Two new quaternary ammonium salts of indolizine derivatives 4a(1-{2-[N’-(3-cyano-indolizine-1-carbonyl)-hydrazino]-2-oxo-ethyl}-pyridinium; chloride) and 4b(1-{2-[N’-(3-Cyano-indolizine-1-carbon-yl)-hydrazino]-2-oxo-ethyl}-2-methyl-pyridinium;chloride) as fluorescent sensors for Cu2+were synthesized. The structures of the two compounds were determined by IR, 1 H NMR, MS and elemental analysis. Their UV and fluorescence spectra were measured. The influences of sixteen metal ions such as Cu2+, Zn2+, Ca2+, Cr3+, Co2+, Al3+, Mn2+, Ni2+, Ba2+, Hg2+, Fe3+, Cd2 +, Mg2+, Pb2+, Li+ and Ag+on their fluorescence properties were studied. Spectroscopic studies revealed that the two compounds had rather strong affinity toward Cu2+. The specificities of the two probes toward Cu2+were determined. Compound 4a nearly no fluorescence intensity changes were observed in emission spectra together with Zn2+, Ca2+, Co2+, Mn2+, Ni2+, Ba2+, Hg2+,Cd2+, Mg2+, Pb2+, Li+and Ag+, respectively. Compound 4b nearly no fluorescence intensity changes were observed in emission spectra together with Zn2+, Ca2+, Cr3+, Co2+, Al3+, Mn2+, Ni2+, Ba2+, Hg2+, Cd2+, Mg2+, Pb2+, Li+and Ag+, respectively. However, under identical conditions, the results showed that compounds 4a and 4b had fluorescence quenching together with Cu2+. So we have developed two new fluorescent sensors(4a and 4b). They showed high sensitivity and selectivity toward Cu2+ in aqueous solution.%设计合成了2个新型水溶性中氮茚季铵盐化合物4a{氯化2-[N'-(3-氰基-中氮茚-1-甲酰基)肼基]酰乙基-1-吡啶鎓盐}和4b{氯化2-[N'-(3-氰基-中氮茚-1-甲酰基)肼基]酰乙基-1-(2-甲基吡啶)鎓盐}，采用红外光谱、核磁共振、质谱和元素分析对其进行了结构表征，并研究了它们的光谱性质。选取 Cu2+， Zn2+， Ca2+， Cr3+， Co2+， Al3+， Mn2+， Ni2+， Ba2+， Hg2+， Fe3+， Cd2+， Mg2+， Pb2+， Li+和Ag+等16种常见金属离子，对2个化合物进行了离子识别实验。结果表明，化合物4a和4b在一定浓度范围内对铜离子均具有良好的选择性识别能力，受常见离子干扰小。由于空间位阻的影响，化合物4a具有比4b更高的灵敏性。
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