【摘要】 在乙腈介质中,除水剂原甲酸三乙酯存在下,合成了以Eu(Ⅲ),Eu(Ⅲ) La(Ⅲ),Eu(Ⅲ) Gd(Ⅲ)为中心,以冠醚(18 C 6)及对苯二甲酸为配体的同核铕及其铕 镧、铕 钆异核稀土配合物,并对其进行了元素分析、红外光谱分析及荧光性能的测定和研究。发现空腔较大的18 C 6不仅可以与半径大的La3+离子配位,还可以与半径小的Eu3+和Gd3+离子配位。非荧光的La(Ⅲ),Gd(Ⅲ)对Eu(Ⅲ)的发光有较强的敏化作用,桥联配体对苯二甲酸根可有效地传送能量。与大多数铕配合物不同,所研究的配合物的5D0→7F0跃迁强度非常高。更多还原

【Abstract】 The same and different binuclear rare earth complexes of Eu（Ⅲ）-Eu（Ⅲ）, Eu（Ⅲ）-La（Ⅲ） and Eu（Ⅲ）-Gd（Ⅲ） with crown ether （18C6） and p-phthalic acid were synthesized in acetonitrile. The compositions are found to be Eu₂L₂L′（ClO₄）₄·6H₂O, EuLaL₂L′（ClO₄）₄·6H₂O and EuGdL₂L′（ClO₄）₄·6H₂O （L=18C6, L′=p-phthalate）, respectively. The IR absorption spectra and fluorescence spectra were studied. The results show that not only the crown ether with diameter 260～320 pm can coordinate to La³⁺ ion which radius is bigger, but also can coordinate to Eu³⁺ and Gd³⁺ ions whose radii are smaller. The emission intensity of Eu³⁺ ion is greatly enhanced by La³⁺ and Gd³⁺ ions in the complexes. p-phthalate transfers the absorbing energy of lanthanum and gadolinium complexes in a more effective way. There is a difference from ordinary europium complexes in which the fluorescence emission intensity of （（）⁵D₀）-（（）⁷F₀） is very weak, but it is stronger in the title complexes.更多还原