| 초록 |
Rhodamine fluorophore has attracted considerable interest from chemists on account of its strong emission. A lot of Rhodamine-derivatives have been developed for the detection of metal ions(Cu²⁺, Hg²⁺, Al³⁺, Ca²⁺). For the selective recognition of a heavy metal ions, sulfur-based and oxygen-based functional groups were considered during Rhodamine derivation. Metal coordination opens the ring of Rhodamine derivative to change absorptive and emissive properties. The ring opening and ring closure reactions are reversible depending on metal species and their concentration. We measured complex constants of Rhodamine and metal ions and compared according to the number of heteroatom (O, S) bound to Rhodamine. Rhodamine hydrazones with several sulfur groups exhibited a selective response to Hg²⁺. Fluorescent silica nanoparticles were prepared through covalent binding of the Rhodamine to NH₂-rich silica. The metal binding of silica particles viewing fluorescence is discussed. |
