一种新型Eu3+ 和Zn2+ 双金属杂核配合物的结构与发光性质

合成了一种新型双金属杂核配合物Eu(TTA)3Zn(Salen).H2O(Salen=双水杨醛缩乙二胺,TTA=2-噻吩甲酰三氟丙酮),并对其进行了结构和荧光性能表征.配合物的晶体属于三斜晶系,Pī空间群.中心Eu(Ⅲ)离子与六个TTA分子的氧原子和Salen分子的两个酚氧原子配位,形成8配位的扭曲四方反棱柱构型.Zn(Ⅱ)离子与Salen分子中的两个酚氧原子和两个氮原子以及一个水分子配位,形成五配位的扭曲的四方锥构型.配合物Eu(TTA)3Zn(Salen).H2O的发光量子效率(18.0%)较配合物Eu(TTA)3.2H2O(12.5%)发光量子效率有明显提高,说明第二配体Zn(Salen).H2O对中心离子有较强的敏化发光作用.

Structure and Photoluminescent Properties of a Novel Eu3+ - Zn2+ Heteronuclear Complex

A new heteronuclear complex Eu(TTA)_(3)Zn(Salen)·H_(2)O(where TTA is 2-thenoyltrifluoro acetone,Salen is N,N-disalicylidene ethylenediamine) was synthesized and characterized by X-ray diffraction.This complex crystallized in monoclinic with space group of Pī.Each Eu~(3+)ion is eight coordinated with six oxygen atoms from three TTA ligands and two phenolic oxygen atoms from the second ligand Salen,forming a distorted square antiprism.The Zn~(2+) ion is five coordinated with two nitrogen atoms and two phenolic oxygen atoms of Salen ligand and one water molecule,the coordination geometry of Zn~(2+) is a distored square pyramid.The complex Eu(TTA)_(3)Zn(Salen)·H_(2)O shows enhanced emission quantum yield(18.0 %) compared with Eu(TTA)_(3)·2H_(2)O(12.5 %),which indicates that the second ligand Zn(Salen)·H_(2)O has strong antenna effect to the intense red emission of Eu~(3+) ion.