合成了2 ′,3′和4′-硼酸基苯甲醛-7-(8-羟基-5-磺酸基)喹啉腙衍生物(化合物1～3),研究了硼酸基团取代位置对主体分子识别金属离子客体性能的影响,比较了不同主体分子与Pb2+结合能力的差异.研究结果表明,在pH=7.0的KH2 PO4 -NaOH缓冲溶液中,3种腙衍生物对Pb2+均具有选择性识别作用,主客体分子间形成1∶1型的发光配合物.其中邻位取代的化合物1与Pb2+的结合能力比化合物2和3强,配合物1-P2+的最大发射波长为477 nm,稳定常数为1.1 ×103 L/mol.其它金属离子如Cu2+,Mn2+,Mg2+,Fe2+,Ca2+,C02+,Ni2+,Hg2+,Cd2+和Ag+等对主体分子荧光光谱的影响较小.同时,荧光强度的变化值与p2+浓度在0.36～ 10 μmol/L范围内呈现良好的线性关系,相关系数R=0.9976(n=16),检出限为0.23 μmol/L.将此方法用于环境水样中Pb2+的测定,回收率为92％～108％.%2', 3' and 4'-borono-benzaldehyde-7-( 8-hydroxy-5-sulfoacid) quinoline hydrazone derivatives (1-3) were synthesized. The influences of host molecules with boric acid at different replace positions on the recognition of metal ions was investigated. The combining ability of host compounds with lead ion was compared. Research results showed that 2'-borono benzaldehyde-7-(8-hydroxy-5-sulfoacid) quinoline hydrazone (1) possessed highly selective binding and recognition to Pb.2+in the KH2PO4-NaOH buffer solution with a pH value of 7. 0. The 1 : 1 complexes between host 1 and lead ion formed and they emitted strong fluorescence. The binding ability of host 1 with Pb2+ was the strongest among hosts 1-3. The emission wavelength of complex 1-Pb2+ was 477 nm and the binding constant was 1. l×l03 L/mol. The presence of the other metal ions led fluorescent spectra of hosts 1-3 little change, for example Mn2+ , Cu2+, Mg2+, Fe2+, Ca2+, Co2+, Hg2+, Ni2+, Cd2+, Ag+ and so on. Fluorescence intensity and the concentration of Pb2 + presented good linear relationship from 0. 36 μrnol/L to 10 μmol/L with a correlation coefficient of 0. 9976(n= 16) , the detection limit of method was 0. 23 μmol/L. The method was used to detect Pb2+in water sample from environment with the recovery of 92% -108%.
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