Study on Supramolecular Complexes of Cyclodextrins and Fenoxaprop-p-Ethyl by UV Spectra
ZHANG An-ping1, LUO Fan1, LIU Wei-ping2*
1. Institute of Environmental Science, Zhejiang University, Hangzhou 310029，China 2. Research Center of Green Chirality, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Abstract：The supramolecular complexes of fenoxaprop-p-ethyl and various cyclodextrins (β-CD, HP-β-CD, RAMEB) were studied by UV spectra technique. The results showed that all cyclodextrins could form 1∶1 inclusion complexes with fenoxaprop-p-ethyl in ethanol-water (the volume ratio of ethanol to water was 1∶4), and the binding constants of the three types of cyclodextrins toward fenoxaprop-p-ethyl were in the order of KRAMEB>>KHP-β-CD＞Kβ-CD. Between 298.15 and 318.15 K, the binding constants decreased with temperature increasing. The Gibbs free energy ΔG, enthalpy change ΔH, and entropy change ΔS determined were all negative, suggesting that the inclusion complexation is exothermic and can spontaneously occur by the balance of enthalpy driving and entropy opposing.
张安平1,罗凡1,刘维屏2* . 紫外光谱法研究环糊精/精噁唑禾草灵超分子复合体[J]. 光谱学与光谱分析, 2006, 26(12): 2298-2301.
ZHANG An-ping1, LUO Fan1, LIU Wei-ping2* . Study on Supramolecular Complexes of Cyclodextrins and Fenoxaprop-p-Ethyl by UV Spectra . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(12): 2298-2301.
[1] Lehn J M. Supramolecular Chemistry, Concepts and Perspectives. Weinhein: Wiley-VCH, 1995. 101. [2] TONG Lin-hui(童林荟). Chemistry of Cyclodextrin—Base and Application(环糊精化学——基础与应用). Beijing: Science Press(北京：科学出版社), 2001. 135. [3] Szejtli J. Starch-Strke, 1985, 37(11): 382. [4] Institute for the Control of Agrochemicals, Ministry of Agriculture(ICAMA), the People’s Republic of China(中国农业部农药检定所). A New Pesticide Manual (Continuation) (新编农药手册(续集)). Beijing: Chinese Agriculture Press(北京：中国农业出版社), 1998. 386. [5] Szejtli J. Chem. Rev., 1998, 98(5): 1743. [6] Konishi T, Sasaki Y. Proceeding of National Academic Science(PNAS), 1994, 91(9): 3598. [7] Trenkamp S, Martin W, Tietjen K. PNAS, 2004, 101(32): 11903. [8] Busch K W, Swamidoss I M, Fakayode S O, et al. J. Am. Chem. Soc., 2003, 125(7): 1690. [9] FENG Guang-zhu, LU Kui, LI He-ping(冯光炷, 卢 奎, 李和平). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004, 24(9): 1099. [10] XU Hao, CHEN Liang(续 浩, 陈 亮). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2002, 22(2): 292. [11] XIE Wen-lei, XU Wei-he, FENG Guang-zhu(谢文磊, 徐卫河, 冯光炷). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2001, 21(5): 707. [12] WANG Luo-xin, Lü Jun, DU Zong-liang, et al(王罗新，吕 军，杜宗良, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004, 24(2): 183. [13] LI Jun-fen, XU Zhi-cheng, DONG Chuan(李俊芬，许志成，董 川). Journal of Analytical Science(分析科学学报), 2004, 20(3): 229.
