CPARH的合成及Ag（Ⅰ）－CPARH络合物的光度性质研究  

Preparation of 5-(2-(4-chlorophenol ) azo)-rhodanine and spectrophotometric characteristics of its complex with silver(Ⅰ)

作　　者：张正奇[1] 曾鸽鸣[1] 周文华 黎艳飞 

机构地区：[1]湖南大学化学化工系

出　　处：《化学试剂》1996年第3期165-167,共3页Chemical Reagents

摘　　要：合成了５－（２－（４－氯苯酚）偶氮）－罗丹宁。在ｐＨ６．９５的ＮＨ４Ａｃ缓冲溶液中，当有０．１８％的ＳＬＳ存在时，Ａｇ（Ⅰ）与ＣＰＡＲＨ形成１：１络合物，λｍａｘ为４８０ｎｍ，ε为１．０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ａｇ（Ⅰ）含量在０．０１１～５．４０μｇ／ｍＬ范围内服从Ｂｅｅｒ定律。所提出的方法用于精铜矿中微量银的测定，相对误差在５．０％以内。CPARH [5- (2- (4-chlorophenol ) az ) -rhodanine] synthesized in this laboratory has been proposed as an analytical reagent. In a pH 6. 95 NH4Ac buffer solution containing 0. 18% SLS, silver(Ⅰ) forms an orange complex with CPARH, the molar absorptivity being 1. 0 ×105 L·mol-1·cm-1 at 480um. Over the range of silver (Ⅰ) concentration from 0. 011 to 5. 40 μg/mL Beer's law is obeyed. The proprosed method can beused to determine trace silver in ore samples.

关 键 词：银离子 络合物 分光光度法 CPARH 偶氮罗丹宁 

分 类 号：O614.122[理学—无机化学] O657.32[理学—化学]