| Mercury ion （Hg2+） has been proven to be toxic without showing any beneficialhealth effects for human beings by lots of literatures. Thus, many analytical methodshave been developed to detect Hg2+in the environment. Analytical methods likeatomic absorption spectroscopy, electrochemical methods, inductively coupledplasma atomic emission spectrometry and mass spectroscopy require specialequipment and laborious procedures.Fluorescent small-molecule sensors have been researched intensively due to highsensitivity, rapid response and good selectivity, and the molecular structures are easyto modify, which should induce them to exhibit different photophysical propertiesaccording to well-known principles, such as PET, ICT and desulfurization, etc. In thisthesis, a derivative of quinoline containing thiourea group was employed as aneffective fluorescent sensor for Hg2+.Chapter One focused on the importance of detecting Hg2+, showed generaldetection methods and made a brief review on fluorescence probes for Hg2+. Thefollowing Chapter Two gave a description of the synthesis of a novelquinoline-thiourea conjugate as a fluorescent sensor for mercury ion:1-phenyl-3-(quinolin-8-yl)thiourea （PQT）, and the molecular structure was characterized with1H NMR,13C NMR and MS. Finally, Chapter Three depicted the sensing properties ofPQT by the method of fluorescence in details. In the buffer solution ofpH=7.0（containing HEPES）, PQT shows high sensitivity and good selectivity to Hg2+over other metal ions. With the excitation of309nm, the fluorescence intensitydepends linearly on the concentration of Hg2+added in the range of1×10-7-1×10-5mol/L, and the detection limit is determined to be7.5×10-9mol/L. The recovery ratefor the real plants samples is95.37%-103.37%. |
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