals and the related compounds is very important work in the areas of organic sensor materials. A novel Rhodamine-based fluorescent chemosensor (probe 1) has been designed for the selective detection of Cu2+ ion and synthesized using Rhodamine B through two-step reactions. On the basis of the well-known ring-closed spirolactam (colorless, non-fluorescent) to ring-opened amide (colored, fluorescent) reaction, rhodamine derivatives have been extensively considered with an ideal model as chemosensor, that have been commonly utilized to prepare fluorophore materials toward various metal cations. Adding Cu2+ ion into a solution of probe 1 resulted in an obvious absorption spectral change (from colorless to pink). In addition, highly sensitive and selective colorimetric chemosensor probe 1 showed strong pink fluorescence emission with compared to other heavy metal cations such as Hg2+, Zn2+, Ag2+, Ba2+, Pb2+, and Fe3+. The properties of Cu2+ ion detection were monitored and analyzed in details. A type of metal complex formation was measured by Job’s plot method. Finally, electron distribution and energy level calculation such as HOMO and LUMO was computationally simulated using DMol3 program of Materials Studio 4.3 package.