四种新偶氮罗丹宁类显色剂的合成及其与钯(Ⅱ)显色反应的研究  

Synthese of Four New Azorhodanine and Their Color Reactions with Pauadium(Ⅱ)

作　　者：孙兴华 王磊 任泽云 袁系林 

出　　处：《淮北煤师院学报（自然科学版）》1997年第2期37-42,共6页Journal of Huaibei Teachers College(Natural Sciences Edition)

摘　　要：本文报导了四种新偶氮罗丹宁类显色剂的合成、纯化、结构表征以及四种新试剂在TritonX－100存在下与钯（Ⅱ）的显色反应．四种新试剂分别为5—（对甲苯基偶氮）—罗丹宁（Ⅰ）、5—（邻氯对硝基苯基偶氮）—罗丹宁（Ⅱ）、5—（2，4—二硝基苯基偶氮）—罗丹宁（Ⅲ）和5—（4—氨磺酰基苯基偶氮）—罗丹宁（IV）．实验表明，上述试剂在合适的pH下均可与钯（Ⅱ）形成稳定的配合物，最大吸收波长位于530nm左右，Δλ大于70nm。表观摩尔吸光系数大于2．0×104L·mol-1cm，方法曾用于催化剂中钯的测定，结果满意．This paper deals with the syntheses purification and characterization of four new azorhodanine and their color reactions with pauadium (Ⅱ) in the presence of nonioinc surfactant Triton X-100.The four new reagents are 5-(4-methylbenzeneazo)-rhodanine (Ⅰ),5-(2-chloro-4 nitrobenzeneazo)-rhodanine (Ⅱ),5-(2,4-dritrobenzeneazo)-rhodanine (Ⅲ) and 5-(4 suefamoylbenzeneazo)-rhodanine (Ⅳ).The results show that the new reagents react with pauadum (Ⅱ) to form red complexes with a molar ratio of 2:1 at optimum acidity of salution.The maxiuum wavelength of complexes are about at 500nm and Molar absorptivity are found to be about 2.0×104Lmol-1'cm-1 .Beers law are obeyed in the range of 0-50μg Pd(Ⅱ) per 25ml of solution.The method has been applied to determination of pauadium in catalysts with satisfactory results.

关 键 词：偶氮罗丹宁 合成 钯 分光光度法 显色反应 

分 类 号：TQ421.3[化学工程] O614.823[理学—无机化学]