以13种配体分别与十余种稀土离子形成二元配合物,研究其水溶液荧光强度,结果发现,只有Tb3+和Eu3+有较强荧光,Dy3+和Sm3+只有非常弱的荧光,而其它稀土离子不发光.荧光强度顺序除配体DPA为Eu3+＞Tb3+＞Dy3+＞Sm3+外,其余配体的荧光强度顺序为Tb3+＞Eu3+＞Dy3+＞Sm3+.以数种4-位取代吡啶-2,6-二甲酸衍生物为配体,与Tb3+形成二元配合物体系,研究了pH值、溶剂等因素对体系荧光强度的影响,测定了pH近中性情况下配合物体系的激发与发射光谱及发光寿命等;研究了4-位不同取代基对体系发光性能的影响.结果表明:①当pH值近中性时体系的发光性能最好;②4-位上不同取代基对体系的发光性能也有较大的影响,一般地说,取代基为供电子基团时,体系的发光性能要优于取代基为吸电子基团的发光体系;③溶剂效应对体系的发光性能影响较大,其中低极性溶剂对体系的发光性能要优于高极性溶剂.我们发现,其中4-异丙氧基吡啶-2,6-二甲酸、4-乙酰氨基吡啶-2,6-二甲酸和3-乙酰氨基吡啶-2,6-二甲酸为Tb3+的理想敏化剂.
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