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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．
In this paper, the synthesis, purification, structural characterization of four new azo rhodanines and their color reaction with palladium (Ⅱ) in the presence of TritonX-100 were reported. The four new reagents are 5- (p-tolyl azo) -rhodanine (Ⅰ), 5- (o-chloronitrophenyl azo) -rhodanine (Ⅱ) Nitrophenylazo) -rhodanine (III) and 5- (4-sulfamoylphenylazo) -rhodanine (IV). Experiments show that the above reagents can form stable complexes with palladium (Ⅱ) under suitable pH. The maximum absorption wavelength is about 530 nm and the Δλ is greater than 70 nm. The apparent molar absorptivity is more than 2.0 × 104L · mol-1cm. The method has been used to determine the palladium in the catalyst with satisfactory results.