On the Interaction between PVP and Europium Benzenesulfonate
LIU Jun1,2, LIU Shao-xuan2, GAO Yun-long2,3, FAN Xiao-kun2,4, GUAN Yan2, WENG Shi-fu2, YANG Zhan-lan2, XU Yi-zhuang2*, WU Jin-guang2
1. Department of Biochemistry, Wenshan University, Wenshan 663000, China 2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 3. College of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China 4. College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050016, China
Abstract：The interaction between polyvinylpyrrolidone (abbreviated as PVP) and europium benzenesulfonate was investigated by using temperature-dependent FTIR and fluorescence spectra. Europium compounds show strong coordination ability with amide groups of PVP. In order to remove the undesired H—O—H scissoring bands from the adsorbed water in FTIR spectra, temperature-dependent FTIR was utilized to reveal the spectral behavior of amide Ⅰ band after being coordinated with europium ions from europium compounds. As a result, the bond order of the carbonyl groups decreased, leading to a red-shift of amide Ⅰ band in the FTIR spectra. Furthermore, fluorescence spectra demonstrate that the interaction between PVP and europium benzenesulfonate enhanced the solubility of europium benzenesulfonate in chloroform. As a matter of fact, europium benzenesulfonate, which is insoluble in chloroform, becomes soluble in chloroform containing 10 Wt% PVP. In the fluorescence spectrum of europium benzenesulfonate crystals, only the f—f transition peaks of europium ions can be found. However, the emission peak of the π*—π transition of benzenesulfonate group appears in concentrated aqueous solution of europium benzenesulfonate. The phenomenon shows that part of benzenesulfonate undergoes decomplexation from europium benzenesulfonate complex and isolated benzenesulfonate occurs in the aqueous solution. Energy transfer pathway from excited triplet state of benzenesulfonate to europium ions is blocked in isolated benzenesulfonate. As a result, π*—π transition band of benzenesulfonate can be observed in the florescence spectrum. The decomplexation provides larger coordination space around europium ions, which favors the coordination between europium benzenesulfonate and PVP.
刘 俊1,2，刘少轩2，高云龙2,3，范晓坤2,4，关 妍2，翁诗甫2，杨展澜2，徐怡庄2*，吴瑾光2 . 聚乙烯吡咯烷酮与苯磺酸铕相互作用研究 [J]. 光谱学与光谱分析, 2013, 33(06): 1487-1490.
LIU Jun1,2, LIU Shao-xuan2, GAO Yun-long2,3, FAN Xiao-kun2,4, GUAN Yan2, WENG Shi-fu2, YANG Zhan-lan2, XU Yi-zhuang2*, WU Jin-guang2. On the Interaction between PVP and Europium Benzenesulfonate . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(06): 1487-1490.
[1] Yan B, Qiao X F. J. Phys. Chem. B, 2007, 111: 12362. [2] Gao B B, Fang L, Men J Y, et al. Polymer, 2012, 53(21): 4709. [3] Zhang H, Song H W, Yu H Q, et al. J. Phys. Chem. C, 2007, 111(17): 6524. [4] Cai N, Nan C W, Zhai J Y, et al. Appl. Phys. Lett., 2004, 84(18): 3516. [5] Liu S X, Zhang C F, Liu Y H, et al. J. Mol. Struct., 2012, 1021: 63. [6] Xu Y Z, Wu J G, Sun W X, et al. Chem. Eur. J., 2002, 8: 5323. [7] Zhang C F, Liu Y H, Liu S X, et al. Sci. China Ser. B-Chem., 2009, 52(11): 1835. [8] Tao D L, Xu Y Z, Feng J, et al. J. Mater. Chem., 2004, 14：1252. [9] Hao C W, Zhao Y, Zhou Y, et al. J. Polym. Sci. Pt. B-Polym. Phys., 2007, 45: 1589. [10] Wu Y J, Xu Y Z, Waog D J, et al. J. Appl. Polym. Sci., 2004, 91: 2869. [11] Paik S P, Ghatak S K, Dey D, et al. Anal. Chem., 2012, 84: 7555.
