|
Metal cation chemistry, life sciences, environmental science, and medicine, and many other important object of scientific research in the field of identification and detection of metal cations in the solution is one of the important tasks of analytical chemistry. In recent years, with the rapid development of cross-disciplinary, fluorescent probe and its sensing new materials as materials science and analytical chemistry point of integration concern, fluorescent probe provides a convenient, fast and cheap method for detection of metal ions, and having a high sensitivity and selectivity. In environmental science to analyze the chemical and life sciences and other fields have a wide range of applications. Porphyrin (H 2 TPP) compound with very good optical properties, is an ideal fluorescent substance having a high fluorescence quantum yield, a large Stokes shift, relatively long excitation (GT; 400 nm) and emission (GT; 600 nm) wavelength, a relatively long excitation and emission wavelengths is possible to reduce the interference of background fluorescence, fluorescence probe is worthy of further study. Based on this, we designed and synthesized containing a 2 - (methoxy) pyridine unit ratio of porphyrin derivatives fluorescent molecular probes, used for identification Zn 2 . Under normal circumstances, a porphyrin compound is used to identify the heavy metal ions, the porphyrin compound can be used for identification of the ratio of zinc ion. We investigated the response characteristics of the fluorescent probe for zinc ions, zinc ions in response linear range is 3.2 × 10 -7 -1.8 × 10 -4 mol / L, the detection The lower limit is 5.5 × 10 -8 mol / L. The experimental results show that, under neutral conditions (pH 4.0-8.0), the response of the compounds of the zinc ion is almost free from the influence of pH. In addition, the probe for zinc ions having a good selectivity. Naphthalimide derivatives because of their good optical properties: a high fluorescence quantum yield, large Stokes shift, a relatively long emission spectroscopy, etc., making it an ideal fluorescence probe molecule. Based on photoinduced electron transfer (PET) principle, we have designed and synthesized a new type of fluorescent probe, the probe has good selectivity and high sensitivity of mercury ion. We also investigated the response characteristics of the mercury ion fluorescent probes, probe response of mercury ion linear range is 6.8 × 10 -7 -5.2 × 10 -4 mol / L, the detection limit is 3.2 × 10 -7 mol / L . Design and Synthesis of a high selective recognition of a quinoline-based compound containing a carboxyl group 1, the compounds can be used as a ratio of fluorescent probes in ethanol / water (1:1, v / v) solution of zinc ions. When the presence of an excess of zinc ions, the probe fluorescence emission intensity of 13 times, the maximum fluorescence emission wavelength red shift 82 nm. Probe 1 and Zn 2 form a 1:1 complex, this experiment is based on this be on Zn 2 ratio type measurements. The analytical performance of the papers in this probe has been systematically studied. The results show that: the probe linear response range of 2.0 × 10 -6 -5.0 × 10 -5 mol / L Zn 2 The detection limit is 2.7 × 10 -7 mol / L. The probe used for actual samples of tap water and river water the Zn 2 testing, the results were satisfactory.
|