Mn^(2+)与聚N-异丙基丙烯酰胺相互作用的光谱研究

Spectra Studies on the Interaction of Mn^(2+) and Poly N-Isopropylacrylamide

合成了聚N-异丙基丙烯酰胺(PNIPAAm)与Mn2+的配合物,并用荧光光谱、紫外-可见光谱及FTIR进行了初步表征。光谱数据说明Mn2+与PNIPAAm羰基氧发生了配位键合作用。由于Mn2+的发射光谱与PNIPAAm激发光谱部分重叠及Mn2+位于561 nm的发射峰在Mn2+-PNIPAAm体系发射光谱中消失,说明发生了较好的F rster能量传递。Mn2+-PNIPAAm配合物体系在307 nm紫外区荧光强度比PNIPAAm增强了314%。

The interaction of Mn^2＋ and poly （N-isopropylacrylamide） （PNIPAAm） was studied by using UV-Vis, FTIR and fluorescence spectroscopic methods. The results indicated that Mn^2＋ could be bonded to oxygen atoms of carbonyl in PNIPAAm and form the complex of Mn^2＋ -PNIPAAm. It was found that there existed efficient Foerster energy transfer from Mn^2＋ to PNIPAAm due to the emission spectra of Mn^2＋ overlapping the excitation spectra of PNIPAAm and that the emission peak of Mn^2＋ at 561 nm disappeared in Mn^3＋ -PNIPAAm complex. Therefore the fluorescence intensity at 307 nm was increased by 314 %.