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机构地区:[1]宁夏大学学术期刊中心,宁夏银川750021 [2]宁夏大学能源化工重点实验室,宁夏银川750021
出 处:《稀土》2010年第5期7-13,共7页Chinese Rare Earths
基 金:教育部科学技术研究重点基金资助项目(208159);宁夏高等学校科研基金资助项目(2007)
摘 要:为了研究Schiff类稀土配合物的组成和荧光性质,合成了N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L1),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L2),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯醚(L3)3种配体及其Eu(Ⅲ),Tb(Ⅲ)配合物。通过对配体和配合物的红外吸收、核磁共振、紫外吸收、元素分析、差热—热重、摩尔电导率及荧光光谱的测定分析了配合物的组成和性质。结果表明,配合物的组成为RE2(NO3)4.L4.2H2O(RE=Tb3+,Eu3+;L=L1,L2,L3),每个稀土离子与5个O、4个N配位,配位数为9,还有2个结晶水。室温下,Eu(Ⅲ),Tb(Ⅲ)配合物均有荧光发射,且Eu(Ⅲ)配合物发射出更强的Eu3+特征荧光,说明该类配体敏化Eu3+发光比Tb3+发光程度更大。In order to study the composition and fluorescence properties of Schiff bases and rare earth compleses, N, N' - bis (2 - hydroxy - 1 - naphthaldehyde) - 4,4' - diamino - diphenyl methane ( L1 ), N, N' - bis ( 2 - hydroxy - 1 - naphthal- dehyde) - 4,4' - diamino - diphenyl ether( L2 ) and N, N' - bis (2 - hyd - roxy - 1 - naphthaldehyde) - 4,4' - diamino - diphenyl sulphone( L3 )and their Eu ( Ⅲ ), Tb ( Ⅲ ) complexes have been synthesized. The composition and properties of the ligands and complexes were characterized by IR spectra, 1H - NMR, UV spectra, elemental analysis ,TG - DTA, molar conduc- tivity and fluorescence spectra. The results indicate that the general formula of the complexes is RE2 ( NO3 )4 ·L · 2H2O( RE = Th3+Eu3 + ; L = L1, L2, L3 ), one rare earth ion coordinated with five oxygen atoms and four nitrogen in each unit, the co- ordination number may be nine. The fluorescent properties of Eu( Ⅲ ) ,Th( Ⅲ ) complexes were determined at room tempera- ture. It indicated that the Eu(Ⅲ) complexes exhibit the stronger characteristic emissions of Eu3 +. This also shows that the lu- minescence sensitizing effect of the Schiff bases ligands to Eu3 + is better than that to Tb3 + .
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