Study on fluorescence properties of rare earth complexes influenced bysteric effect

Abstract：The rare earth complexes Th(o-BrBA)3,Tb(m-BrBA)3 and Tb(p-BrBA)3 were synthesized using o-,m-,p-bromo benzoic acids (2-bromo benzoic acid,3-bromo benzoic acid and 4-bromo benzoic acid) as ligand,respectively.The UV spectra showed that the absorption ability of Th(m-BrBA)3 was the strongest.However,the fluorescent intensity of Th(o-BrBA)3 was the weakest.The effect of the molecular structure,the energy level of Tb3+ and energy transfer efficiency from ligands to Tb3+ were discussed to explain the experimental results.The results indicated that,due to the large atomic radius of bromine,the steric effect caused by the different substitution bromine on the benzene ring might strongly affect the bond length formed by the coordination atoms and Tb3+.The longer the bond length was,the lower the efficiency of energy transfer was,and the weaker the fluorescent intensity was. 作者： Author： YUAN Wei[1]  CUI Yumin[2]  SHI Ruijuan[2]  TAO Dongliang[2]  WANG Yongzhong[1]  ZHANG Wenbao[1]  CHEN Jitang[1]  SUN Lin[1]  LIU Shaoxuan[3]  XU Yizhuang[3] 作者單位： College of Chemistry and Chemical Industry, Fuyang Normal College, Fuyang 236041, ChinaCollege of Chemistry and Chemical Industry, Fuyang Normal College, Fuyang 236041, China;Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, ChinaCollege of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 期 刊： 稀土學報（英文版）   ISTICEISCI Journal： Journal of Rare Earths 年，卷(期)： 2011, 29(11) 分類號： P618.7 P575 Keywords： terbium complexes    bromo benzoic acid    steric effect    fluorescent spectrum    rare earths    機標分類號： O6 TF 機標關鍵詞： rare earth complexes    fluorescence properties    fluorescent intensity    benzoic acids    energy transfer    bond length    molecular structure    results    steric effect    atomic radius    energy level    UV spectra    different    benzene 基金項目： the National Natural Science Foundation of China，Anhui Science and Teelnology Program，Natural Science Foundation of Fuyang Normal College，Open fund of State Key Laboratory of Rare Earth Materials Chemistry and Applications Study on fluorescence properties of rare earth complexes influenced bysteric effect[期刊論文]  稀土學報（英文版） --2011, 29(11)The rare earth complexes Th(o-BrBA)3,Tb(m-BrBA)3 and Tb(p-BrBA)3 were synthesized using o-,m-,p-bromo benzoic acids (2-bromo benzoic acid,3-bromo benzoic acid and 4-bromo benzoic acid) as ligand,respec...

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