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机构地区:[1]温州大学化学与材料工程学院,温州325035
出 处:《科学通报》2014年第17期1621-1624,共4页Chinese Science Bulletin
基 金:温州大学有机化学浙江省重中之重基金资助
摘 要:以水杨醛型希夫碱N,N′-双(5-溴-3-甲氧基-水杨醛)-1,3-乙三胺(H2L)为配体,合成了3个3d-Yb配合物[ZnYbL(NO3)2(OAc)](1),[Zn4Yb2L4(1,4-BDC)2]·[Yb(NO3)5(H2O)](2)和[CuYbL(NO3)2(OAc)(CH3OH)](3).六核配合物2是由二核配合物1和对苯二甲酸(1,4-BDC)反应而成,晶体结构表明,桥联配体对苯二甲酸将2个三核Zn2Yb单元连结起来,构筑了含更多金属核数的配合物2.荧光性质研究表明,在配合物1和2中,由Zn/L组成的发色基团对Yb3+离子的近红外发光有敏化作用,配合物2的稀土荧光发射略强于配合物1.在配合物3中,Cu2+离子的存在对稀土荧光具有淬灭作用.Three heterometallic 3d-Yb complexes [ZnYbL(NO3)2(OAc)] (1), [Zn4Yb2L4(1,4-BDC)2]·[Yb(NO3)5(H2O)] (2) and [CuYbL(NO3)2 (OAc)(CH3OH)] (3) were synthesized from salen Schiff-base ligand N,N'-bis(5-bromo-3-methoxysalicylidene)propylene-1,3-diamine (H2L). The hexanuclear complex 2 was constructed from the binuclear complex 1 and 1,4-benzenedicarboxylate (1,4-BDC). The crystal structure of 2 shows that two 1,4-BDC groups link two trinuclear Zn2Yb units, resulting in the higer nuclearity complex. The study of luminescence properties of these complexes indicate that, in 1 and 2, the Zn/L units can efficiently transfer energy to the lanthanide centers, resulting in the NIR emissions of Yb^3+ ions. The NIR emission of 2 is stronger than that of 1. In 3, the 3d block metal ion (Cu^2+) introduced into the complex can quench the NIR emission of Yb3+ ion, probably due to ligand→d or f→d energy transfer.
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