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本文着重研究了有非离子型表面活性剂(平平加)存在时硫氰酸根和钴络离子的显色反应的机理。研究表明,平平加类似冠醚,能与钾离子螯合生成大阳离子,进而与硫氰酸根和钴络离子生成缔合物。缔合物的组成经测定可认为是(n-SfK~+)·Co(SCN)_3~-。红外光谱也证实缔合物的存在。由此说明,对于硫氰酸根的金属络离子,非离子型表面活性剂的影响可以用“阳离子螯合机理”来论证,这为非离子型表面活性剂的增敏作用提供了一个新论点。
This article focuses on the mechanism of the color reaction of thiocyanate and cobalt complex ions in the presence of non-ionic surfactants (equimolar amounts). Studies have shown that even the level of similar crown ethers, with potassium ions chelate generation of large cations, and then with thiocyanate and cobalt complex ions to generate associates. The composition of the associate is determined to be (n-SfK ~ +) · Co (SCN) _3 ~ -. Infrared spectroscopy also confirmed the presence of associate. Thus, the influence of the nonionic surfactant on the thiocyanate metal ion can be demonstrated by the “cationic chelation mechanism”, which provides a new argument for the sensitization of the nonionic surfactant.