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用变温红外光谱法和荧光光谱法研究了聚乙烯吡咯烷酮与苯磺酸铕的相互作用。聚乙烯吡咯烷酮的酰胺基团可与苯磺酸铕中的铕离子发生络合配位作用,导致聚乙烯吡咯烷酮的酰胺Ⅰ带发生红移。这种络合配位作用,使原本不溶于氯仿的苯磺酸铕可溶于含聚乙烯吡咯烷酮的氯仿溶液。在苯磺酸铕固体的发射光谱中,只能观察到铕离子的f—f跃迁特征发射峰,而在苯磺酸铕浓水溶液的荧光光谱中,亦可观测到苯磺酸根的π*→π跃迁峰,说明苯磺酸铕在水溶液中存在解络合现象。苯磺酸铕在溶液中的解络合行为使铕离子周围的可配位空间增大,这为PVP的酰胺基团与铕离子发生络合配位作用创造了条件。
The interaction between polyvinylpyrrolidone and europium (benzenesulfonate) was studied by means of infrared spectroscopy and fluorescence spectroscopy. The amide group of polyvinylpyrrolidone complexed with the europium ions in europium benzene sulfonate, resulting in the red shift of the amide Ⅰ band of polyvinylpyrrolidone. This complexation coordination, so that was not soluble in chloroform, europium benzene sulfonate soluble in polyvinylpyrrolidone containing chloroform solution. In the emission spectrum of europium benzene sulfonate, only the emission peak of f-f transition of europium ion can be observed. In the fluorescence spectrum of europium benzoate aqueous solution, π * of benzenesulfonate can also be observed π transition peak, indicating the presence of europium benzenesulfonate in aqueous solution complexation phenomenon. The complexation behavior of europium benzenesulfonate in solution increased the coordination space around the europium ion, which provided the conditions for the complexation and coordination between the amide group of PVP and the europium ion.