4-(2-QUINOLYLAZO)-1, 3-DIHYDROXY-NAPHTHALENE——A NEW SENSITIVE ANALYTICAL REAGENT FOR TRACE COPPER DETERMINATION  

作　　者：张正奇 俞汝勤 

机构地区：[1]Department of Chemistry and Chemical Engineering, Hunan University, Changsha

出　　处：《Science China Chemistry》1989年第3期278-292,共15页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China

摘　　要：The azo compound 4-(2-quinolylazo)-1,3-dihydroxynaphthalene (2-QADNm) has been synthesized and used as a new sensitive spectrophotometric and electroanalytical reagent for determination of trace amounts of copper. In dilute alkaline solutions, 2-QADNm shows a single-sweep polarographic wave at -0.95 V (vs. SCE). In the presence of copper(Ⅱ) two new waves appear at -0.52 and -0.79 V. Using the wave at-0.79 V, a trace amount of copper down to 10^(-8) mol/L can be determined. The electroanalytical characteristics of 2-QADNm and the electrochemical reaction mechanism of the copper(Ⅱ)-2-QADNm complex have been studied in detail by the use of various electrochemical techniques. In alkaline solutions, 2-QADNm forms red complex with copper(Ⅱ) which has an absorption peak at 526 nm, the molar absorptivity being 6.4×10~4 1·mol^(-1)·cm^(-1). In the presence of a non-ionic surfactant the molar absorptivity of this complex is 1.6×10~5 1·mol^(-1)·cm^(-1).The azo compound 4-（2-quinolylazo）-1,3-dihydroxynaphthalene （2-QADNm） has been synthesized and used as a new sensitive spectrophotometric and electroanalytical reagent for determination of trace amounts of copper. In dilute alkaline solutions, 2-QADNm shows a single-sweep polarographic wave at -0.95 V （vs. SCE）. In the presence of copper（Ⅱ） two new waves appear at -0.52 and -0.79 V. Using the wave at-0.79 V, a trace amount of copper down to 10^-8 mol/L can be determined. The electroanalytical characteristics of 2-QADNm and the electrochemical reaction mechanism of the copper（Ⅱ）-2-QADNm complex have been studied in detail by the use of various electrochemical techniques. In alkaline solutions, 2-QADNm forms red complex with copper（Ⅱ） which has an absorption peak at 526 nm, the molar absorptivity being 6.4×10⁴ 1·mol^-1·cm^-1. In the presence of a non-ionic surfactant the molar absorptivity of this complex is 1.6×10⁵ 1·mol^-1·cm^-1.

关 键 词：quinolylazonaphthalenediol copper assay organic ANALYTICAL REAGENT POLAROGRAPHY photometry. 

分 类 号：O6[理学—化学]