4-(2-吡啶偶氮)-间苯二酚的共振散射光谱研究  

Resonance Light Scattering of 4-(2-Pyridylazo)-Resorcinol (PAR)

作　　者：魏永巨[1] 戚秀菊[2] 敦惠娟[1] 王惠英[1] 兰瑞家[1] 

机构地区：[1]河北师范大学化学学院,河北石家庄050016 [2]石家庄师范专科学校化学系,河北石家庄050801

出　　处：《光谱学与光谱分析》2005年第8期1289-1292,共4页Spectroscopy and Spectral Analysis

基　　金：河北省自然科学基金(200153);河北省教育厅博士基金资助项目

摘　　要：研究了4-(2-吡啶偶氮)-间苯二酚(PAR)水溶液的共振散射光谱的形成机理与影响因素. 在弱酸性溶液中, PAR可产生很强的共振光散射, 散射光谱形状与吸收光谱有关. 溶液酸度影响PAR的电离平衡和存在状态, 因而影响散射光谱. 在pH 3.1～6.2之间, PAR为不带电荷的中性分子, 可在疏水力的作用下结合形成分子聚合体, 从而导致共振光散射增强. 光偏振实验表明PAR的散射光为完全偏振光. 在一定实验条件下, 光散射强度与PAR浓度之间存在线性关系.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.

关 键 词：4-(2-吡啶偶氮)-间苯二酚(PAR) 共振光散射 吸收光谱 光偏振 

分 类 号：O657.3[理学—分析化学]