Resonance Light Scattering of 4-(2-Pyridylazo)-Resorcinol (PAR)
WEI Yong-ju1, QI Xiu-ju2, DUN Hui-juan1, WANG Hui-ying1, LAN Rui-jia1
1.College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China 2.Department of Chemistry, Shijiazhuang Normal College, Shijiazhuang 050801, China
Abstract：Mechanism and influence factors of resonance light scattering (RLS) spectra of 4-(2-pyridylazo)-resorcinol (PAR) aqueous solution were studied.In weak acidic solutions, strong RLS of PAR can be observed.The spectral feature of RLS is related to the absorption spectra of PAR.Acidity of the solutions influenced the acid-base equilibrium of PAR and its existing state, thereby influenced the RLS intensity.At pH 3.1 to pH 6.2, PAR exists as neutral molecule, which may assemble into molecular aggregates by hydrophobic force giving a light scattering enhancement.By a light polarization experiment, the RLS of PAR was demonstrated to be complete polarized light.The relationship between RLS intensity and PAR concentration was examined to be linear at a given set of experimental conditions.
[1] Pasternack R F, Bustamante C, Collings P J, et al.J.Am.Chem.Soc., 1993, 115: 5393. [2] Pasternack R F, Collings P J.Science, 1995, 269: 935. [3] Huang C Z, Li K A, Tong S Y.Anal.Chem., 1996, 68(13): 2259. [4] Ma C Q, Li K A, Tong S Y.Analyst, 1997, 122(4): 361. [5] WEI Yong-ju, LI Ke-an, TONG Shen-yang(魏永巨，李克安，童沈阳).Acta Chimica Sinica(化学学报), 1998, 56: 290. [6] Zhang S Z, Zhao F L, Li K A et al.Anal.Chim.Acta, 2001, 431(1): 133. [7] LIU Shao-pu，LIU Zhong-fang，LI Ming(刘绍璞，刘忠芳，李 明).Acta Chimica Sinica(化学学报)，1995, 53: 1178. [8] LIU Shao-pu，LIU Zhong-fang(刘绍璞，刘忠芳).Chem.J.Chinese Universities(高等学校化学学报)，1996, 17(6): 887. [9] LI Yuan-fang，HUANG Cheng-zhi，HU Xiao-li(李原芳，黄承志，胡小莉).Chinese J.Anal.Chem.(分析化学), 1998，26(12): 1508. [10] MA Chun-qi, LIU Ying, LI Ke-an, et al(马春琪, 刘 瑛, 李克安, 等).Chinese Science Bulletin(科学通报)，1999, 44(7): 682. [11] WANG Ya-ting, ZHAO Feng-lin, LI Ke-an et al(王亚婷, 赵凤林, 李克安，等).Chem.J.Chinese Universities(高等学校化学学报), 2000, 21(10): 1491. [12] JIANG Zhi-liang，FENG Zhong-wei, LI Ting-sheng, et al(蒋治良，冯忠伟，李廷盛，等).Scince in China (Series B)(中国科学(B辑)), 2001, 31(2): 183. [13] ZENG Yun-e, ZHANG Huan-shan, CHEN Zhen-hua(曾云鹗，张华山，陈振华).Handbook of Modern Chemical Reagents(Series 4) (现代化学试剂手册·第四分册).Beijing: Chemical Engineering Press(北京: 化学工业出版社), 1989.134. [14] WEI Yong-ju, KANG Zhi-min, QI Xiu-ju, MO Li-ping, LIU Cui-ge, ZHOU Qing-ze(魏永巨, 康志敏, 戚秀菊, 默丽萍, 刘翠格, 周清泽).Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2003, 23(1): 115. [15] WEI Yong-ju, KANG Zhi-min, LIU Cui-ge, LAN Rui-jia, WANG Hui-ying(魏永巨，康志敏，刘翠格，兰瑞家，王惠英).Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004，24(12)： 1659. [16] CHEN Guo-zhen, HUANG Xian-zhi, ZHENG Zhu-zi, et al(陈国珍, 黄贤智, 郑朱梓，等).Fluorometric Analysis, 2nd Edn.(荧光分析法·第2版).Beijing: Science Press(北京: 科学出版社), 1990.18.
